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Product Information

 

 

Small flat washers are thin metal or plastic disks with a hole in the center of the disc. Their diameter can vary from fractions of an inch to several inches. Small flat washers are used to distribute or balance loads, reduce friction between two surfaces, prevent damage to surfaces, and in some cases, act as spacers or fillers.

What are Small Flat Washers?
Small flat washers are thin metal or plastic disks with a hole in the center of the disc. Their diameter can vary from fractions of an inch to several inches. Small flat washers are used to distribute or balance loads, reduce friction between two surfaces, prevent damage to surfaces, and in some cases, act as spacers or fillers.

Types of Small Flat Washers:
Small flat washers come in a variety of materials including stainless steel, brass, aluminum, and plastic. They can be classified into various types depending on their shape, size, and application. Some common types include:
– Plain flat washers: These are simple flat washers made of different materials and used to distribute loads and prevent damage to surfaces.
– Shoulder washers: These are flat washers with a shoulder that provides a larger surface area that can be used as a bushing.
– Countersunk washers: These washers are specially designed to fit into a countersunk or beveled hole and can be used to create a flat surface.
– Fender washers: These washers are used in automotive applications to provide additional support to fenders.
– Finishing washers: These are decorative washers used to cover the heads of screws or bolts.

Applications of Small Flat Washers:
Small flat washers have a wide range of applications in various industries and household equipment. Here are some typical applications of small flat washers:
– Automotive industry: Small flat washers are used in automotive applications such as securing hoses, electrical connections, and brake lines.
– Aerospace industry: Small flat washers are used in aerospace applications to distribute loads and prevent damage to surfaces.
– Building and construction industry: Small flat washers are used in the construction of buildings and other structures to distribute loads and anchor bolts.
– Electrical industry: Small flat washers are used in electrical applications such as grounding wires and securing switches and outlets.
– Plumbing industry: Small flat washers are used in plumbing applications to create a leak-proof seal between pipes and fittings.
In conclusion, small flat washers may be small in size, but they play an essential role in various applications. They serve various functions in different industries, and with various types available, having an understanding of which washer to use is important.

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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