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About Washers
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General Purpose Washers
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
18-8 stainless steel and 17-7 PH stainless steel washers have good chemical resistance and may be mildly magnetic. 17-7 PH stainless steel washers are stronger than 18-8 stainless steel washers. Black-oxide 18-8 stainless steel washers have a matte-black finish.
Copper, brass, and bronze washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 3 | 0.109" | 0.250" | 0.018"-0.032" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||
| No. 3 | 0.109" | 0.250" | 0.018"-0.032" | Not Rated | ASME B18.21.1 | 100 | 000000000 | 0000 |
17-7 PH Stainless Steel | ||||||||
| No. 3 | 0.109" | 0.250" | 0.018"-0.032" | Rockwell C40 | __ | 10 | 000000000 | 00000 |
Black-Oxide 18-8 Stainless Steel | ||||||||
| No. 3 | 0.109" | 0.250" | 0.010"-0.040" | Rockwell B68 | __ | 50 | 000000000 | 00000 |
Brass | ||||||||
| No. 3 | 0.101" | 0.250" | 0.013"-0.027" | Rockwell B60 | __ | 100 | 000000000 | 0000 |
Oversized Washers
Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses for covering oversized holes or for use as spacers and levelers.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
18-8 stainless steel and 17-4 PH stainless steel washers have good chemical resistance and may be mildly magnetic. Black-oxide 18-8 stainless steel washers have a matte-black finish.
For technical drawings and 3-D models, click on a part number.
Mil. Spec. Washers
Choose these washers for their adherence to strict military standards for material and construction.
18-8 stainless steel and 321 stainless steel washers have excellent corrosion resistance in most environments. They may be mildly magnetic. Passivated 18-8 stainless steel washers have added protection against oxidation and corrosion. Cadmium- and zinc yellow-chromate plated steel washers are corrosion resistant in wet environments.
Aluminum washers are lightweight and have good corrosion resistance. 2024 aluminum washers are easy to machine. They are stronger and resist wear better than 1100 aluminum. They are commonly used in the aircraft industry and in veterinary and orthopedic equipment. Yellow-chromate plated 2024 aluminum washers are more corrosion resistant than 2024 aluminum with no finish.
Copper and brass washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Passivated 18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
MS51496 | ||||||||
| No. 3 | 0.109" | 0.219" | 0.022"-0.028" | Rockwell C20 | MS51496-P64 | 10 | 000000000 | 00000 |
NAS1149 | ||||||||
| No. 3 | 0.105" | 0.250" | 0.014"-0.018" | Rockwell C25 | NAS1149-CN316R | 500 | 000000000 | 0000 |
| No. 3 | 0.105" | 0.250" | 0.028"-0.036" | Rockwell B70 | NAS1149-CN332R | 500 | 000000000 | 0000 |
NAS620 | ||||||||
| No. 3 | 0.102" | 0.180" | 0.015"-0.018" | Rockwell B70 | NAS620C3L | 500 | 000000000 | 00000 |
| No. 3 | 0.102" | 0.180" | 0.030"-0.034" | Rockwell B70 | NAS620C3 | 500 | 000000000 | 00000 |
321 Stainless Steel | ||||||||
MS9321 | ||||||||
| No. 3 | 0.119" | 0.250" | 0.026"-0.036" | Rockwell B68 | MS9321-4 | 50 | 000000000 | 0000 |
MS9549 | ||||||||
| No. 3 | 0.119" | 0.250" | 0.014"-0.018" | Rockwell B68 | MS9549-4 | 100 | 000000000 | 0000 |
Cadmium-Plated Steel | ||||||||
MS27183 | ||||||||
| No. 3 | 0.125" | 0.250" | 0.017"-0.028" | Rockwell B40 | MS27183-3 | 100 | 000000000 | 0000 |
Cadmium Yellow-Chromate Plated Steel | ||||||||
NAS620 | ||||||||
| No. 3 | 0.102" | 0.180" | 0.015"-0.017" | Rockwell B70 | NAS620-3L | 25 | 00000000 | 0000 |
| No. 3 | 0.102" | 0.180" | 0.031"-0.033" | Rockwell B70 | NAS620-3 | 25 | 00000000 | 0000 |
2024 Aluminum | ||||||||
NAS1149 | ||||||||
| No. 3 | 0.105" | 0.250" | 0.013"-0.019" | Not Rated | NAS1149-DN316H | 100 | 000000000 | 00000 |
| No. 3 | 0.105" | 0.250" | 0.028"-0.036" | Not Rated | NAS1149-DN332H | 100 | 000000000 | 00000 |
Yellow-Chromate Plated 2024 Aluminum | ||||||||
NAS1149 | ||||||||
| No. 3 | 0.105" | 0.250" | 0.013"-0.019" | Not Rated | NAS1149-DN316J | 100 | 000000000 | 00000 |
| No. 3 | 0.105" | 0.250" | 0.028"-0.036" | Not Rated | NAS1149-DN332J | 100 | 000000000 | 00000 |
Brass | ||||||||
NAS1149 | ||||||||
| No. 3 | 0.105" | 0.250" | 0.013"-0.019" | Rockwell B60 | NAS1149-BN316H | 50 | 000000000 | 0000 |
SAE Washers
SAE washers generally have a smaller ID and OD than USS washers.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic. Black-oxide washers have a matte-black finish.
Zinc-plated steel washers are corrosion resistant in wet environments.
Black ultra-corrosion-resistant coated steel washers resist chemicals and withstand 1,000 hours of salt spray.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
316 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 3 | 0.109" | 0.250" | 0.025"-0.040" | Rockwell B68 | SAE Standards | 100 | 000000000 | 00000 |
18-8 Stainless Steel | ||||||||
| No. 3 | 0.109" | 0.250" | 0.025"-0.040" | Rockwell B68 | SAE Standards | 100 | 000000000 | 0000 |
Black-Oxide 18-8 Stainless Steel | ||||||||
| No. 3 | 0.109" | 0.250" | 0.025"-0.040" | Rockwell B68 | SAE Standards | 100 | 000000000 | 0000 |
Zinc-Plated Steel | ||||||||
| No. 3 | 0.109" | 0.250" | 0.005"-0.030" | Not Rated | SAE Standards | 100 | 000000000 | 0000 |
| No. 3 | 0.109" | 0.250" | 0.005"-0.030" | Not Rated | SAE Standards | 1,400 | 000000000 | 00000 |
Black Ultra-Corrosion-Resistant Coated Steel | ||||||||
| No. 3 | 0.109" | 0.250" | 0.005"-0.030" | Not Rated | SAE Standards | 10 | 000000000 | 0000 |
Steel | ||||||||
| No. 3 | 0.109" | 0.250" | 0.005"-0.030" | Not Rated | SAE Standards | 100 | 000000000 | 0000 |
Plastic Washers
These plastic washers are good electrical insulators.
Nylon washers are stronger than polycarbonate and UHMW washers. Exposure to moisture may cause them to expand.
For technical drawings and 3-D models, click on a part number.
Chemical-Resistant Plastic Washers
These washers surpass most other plastic washers when it comes to withstanding chemicals, oil, and grease. They are excellent electrical insulators.
PTFE washers withstand high temperatures and have a slippery surface that resists wear in high-friction applications.
PVC washers resist acids and alkalies.
For technical drawings and 3-D models, click on a part number.
High-Temperature Plastic Washers
These are among the most heat resistant plastic washers we carry. All have good chemical resistance.
Polyimide washers are better electrical insulators than PEEK washers.
For technical drawings and 3-D models, click on a part number.
Temperature Range, °F | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | ID | OD | Thick. | Min. | Max. | Hardness | Color | Pkg. Qty. | Pkg. | |
Polyimide Plastic | ||||||||||
| No. 3 | 0.101" | 0.250" | 0.005"-0.006" | -420° | 450° | Not Rated | Orange | 10 | 000000000 | 00000 |
High-Temperature Mica Washers
These washers withstand temperatures up to 1050° F and are excellent electrical insulators. Color ranges from clear to tan.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Max. Temperature, °F | Color | Pkg. Qty. | Pkg. | |
Mica | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 3 | 0.109" | 0.312" | 0.004"-0.006" | 1050° | Tan | 5 | 000000000 | 00000 |
Self-Retaining Washers
A specially shaped ID grips your screw shank tightly. All of these washers are good electrical insulators.
Nylon washers are more wear resistant than polyethylene washers. They are not, however, as moisture resistant.
Polyethylene washers are softer, more flexible, and withstand moisture better than nylon washers. They are not as wear resistant.
For technical drawings and 3-D models, click on a part number.
Split Lock Washers
As a screw is tightened, these washers flatten to add tension to the joint and prevent loosening from small amounts of vibration.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
Zinc- and zinc yellow-chromate plated steel washers are corrosion resistant in wet environments.
Bronze washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive.
Washers that meet ASME B18.21.1 adhere to strict dimensional standards.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 3 | 0.107" | 0.195" | 0.025" | Rockwell C35 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 3 | 0.107" | 0.195" | 0.025" | Rockwell C35 | ASME B18.21.1 | 1,000 | 000000000 | 00000 |
Zinc-Plated Steel | ||||||||
| No. 3 | 0.107" | 0.195" | 0.025" | Rockwell C38 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 3 | 0.107" | 0.195" | 0.025" | Rockwell C38 | ASME B18.21.1 | 1,000 | 000000000 | 0000 |
Bronze | ||||||||
| No. 3 | 0.107" | 0.195" | 0.025" | Rockwell B90 | ASME B18.21.1 | 100 | 000000000 | 0000 |
External-Tooth Lock Washers
Teeth on the outside edge of the washer bite into the screw head and joint for a tight grip. Use with fasteners that have heads large enough to make contact with the teeth, such as pan, button, and binding head screws.
400 series stainless steel washers have excellent wear resistance, but aren’t as corrosion resistant as other stainless steel washers. They may be mildly magnetic.
Zinc-plated steel washers are corrosion resistant in wet environments.
Washers that meet ASME B18.21.1 adhere to strict dimensional standards.The zinc-plated steel washers also meet standards for material properties.
For technical drawings and 3-D models, click on a part number.
Internal-Tooth Lock Washers
Internal teeth dig into the screw head while the smooth outside edge won't snag objects. These washers provide greater vibration resistance than split lock washers. Use with fasteners that have small heads, such as fillister and cheese head screws.
400 series stainless steel washers have excellent wear resistance, but aren’t as corrosion resistant as other stainless steel washers. They may be mildly magnetic.
Zinc-plated steel washers are corrosion resistant in wet environments.
Washers that meet ASME B18.21.1 adhere to strict dimensional standards. The zinc-plated steel washers also meet standards for material properties.
For technical drawings and 3-D models, click on a part number.
Electrical-Insulating Unthreaded Spacers
Protect components from electrical charges.
Ceramic spacers withstand high temperatures.
For technical drawings and 3-D models, click on a part number.