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Product Information

 

Star washers are an essential component in a wide range of machinery and engineering applications. Typically made from galvanized or zinc-plated steel, these small pieces pack a big punch when it comes to securing bolts and screws in place.
Also known as shakeproof washers or toothed lock washers, star washers feature a series of sharp teeth around the circumference of the washer. When pressed against a nut or bolt head, these teeth bite into the surface, creating a more secure bond that resists loosening due to vibrations or other movement.

The zinc plating on these washers provides a layer of protection against corrosion, ensuring they last longer and remain effective in their application. They also come in various sizes and thicknesses depending on the application, with larger sizes typically used in heavy-duty machinery and smaller sizes used in electrical fittings and household appliances.
In addition to their functional benefits, star washers can also add an aesthetic element to a finished product or project. The unique shape of these washers can be used as a decorative element, adding a touch of visual interest to an otherwise utilitarian design.
When selecting star washers for a project, it’s important to choose the right size and thickness for the job at hand. This can vary significantly depending on the application, and it’s recommended to consult a trusted supplier or engineer for guidance if in doubt.
In conclusion, star washers are an essential component in a wide range of applications, and zinc plating provides an added layer of protection and durability to ensure they function effectively over time. With proper selection and use, these small yet mighty parts can make all the difference in a well-designed and secure finished product.

Flat Washer Dimensions

Flat Washer Dimensions

Table W1
S.A.E. DIMENSIONS FOR HARDENED FLAT WASHERS

Bolts SizeA
O.D.
B
I.D.
C
Thickness
MinMax
1/4″5/89/320.0510.080
5/16″11/1611/320.0510.080
3/8″13/1613/320.0510.080
7/16″59/6415/320.0510.080
1/2″1-1/1617.320.0970.177
5/8″1-5/1611/160.1220.177
3/4″1-15/3213/160.1220.177
7/8″1-3/415/160.1360.177
1″21-1/80.1360.177
1-1/8″2-1/41-1/40.1360.177
1-1/4″2-1/21-3/80.1360.177
1-3/8″2-3/41-1/20.1360.177
1-1/2″31-5/80.1360.177
1-3/4″3-3/81-7/80.1780.28
2″3-3/42-1/80.1780.28
2-1/4″42-3/80.240.34
2-1/2″4-1/22-5/80.240.34
2-3/4″52-7/80.240.34
3″5-1/23-1/80.240.34
3-1/4″63-3/80.240.34
3-1/2″6-1/23-5/80.240.34
3-3/4″73-7/80.240.34
4″7-1/24-1/80.240.34

 

Table W2
USS DIMENSIONS FOR HARDENED FLAT WASHERS

Bolts SizeA
O.D.
B
I.D.
C
Thickness
MinMax
1/4″3/45/160.0510.080
5/16″7/83/80.0640.104
3/8″17/160.0640.104
7/16″1-1/41/20.0640.104
1/2″1-3/89/160.0860.132
9/16″1-1/25/80.0860.132
5/8″1-3/411/160.1080.160
3/4″213/160.1220.177
7/8″2-1/415/160.1360.192
1″2-1/21-1/160.1360.192
1-1/8″2-3/41-1/40.1360.192
1-1/4″31-3/80.1360.192
1-3/8″3-1/41-1/20.1530.213
1-1/2″3-1/21-5/80.1530.213

 

Table W3
S.A.E. DIMENSIONS FOR LOW CARBON FLAT WASHERS

Bolts SizeA
O.D.
B
I.D.
C
Thickness
1/8″3/85/323/64
5/32″7/163/163/64
3/16″1/27/323/64
7/32″9/161/43/64
1/4″5/89/321/16
5/16″11/1611/321/16
3/8″13/1613/321/16
7/16″59/6415/321/16
1/2″1-1/1617/323/32
9/16″1-3/1619/323/32
5/8″1-5/1621/323/32
3/4″1-1/213/169/64
7/8″1-3/415/169/64
1″21-1/169/64
1-1/8″2-1/41-1/49/64
1-1/4″2-1/21-3/85/32
1-3/8″2-3/41-1/25/32
1-1/2″31-5/85/32

 

Table W4
USS DIMENSIONS FOR LOW CARBON FLAT WASHERS

Bolts SizeA
O.D.
B
I.D.
C
Thickness
3/16″9/161/43/64
1/4″3/45/161/16
5/16″7/83/85/64
3/8″17/165/64
7/16″1-1/41/25/64
1/2″1-3/89/167/64
9/16″1-1/25/87/64
5/8″1-3/411/169/64
3/4″213/165/32
7/8″2-1/415/1611/64
1″2-1/21-1/1611/64
1-1/8″2-3/41-1/411/64
1-1/4″31-3/811/64
1-3/8″3-1/41-1/23/16
1-1/2″3-1/21-5/83/16
1-5/8″3-3/41-3/43/16
1-3/4″41-7/83/16
1-7/8″4-1/423/16
2″4-1/22-1/83/16
2-1/4″4-3/42-3/87/32
2-1/2″52-5/815/64
2-3/4″5-1/42-7/81/4
3″5-1/23-1/817/64

Common Fastener Materials

 

Fasteners are fabricated from a variety of materials. These options include metals and polymers. Stainless steel offers strength and corrosion resistance. While polymer options have less strength than stainless, they are a good choice for resisting chemicals. The most common materials are:

  • Stainless steel
  • Alloy steel
  • Low carbon steel
  • Medium carbon steel
  • Titanium
  • Polymers, such as nylon
Star Washer DIN6798A M6 65Mn Bright Znic/Clear Zinc/Blue White Zinc
MYWAY Metal Washer

Finish Options

 

The use of heat treatments and application of various finishes, also known as “plating,” affects the look and performance of fasteners. Finishes provide material stability and protect the fasteners from corrosion and rust. Below are some common heat treatment and finish benefits:

  • Zinc coating – Most common, low cost, resists corrosion and rust
  • Galvanized – Superior corrosion protection, anti-seize, higher upfront investment
  • Stainless – Great for humid environments, strong, ideal for electrical or mechanical uses
  • Black – Adds color, provides better grip, deflects light

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