{"id":6382,"date":"2026-08-14T14:52:33","date_gmt":"2026-08-14T06:52:33","guid":{"rendered":"https:\/\/www.mywaytool.com\/?p=6382"},"modified":"2026-08-14T14:54:16","modified_gmt":"2026-08-14T06:54:16","slug":"fastener-knowledge-bolt-nutscrew","status":"publish","type":"post","link":"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/14\/fastener-knowledge-bolt-nutscrew\/","title":{"rendered":"Fastener Knowledge (Bolt, Nut,Screw)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"6382\" class=\"elementor elementor-6382\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-efa545a e-con-full e-flex e-con e-parent\" data-id=\"efa545a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-491f9b37 elementor-widget elementor-widget-breadcrumbs\" data-id=\"491f9b37\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"breadcrumbs.default\">\n\t\t\t\t\t<p id=\"breadcrumbs\"><span><span><a href=\"https:\/\/www.myway-metal.com\/\">Home<\/a><\/span><\/span><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7a47b4a8 e-con-full e-flex e-con e-parent\" data-id=\"7a47b4a8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-3c65a433 e-con-full e-flex e-con e-child\" data-id=\"3c65a433\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-21e4d10a e-con-full e-flex e-con e-child\" data-id=\"21e4d10a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-38aa2500 elementor-grid-1 elementor-posts--thumbnail-none elementor-grid-tablet-2 elementor-grid-mobile-1 elementor-widget elementor-widget-posts\" data-id=\"38aa2500\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;classic_columns&quot;:&quot;1&quot;,&quot;classic_columns_tablet&quot;:&quot;2&quot;,&quot;classic_columns_mobile&quot;:&quot;1&quot;,&quot;classic_row_gap&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:35,&quot;sizes&quot;:[]},&quot;classic_row_gap_laptop&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;classic_row_gap_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;classic_row_gap_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"posts.classic\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-posts-container elementor-posts elementor-posts--skin-classic elementor-grid\" role=\"list\">\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-7135 post type-post status-publish format-standard has-post-thumbnail hentry category-fastener\" role=\"listitem\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/reuse-of-fasteners-a-sustainable-solution-in-modern-construction\/\" >\n\t\t\t\tReuse of Fasteners: A Sustainable Solution in Modern Construction\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Reusing fasteners is a practical and sustainable solution to reduce construction waste and environmental impact. As challenges exist in different\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/reuse-of-fasteners-a-sustainable-solution-in-modern-construction\/\" aria-label=\"Read more about Reuse of Fasteners: A Sustainable Solution in Modern Construction\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-7126 post type-post status-publish format-standard has-post-thumbnail hentry category-fastener\" role=\"listitem\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/the-hidden-threat-of-fastener-fatigue\/\" >\n\t\t\t\tThe Hidden Threat of Fastener Fatigue\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Fastener fatigue is a phenomenon that occurs when a fastener undergoes repeated cycles of stress over time which is common\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/the-hidden-threat-of-fastener-fatigue\/\" aria-label=\"Read more about The Hidden Threat of Fastener Fatigue\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-7117 post type-post status-publish format-standard has-post-thumbnail hentry category-fastener\" role=\"listitem\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/dangers-of-fastener-embrittlement\/\" >\n\t\t\t\tDangers of Fastener Embrittlement\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>Understanding the threats that can risk the integrity of components in structures such as fastener embrittlement can lead to preventing\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/dangers-of-fastener-embrittlement\/\" aria-label=\"Read more about Dangers of Fastener Embrittlement\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-7108 post type-post status-publish format-standard has-post-thumbnail hentry category-fastener\" role=\"listitem\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/the-future-of-smart-fasteners\/\" >\n\t\t\t\tThe Future of Smart Fasteners\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>The future of using smart fasteners in manufacturing, construction, and other industries has a bright potential to enhance the functionality\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/the-future-of-smart-fasteners\/\" aria-label=\"Read more about The Future of Smart Fasteners\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-7099 post type-post status-publish format-standard has-post-thumbnail hentry category-fastener\" role=\"listitem\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/high-performance-fasteners-for-aerospace\/\" >\n\t\t\t\tHigh-Performance Fasteners for Aerospace\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>As technology advances and materials continue to evolve, the aerospace industry rely on innovative fastener solutions to meet the growing\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/high-performance-fasteners-for-aerospace\/\" aria-label=\"Read more about High-Performance Fasteners for Aerospace\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<article class=\"elementor-post elementor-grid-item post-7090 post type-post status-publish format-standard has-post-thumbnail hentry category-uncategorized\" role=\"listitem\">\n\t\t\t\t<div class=\"elementor-post__text\">\n\t\t\t\t<h3 class=\"elementor-post__title\">\n\t\t\t<a href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/fastener-testing-and-quality-control\/\" >\n\t\t\t\tFastener Testing and Quality Control\t\t\t<\/a>\n\t\t<\/h3>\n\t\t\t\t<div class=\"elementor-post__excerpt\">\n\t\t\t<p>For some applications that require intricate and reliable fastener devices like automotive, aerospace, and construction, safety is a paramount detail\t\t<\/div>\n\t\t\n\t\t<a class=\"elementor-post__read-more\" href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/fastener-testing-and-quality-control\/\" aria-label=\"Read more about Fastener Testing and Quality Control\" tabindex=\"-1\" >\n\t\t\tRead More \u00bb\t\t<\/a>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/article>\n\t\t\t\t<\/div>\n\t\t\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a394654 elementor-button-align-stretch elementor-widget elementor-widget-form\" data-id=\"7a394654\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;step_next_label&quot;:&quot;Next&quot;,&quot;step_previous_label&quot;:&quot;Previous&quot;,&quot;button_width&quot;:&quot;100&quot;,&quot;step_type&quot;:&quot;number_text&quot;,&quot;step_icon_shape&quot;:&quot;circle&quot;}\" data-widget_type=\"form.default\">\n\t\t\t\t\t\t\t<form class=\"elementor-form\" method=\"post\" name=\"New Form\" aria-label=\"New 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elementor-field-required\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"email\" name=\"form_fields[email]\" id=\"form-field-email\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Email*\" required=\"required\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-text elementor-field-group elementor-column elementor-field-group-field_4c853c9 elementor-col-100 elementor-field-required\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<input size=\"1\" type=\"text\" name=\"form_fields[field_4c853c9]\" id=\"form-field-field_4c853c9\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"Company*\" required=\"required\">\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-tel elementor-field-group elementor-column elementor-field-group-field_4e2b07a elementor-col-100\">\n\t\t\t\t\t\t\t<input size=\"1\" type=\"tel\" name=\"form_fields[field_4e2b07a]\" id=\"form-field-field_4e2b07a\" class=\"elementor-field elementor-size-sm  elementor-field-textual\" placeholder=\"WhatsApp\/Tel\" pattern=\"[0-9()#&amp;+*-=.]+\" title=\"Only numbers and phone characters (#, -, *, etc) are accepted.\">\n\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-type-textarea elementor-field-group elementor-column elementor-field-group-message elementor-col-100 elementor-field-required\">\n\t\t\t\t\t<textarea class=\"elementor-field-textual elementor-field  elementor-size-sm\" name=\"form_fields[message]\" id=\"form-field-message\" rows=\"4\" placeholder=\"Message*\" required=\"required\"><\/textarea>\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<div class=\"elementor-field-group elementor-column elementor-field-type-submit elementor-col-100 e-form__buttons\">\n\t\t\t\t\t<button class=\"elementor-button elementor-size-sm\" type=\"submit\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Send<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/button>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/form>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-67344ba3 e-con-full e-flex e-con e-child\" data-id=\"67344ba3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-42a2f450 elementor-widget elementor-widget-heading\" data-id=\"42a2f450\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Fastener Knowledge (Bolt, Nut,Screw)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fbb06dc elementor-widget elementor-widget-text-editor\" data-id=\"fbb06dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Fasteners include: bolts, studs, screws, nuts, washers, pins Fasteners are also called standard parts on the market. It is a kind of mechanical parts used for fastening and connection, and it has a wide range of applications. The characteristics of fasteners: There are many varieties and specifications, different performances and uses, and the degree of standardization, serialization and generalization is extremely high. Therefore, some people call a type of fasteners that have national (industry) standards as standard fasteners, or standard parts for short.<\/p><p>\u00a0<\/p><p>Because the specifications, dimensions, tolerances, weight, performance, surface conditions, marking methods of each specific fastener product, as well as the specific requirements for acceptance inspection, marking and packaging, are separately stipulated in several national (industry) standards , Such as the British system, the German system and the American system. Fasteners are the most widely used mechanical basic parts. With my country&#8217;s accession to the WTO in 2001, it has entered the ranks of major international trading nations. my country&#8217;s fastener products are exported to various countries in the world, and fastener products from all over the world are also pouring into the Chinese market. Fasteners, as one of the products with a large import and export volume in my country, are in line with international standards. It is of great significance to promote Chinese fastener companies to the world and to promote the full participation of fastener companies in international cooperation and competition. Strategic significance.<\/p><p>\u00a0<\/p><p>Fasteners are a general term for a type of mechanical parts used when two or more parts (or components) are fastened and connected into a whole. Also called standard parts on the market.<\/p><p>\u00a0<\/p><p>It usually includes the following 12 types of parts:<\/p><p>1. Bolt: A type of fastener consisting of two parts, a head and a screw (cylinder with external threads), which need to be matched with a nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.<\/p><p>2. Stud: There is no head, only a type of fastener with threads on both ends. When connecting, one end of it must be screwed into the part with internal threaded hole, the other end must pass through the part with through hole, and then the nut is screwed on, even if the two parts are tightly connected as a whole. This type of connection is called a stud connection, which is also a detachable connection. It is mainly used where one of the connected parts has a large thickness, requires a compact structure, or is not suitable for bolt connection due to frequent disassembly.<\/p><p>3. Screw: It is also a type of fastener composed of two parts: head and screw. According to the purpose, it can be divided into three categories: machine screws, set screws and special purpose screws. Machine screws are mainly used for a tightening connection between a part with a threaded hole and a part with a through hole, without the need for a nut to fit (this type of connection is called a screw connection, which is also a detachable connection; it can also be Cooperate with the nut, used for the fastening connection between two parts with through holes.) The set screw is mainly used to fix the relative position between the two parts. Special purpose screws such as eyebolts are used for lifting parts.<\/p><p>4. Nut: With internal threaded holes, the shape is generally flat hexagonal column, and also flat square column or flat cylinder. It is used with bolts, studs or machine screws to fasten and connect two parts. It becomes a whole.<\/p><p>5. Self-tapping screws: similar to machine screws, but the thread on the screw is a special self-tapping screw thread. It is used to fasten and connect two thin metal components into one piece. Small holes need to be made in the component in advance. Because this kind of screw has high hardness, it can be directly screwed into the hole of the component. Form a responsive internal thread. This type of connection is also a detachable connection.<\/p><p>6. Wood screw: It is also similar to machine screw, but the thread on the screw is a special rib for wood screw, which can be directly screwed into the wooden component (or part) to use a metal (or non-metal) with a through hole. The parts are firmly connected to a wooden component. This connection is also a detachable connection. 7. Washer: A type of fastener with an oblate ring shape. It is placed between the supporting surface of bolts, screws or nuts and the surface of the connected parts, which increases the contact surface area of the connected parts, reduces the pressure per unit area and protects the surface of the connected parts from damage; another type of elastic washer, It can also play a role in preventing the nut from loosening.<\/p><p>8. Retaining ring: It is installed in the shaft groove or hole groove of the machine and equipment, and prevents the parts on the shaft or hole from moving left and right.<\/p><p>9. Pins: Mainly used for positioning parts, and some are also used for connecting parts, fixing parts, transmitting power or locking other fasteners.<\/p><p>10. Rivet: A type of fastener consisting of two parts, a head and a nail shaft, used to fasten and connect two parts (or components) with through holes to make them into a whole. This type of connection is called rivet connection, or riveting for short. Belong to and non-detachable connection. Because to separate the two parts connected together, the rivets on the parts must be broken.<\/p><p>11. Assembled parts and connection pairs: Assembled parts refer to a type of fasteners supplied in combination, such as a combination of machine screws (or bolts, self-supplied screws) and flat washers (or spring washers, lock washers); connection; The secondary refers to a type of fastener supplied by a combination of a certain special bolt, nut and washer, such as a high-strength large hexagonal head bolt connection pair for steel structures.<\/p><p>12. Welding nails: Because of the heterogeneous fasteners composed of light energy and nail heads (or no nail heads), they are fixedly connected to a part (or component) by welding so as to be connected with other parts.<\/p><p>\u00a0<\/p><p>Each fastener product must involve some standards in several aspects: 1) Fastener product size standards: specify the content of the basic size of the product; for threaded products, it also includes the basic size of the thread, thread end, shoulder distance, undercut and chamfer, and the end of external threaded parts Dimensions and other aspects.<\/p><p>2) Standards for the technical conditions of fastener products. Specifically, it includes the following standards:<\/p><p>a) Fastener product tolerance standards: specify product size tolerances and geometric tolerances.<\/p><p>b) Mechanical performance standards of fastener products: specify the marking method of product mechanical performance levels and the content of mechanical performance items and requirements; some fastener products will change this content to product material performance or work performance Aspect content.<\/p><p>c) Standards for surface defects of fastener products: specify the types and specific requirements of product surface defects.<\/p><p>d) Surface treatment standards of fastener products: specify the types of product surface treatments and specific requirements.<\/p><p>e) Fastener product test standards: specify the test contents of the various performance requirements mentioned above.<\/p><p>3) Fastener product acceptance inspection, marking and packaging standards: specify the qualified quality level and sampling plan of the random inspection items during the factory acceptance of the product, as well as the content of the product marking method and packaging requirements.<\/p><p>4) Standards on the marking method of fastener products: specify the complete marking method and simplified marking method of the product.<\/p><p>5) Other standards of fasteners: such as the standard of fastener terminology, the standard of fastener product weight, etc.<\/p><p>\u00a0<\/p><p>Standard (German standard and American standard are commonly used)<\/p><p>GB (National Standard)<\/p><p>ISO (International Standard)<\/p><p>DIN (German system)<\/p><p>JIS (Japanese standard)<\/p><p>ANSI \/ASME (American National Standards Institute-ANSI; American Society Of Mechanical Engineers-ASME) (American Standard)<\/p><p>BS (Inch) IFI =Industrial Fastener Institute is the standard of the American Industrial Fastener Association. BA (Inch)<\/p><p>\u00a0<\/p><p>Thread<\/p><p>M. MF (Metric Tooth)<\/p><p>UNC. (American Coarse Tooth)<\/p><p>UNF (American fine teeth)<\/p><p>UNEF (U.S. ultra-fine teeth)<\/p><p>B.S.W. Standard Wyeth Coarse Thread Series, General Purpose Cylindrical Thread (Inch Thread)<\/p><p>B.S.F. standard Wyeth fine pitch series, general purpose<\/p><p>Cylindrical thread (inch thread)<\/p><p>Fine pitch thread full thread<\/p><p>\u00a0<\/p><p>Screw head type<\/p><p>IHH=ind hex head saw hex head<\/p><p>PH=phillips cross groove<\/p><p>Pan round head (pan head)<\/p><p>Oval half countersunk head<\/p><p>H.W.H.. Hexagonal small flange<\/p><p>H.W.F. Hexagon Large Flange<\/p><p>CSK Salad Head (Sink Head)<\/p><p>Large wafer<\/p><p>Bugle horn<\/p><p>Truss pan head with cushion<\/p><p>Pozi metric trough Serra-tion under the cushion with flowers<\/p><p>Flower Head Flower Head<\/p><p>6-bobes recess<\/p><p>Cup head<\/p><p>\u00a0<\/p><p>Common fastener names<\/p><p>split washer spring washer (generally manufacturers will call washer &#8220;washer&#8221;)<\/p><p>flat washer<\/p><p>Self tapping screw<\/p><p>Self drilling screw<\/p><p>drywall screw drywall screw\/drywall screw\/wall screw<\/p><p>high low screw<\/p><p>collated screw<\/p><p>Concrete screw<\/p><p>Tri-lobular thread screw<\/p><p>kep nut<\/p><p>acorn nut stainless steel screw wire<\/p><p>wing washer<\/p><p>eye bolt eye bolt (also called eye bolt, in fact, this is called a lot, probably because of different regions)<\/p><p>Piston bolt<\/p><p>Winding bolt<\/p><p>Hexagon head bolts<\/p><p>Hexagon flange bolts<\/p><p>Hexagon flange bolts<\/p><p>Carriage bolt Carriage bolt Square head bolt<\/p><p>Flat countersink square neck bolts<\/p><p>Flat counter sunk nib bolts<\/p><p>Cross recessed pan head tapping screws<\/p><p>(If you see # 2 or # 20, etc. on the drawing, it means that the head of the screw is suitable for a No. 2 or No. 20 screwdriver)<\/p><p>\u00a0<\/p><p>Surface treatment<\/p><p>BO=black oxide oxidation blackening (if only black is marked, it means that it is dyed black)<\/p><p>Zinc plated<\/p><p>cementation<\/p><p>Nylon patch is resistant to falling (when I first saw it, it was a literal translation of &#8220;nylon sheet&#8221;. When it was shown to the manager, the manager looked at the drawing for a long time and told me that you should check the English of resistant to falling, sure enough&#8212; )<\/p><p>\u00a0<\/p><p>\u00a0<\/p><p>Raw material: Raw material<\/p><p>Spheroidizing annealing: Annealing<\/p><p>Cold drawing: Drawing<\/p><p>Cold heading: Forming<\/p><p>Machining: Machining<\/p><p>Thread forming: Roll Threading<\/p><p>Heat treatment: heat-treatment<\/p><p>Surface treatment: finish<\/p><p>ehydrogenation: Lustrating hydrogen<\/p><p>Inspection: Inspection<\/p><p>\u00a0<\/p><p>Customs code<\/p><p>73181500 bolt<\/p><p>73181600 nut<\/p><p>73182100 Washer<\/p><p>73181100 square head screw<\/p><p>73182300 Rivet<\/p><p>73181400 Self-tapping screws<\/p><p>73182400 Pin and open tail pin<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-154fda86 elementor-widget elementor-widget-image\" data-id=\"154fda86\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"420\" height=\"314\" src=\"https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p20240722101351ce622.webp\" class=\"attachment-large size-large wp-image-6133\" alt=\"Decarburization and carburization\" srcset=\"https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p20240722101351ce622.webp 420w, https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p20240722101351ce622-300x224.webp 300w\" sizes=\"(max-width: 420px) 100vw, 420px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4599bd40 elementor-widget elementor-widget-text-editor\" data-id=\"4599bd40\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>2. Hardness and Strength<\/h2><p>In the inspection of threaded fasteners, we cannot simply look up the hardness value in the relevant manual and convert it into a strength value. There is an influence of hardenability factor. Because GB3098.1 and GB3098.3 stipulate that the arbitration hardness is measured at the 1\/2 radius of the cross section of the part. The tensile test specimen is also cut from the 1\/2 radius. Because it is not ruled out that the center part of the part has a low hardness and low strength part.<\/p><p>Generally speaking, the material has good hardenability and the hardness can be evenly distributed on the cross section of the screw. As long as the hardness is qualified, the strength and guaranteed stress can also meet the requirements. However, when the hardenability of the material is poor, although the hardness is qualified according to the specified parts inspection, the strength and guaranteed stress often do not meet the requirements. Especially when the surface hardness tends to the lower limit.<\/p><p>In order to control the strength and guaranteed stress within the qualified range, the lower limit of hardness is often increased. For example, the hardness control range of grade 8.8: for specifications below M16, it is 26~31HRC, and for specifications above M16, it is appropriate to be 28~34HRC; for grade 10.9, it is appropriate to control it at 36~39HRC. Grades above 10.9 are another matter.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-52a44716 elementor-widget elementor-widget-image\" data-id=\"52a44716\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"500\" height=\"375\" src=\"https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p20240722101716deb21.webp\" class=\"attachment-large size-large wp-image-6134\" alt=\"Hardness and Strength\" srcset=\"https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p20240722101716deb21.webp 500w, https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p20240722101716deb21-300x225.webp 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3ca7bd99 elementor-widget elementor-widget-text-editor\" data-id=\"3ca7bd99\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>3. Re-Tempering Test<\/h2><p>Bolts, screws and studs of grades 8.8 to 12.9 should be re-tempered for 30 minutes at a temperature 10\u00b0C lower than the lowest tempering temperature in actual production. On the same specimen, the difference in the average hardness of three points before and after the test shall not exceed 20HV.<\/p><p>The re-tempering test can check the incorrect operation of using too low a temperature to barely reach the specified hardness range due to insufficient quenching hardness, and ensure the comprehensive mechanical properties of the parts. In particular, threaded fasteners made of low-carbon martensitic steel use low-temperature tempering. Although other mechanical properties can meet the requirements, the residual elongation fluctuates greatly when measuring the guaranteed stress, which is much greater than 12.5um. Moreover, sudden fractures may occur under certain conditions of use. Sudden fractures have occurred in some automotive and construction bolts. The above phenomenon can be reduced when tempering at the lowest tempering temperature. However, special caution should be exercised when making 10.9 grade bolts with low-carbon martensitic steel.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-35a6abd7 elementor-widget elementor-widget-image\" data-id=\"35a6abd7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"517\" height=\"600\" src=\"https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p20240722101819fb25c.webp\" class=\"attachment-large size-large wp-image-6135\" alt=\"Re-tempering test\" srcset=\"https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p20240722101819fb25c.webp 517w, https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p20240722101819fb25c-259x300.webp 259w\" sizes=\"(max-width: 517px) 100vw, 517px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4522643b elementor-widget elementor-widget-text-editor\" data-id=\"4522643b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>4. Hydrogen Embrittlement Inspection<\/h2><p>The sensitivity of hydrogen embrittlement increases with the strength of the fastener. For external threaded fasteners of grade 10.9 and above, surface hardened self-tapping screws, and combination screws with hardened steel washers, etc., dehydrogenation treatment should be carried out after electroplating.<\/p><p>Dehydrogenation treatment is generally carried out in an oven or tempering furnace at 190~230\u2103 for more than 4 hours to diffuse hydrogen.<\/p><p>Threaded fasteners can be tightened on a special fixture until the screw is subjected to a tensile force that satisfies a certain stress, and then maintained for 48 hours. After loosening, the threaded fasteners do not break. This method is used as a hydrogen embrittlement inspection method.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b12df2f elementor-widget elementor-widget-image\" data-id=\"b12df2f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"265\" src=\"https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p2024072210192479ba8.webp\" class=\"attachment-large size-large wp-image-6137\" alt=\"Hydrogen embrittlement inspection\" srcset=\"https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p2024072210192479ba8.webp 400w, https:\/\/www.myway-metal.com\/wp-content\/uploads\/2026\/08\/p2024072210192479ba8-300x199.webp 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1225f76b e-flex e-con-boxed e-con e-parent\" data-id=\"1225f76b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-502067c2 elementor-post-navigation-borders-yes elementor-widget elementor-widget-post-navigation\" data-id=\"502067c2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-navigation.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-post-navigation\" role=\"navigation\" aria-label=\"Post Navigation\">\n\t\t\t<div class=\"elementor-post-navigation__prev elementor-post-navigation__link\">\n\t\t\t\t<a href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/common-challenges-faced-by-the-fastener-industry\/\" rel=\"prev\"><span class=\"post-navigation__arrow-wrapper post-navigation__arrow-prev\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-angle-left\" viewBox=\"0 0 256 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M31.7 239l136-136c9.4-9.4 24.6-9.4 33.9 0l22.6 22.6c9.4 9.4 9.4 24.6 0 33.9L127.9 256l96.4 96.4c9.4 9.4 9.4 24.6 0 33.9L201.7 409c-9.4 9.4-24.6 9.4-33.9 0l-136-136c-9.5-9.4-9.5-24.6-.1-34z\"><\/path><\/svg><span class=\"elementor-screen-only\">Prev<\/span><\/span><span class=\"elementor-post-navigation__link__prev\"><span class=\"post-navigation__prev--label\">Previous<\/span><span class=\"post-navigation__prev--title\">Common Challenges Faced by the Fastener Industry<\/span><\/span><\/a>\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-post-navigation__separator-wrapper\">\n\t\t\t\t\t<div class=\"elementor-post-navigation__separator\"><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"elementor-post-navigation__next elementor-post-navigation__link\">\n\t\t\t\t<a href=\"https:\/\/www.myway-metal.com\/index.php\/2026\/08\/18\/high-performance-fasteners-for-aerospace\/\" rel=\"next\"><span class=\"elementor-post-navigation__link__next\"><span class=\"post-navigation__next--label\">Next<\/span><span class=\"post-navigation__next--title\">High-Performance Fasteners for Aerospace<\/span><\/span><span class=\"post-navigation__arrow-wrapper post-navigation__arrow-next\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-angle-right\" viewBox=\"0 0 256 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z\"><\/path><\/svg><span class=\"elementor-screen-only\">Next<\/span><\/span><\/a>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Fasteners include: bolts, studs, screws, nuts, washers, pins Fasteners are also called standard parts on the market. It is a kind of mechanical parts used for fastening and connection, and it has a wide range of applications. The characteristics of fasteners: There are many varieties and specifications, different performances and uses, and the degree of standardization, serialization and generalization is extremely high. Therefore, some people call a type of fasteners that have national (industry) standards as standard fasteners, or standard parts for short.<\/p>\n","protected":false},"author":1,"featured_media":6387,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-6382","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fastener"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fastener Knowledge (Bolt, Nut,Screw) -<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fastener Knowledge (Bolt, Nut,Screw) -\" \/>\n<meta property=\"og:description\" content=\"Fasteners include: bolts, studs, screws, nuts, washers, pins Fasteners are also called standard parts on the market. It is a kind of mechanical parts used for fastening and connection, and it has a wide range of applications. The characteristics of fasteners: There are many varieties and specifications, different performances and uses, and the degree of standardization, serialization and generalization is extremely high. 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