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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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About Washers
More
Countersunk Washers
Flat and oval head screws sit flush within these washers for a neat, finished appearance.
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.
Nickel-plated steel washers have excellent corrosion resistance and a decorative finish.
Brass washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive. Black zinc- and nickel-plated brass washers have a decorative finish.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Overall Ht. | Countersink Angle | Pkg. Qty. | Pkg. | |
Flanged Washers | |||||||
|---|---|---|---|---|---|---|---|
18-8 Stainless Steel | |||||||
| No. 6 | 0.180" | 0.500" | 0.110" | 82° | 100 | 000000000 | 00000 |
| No. 8 | 0.210" | 0.609" | 0.125" | 82° | 100 | 000000000 | 0000 |
| No. 10 | 0.250" | 0.703" | 0.125" | 82° | 100 | 000000000 | 0000 |
Nickel-Plated Brass | |||||||
| No. 8 | 0.203" | 0.625" | 0.112" | 82° | 100 | 000000000 | 00000 |
| No. 10 | 0.250" | 0.688" | 0.119" | 82° | 100 | 000000000 | 00000 |
Washers | |||||||
316 Stainless Steel | |||||||
| No. 4 | 0.140" | 0.390" | 0.110" | 82° | 50 | 000000000 | 0000 |
| No. 6 | 0.180" | 0.438" | 0.110" | 82° | 50 | 000000000 | 0000 |
| No. 8 | 0.210" | 0.531" | 0.130" | 82° | 50 | 000000000 | 0000 |
| No. 10 | 0.250" | 0.593" | 0.130" | 82° | 50 | 000000000 | 0000 |
| No. 12 | 0.280" | 0.688" | 0.160" | 82° | 25 | 000000000 | 0000 |
| 1/4" | 0.320" | 0.781" | 0.180" | 82° | 25 | 000000000 | 0000 |
18-8 Stainless Steel | |||||||
| No. 4 | 0.150" | 0.375" | 0.110" | 82° | 100 | 000000000 | 0000 |
| No. 6 | 0.180" | 0.438" | 0.110" | 82° | 100 | 000000000 | 0000 |
| No. 8 | 0.210" | 0.531" | 0.130" | 82° | 100 | 000000000 | 0000 |
| No. 10 | 0.250" | 0.594" | 0.130" | 82° | 100 | 000000000 | 0000 |
| No. 12 | 0.280" | 0.688" | 0.160" | 82° | 100 | 000000000 | 0000 |
| 1/4" | 0.320" | 0.781" | 0.180" | 82° | 100 | 000000000 | 0000 |
| 5/16" | 0.380" | 0.891" | 0.180" | 82° | 50 | 000000000 | 0000 |
| 3/8" | 0.445" | 1.125" | 0.250" | 82° | 50 | 000000000 | 0000 |
Nickel-Plated Steel | |||||||
| No. 4 | 0.125" | 0.375" | 0.103" | 82° | 100 | 000000000 | 0000 |
| No. 6 | 0.160" | 0.469" | 0.102" | 82° | 100 | 000000000 | 00000 |
| No. 8 | 0.180" | 0.531" | 0.120" | 82° | 100 | 000000000 | 00000 |
| No. 10 | 0.235" | 0.594" | 0.122" | 82° | 100 | 000000000 | 00000 |
| No. 12 | 0.259" | 0.656" | 0.156" | 82° | 100 | 000000000 | 00000 |
| 1/4" | 0.305" | 0.781" | 0.160" | 82° | 100 | 000000000 | 00000 |
| 5/16" | 0.391" | 0.906" | 0.188" | 82° | 50 | 000000000 | 00000 |
| 3/8" | 0.420" | 1.250" | 0.260" | 82° | 25 | 000000000 | 0000 |
Brass | |||||||
| No. 4 | 0.140" | 0.375" | 0.110" | 82° | 100 | 000000000 | 0000 |
| No. 6 | 0.180" | 0.438" | 0.110" | 82° | 100 | 000000000 | 0000 |
| No. 8 | 0.210" | 0.531" | 0.130" | 82° | 100 | 000000000 | 0000 |
| No. 10 | 0.250" | 0.594" | 0.130" | 82° | 100 | 000000000 | 0000 |
| No. 12 | 0.280" | 0.688" | 0.160" | 82° | 100 | 000000000 | 00000 |
| 1/4" | 0.320" | 0.781" | 0.180" | 82° | 100 | 000000000 | 00000 |
| 3/8" | 0.470" | 1.125" | 0.290" | 82° | 10 | 000000000 | 0000 |
Black Zinc-Plated Brass | |||||||
| No. 6 | 0.172" | 0.438" | 0.102" | 82° | 100 | 000000000 | 00000 |
| No. 8 | 0.203" | 0.500" | 0.112" | 82° | 100 | 000000000 | 00000 |
| No. 10 | 0.250" | 0.594" | 0.122" | 82° | 100 | 000000000 | 00000 |
Nickel-Plated Brass | |||||||
| No. 4 | 0.140" | 0.375" | 0.110" | 82° | 100 | 000000000 | 0000 |
| No. 6 | 0.180" | 0.438" | 0.110" | 82° | 100 | 000000000 | 0000 |
| No. 8 | 0.210" | 0.531" | 0.130" | 82° | 100 | 000000000 | 00000 |
| No. 10 | 0.250" | 0.594" | 0.130" | 82° | 100 | 000000000 | 00000 |
| No. 12 | 0.280" | 0.688" | 0.160" | 82° | 50 | 000000000 | 0000 |
| 1/4" | 0.320" | 0.781" | 0.180" | 82° | 50 | 000000000 | 00000 |
| 5/16" | 0.380" | 0.891" | 0.180" | 82° | 25 | 000000000 | 00000 |
| 3/8" | 0.470" | 1.125" | 0.290" | 82° | 10 | 000000000 | 00000 |
Metric Countersunk Washers
Flat and oval head screws sit flush within these washers for a neat, finished appearance.
Zinc- and chrome-plated steel washers are corrosion resistant in wet environments.
Nickel-plated brass washers are corrosion resistant in wet environments, nonmagnetic, and electrically conductive. They have a decorative finish.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
Aluminum washers are lightweight and corrosion resistant in wet environments.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Overall Ht., mm | Countersink Angle | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||
|---|---|---|---|---|---|---|---|
| M2.5 | 2.7 | 9.0 | 1.6 | 90° | 25 | 000000000 | 000000 |
| M3 | 3.2 | 10.0 | 1.8 | 90° | 25 | 000000000 | 0000 |
| M4 | 4.3 | 14.0 | 2.3 | 90° | 25 | 000000000 | 00000 |
| M5 | 5.3 | 16.0 | 2.8 | 90° | 25 | 000000000 | 00000 |
| M6 | 6.4 | 18.0 | 3.3 | 90° | 10 | 000000000 | 0000 |
| M8 | 8.4 | 25.0 | 4.8 | 90° | 5 | 000000000 | 0000 |
| M10 | 10.5 | 30.0 | 6.5 | 90° | 1 | 000000000 | 0000 |
Chrome-Plated Steel | |||||||
| M2.5 | 2.7 | 9.0 | 1.6 | 90° | 1 | 000000000 | 0000 |
| M3 | 3.2 | 10.0 | 1.8 | 90° | 1 | 000000000 | 0000 |
| M4 | 4.3 | 14.0 | 2.3 | 90° | 1 | 000000000 | 0000 |
| M5 | 5.3 | 16.0 | 2.8 | 90° | 1 | 000000000 | 0000 |
| M6 | 6.4 | 18.0 | 3.3 | 90° | 1 | 000000000 | 0000 |
| M8 | 8.4 | 25.0 | 4.8 | 90° | 1 | 000000000 | 0000 |
Nickel-Plated Brass | |||||||
| M3 | 4.1 | 9.0 | 1.8 | 90° | 25 | 000000000 | 0000 |
| M4 | 6.0 | 13.0 | 2.3 | 90° | 25 | 000000000 | 00000 |
| M5 | 7.0 | 15.0 | 2.5 | 90° | 10 | 000000000 | 0000 |
| M6 | 8.0 | 16.0 | 3.2 | 90° | 10 | 000000000 | 0000 |
18-8 Stainless Steel | |||||||
| M2.5 | 2.7 | 9.0 | 1.6 | 90° | 10 | 000000000 | 00000 |
| M3 | 3.2 | 10.0 | 1.8 | 90° | 10 | 000000000 | 0000 |
| M4 | 4.3 | 14.0 | 2.3 | 90° | 10 | 000000000 | 0000 |
| M5 | 5.3 | 16.0 | 2.8 | 90° | 5 | 000000000 | 0000 |
| M6 | 6.4 | 18.0 | 3.3 | 90° | 5 | 000000000 | 0000 |
| M8 | 8.4 | 25.0 | 4.8 | 90° | 1 | 000000000 | 0000 |
| M10 | 10.5 | 30.0 | 6.5 | 90° | 1 | 000000000 | 0000 |
Aluminum | |||||||
| M3 | 3.2 | 10.0 | 1.8 | 90° | 10 | 000000000 | 0000 |
| M4 | 4.3 | 14.0 | 2.3 | 90° | 10 | 000000000 | 00000 |
| M5 | 5.3 | 16.0 | 2.8 | 90° | 10 | 000000000 | 00000 |
| M6 | 6.4 | 18.0 | 3.3 | 90° | 10 | 000000000 | 00000 |
| M8 | 8.4 | 25.0 | 4.8 | 90° | 5 | 000000000 | 00000 |
Plastic Countersunk Washers
Plastic washers are good electrical insulators. Flat and oval head screws sit flush within these for a neat, finished appearance. Exposure to moisture may cause these nylon washers to expand.
For technical drawings and 3-D models, click on a part number.
Temperature Range, °F | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | ID | OD | Overall Ht. | Countersink Angle | Min. | Max. | Hardness | Choose a Color | Pkg. Qty. | Pkg. | |
Nylon Plastic | |||||||||||
| No. 6 | 0.143" | 0.438" | 0.1" | 82° | -40° | 180° | Rockwell R120 | 100 | 000000000 | 000000 | |
| No. 8 | 0.171" | 0.51" | 0.115" | 82° | -40° | 180° | Rockwell R120 | 100 | 000000000 | 00000 | |
| No. 10 | 0.196" | 0.575" | 0.152" | 82° | -40° | 180° | Rockwell R120 | 100 | 000000000 | 00000 | |
| No. 12 | 0.225" | 0.609" | 0.16" | 82° | -40° | 180° | Rockwell R120 | 100 | 000000000 | 00000 | |
| 1/4" | 0.26" | 0.683" | 0.18" | 82° | -40° | 180° | Rockwell R120 | 100 | 000000000 | 00000 | |
Temperature Range, °F | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | ID, mm | OD, mm | Overall Ht., mm | Countersink Angle | Min. | Max. | Hardness | Choose a Color | Pkg. Qty. | Pkg. | |
Nylon Plastic | |||||||||||
| M3 | 3 | 9.2 | 1.9 | 90° | -40° | 180° | Rockwell R120 | 25 | 000000000 | 00000 | |
| M4 | 4.3 | 11.9 | 3 | 90° | -40° | 180° | Rockwell R120 | 25 | 000000000 | 0000 | |
| M5 | 5.3 | 15.3 | 3.5 | 90° | -40° | 180° | Rockwell R120 | 25 | 000000000 | 0000 | |
| M6 | 6.3 | 17 | 4.5 | 90° | -40° | 180° | Rockwell R120 | 10 | 000000000 | 0000 | |
| M8 | 8 | 22.3 | 5.9 | 90° | -40° | 180° | Rockwell R120 | 10 | 000000000 | 0000 | |
Nylon Plastic with Rounded Face | |||||||||||
| M3 | 3.2 | 14 | 2.9 | 90° | -40° | 180° | Rockwell R120 | 25 | 000000000 | 0000 | |
| M4 | 4.3 | 16 | 3.7 | 90° | -40° | 180° | Rockwell R120 | 25 | 000000000 | 0000 | |
| M5 | 5.2 | 18 | 3.8 | 90° | -40° | 180° | Rockwell R120 | 10 | 000000000 | 0000 | |
| M6 | 6.4 | 22 | 4.5 | 90° | -40° | 180° | Rockwell R120 | 10 | 000000000 | 0000 | |
Finishing Countersunk Washers
Also known as dress washers, these are machined to be sturdier and provide a neater appearance than standard countersunk washers. Flat and oval head screws sit flush within them.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic
Black-oxide steel washers are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Thick. | Countersink Angle | Hardness | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| No. 4 | 0.125" | 0.438" | 0.084"-0.104" | 82° | Rockwell B83 | 1 | 000000000 | 00000 |
| No. 4 | 0.125" | 0.438" | 0.084"-0.104" | 100° | Rockwell B83 | 1 | 000000000 | 0000 |
| No. 5 | 0.140" | 0.500" | 0.084"-0.104" | 100° | Rockwell B83 | 1 | 000000000 | 0000 |
| No. 5 | 0.140" | 0.500" | 0.094"-0.114" | 82° | Rockwell B83 | 1 | 000000000 | 0000 |
| No. 6 | 0.156" | 0.562" | 0.084"-0.104" | 100° | Rockwell B83 | 1 | 000000000 | 0000 |
| No. 6 | 0.156" | 0.562" | 0.097"-0.117" | 82° | Rockwell B83 | 1 | 000000000 | 0000 |
| No. 8 | 0.188" | 0.750" | 0.115"-0.135" | 82° | Rockwell B83 | 1 | 000000000 | 0000 |
| No. 8 | 0.188" | 0.750" | 0.115"-0.135" | 100° | Rockwell B83 | 1 | 000000000 | 0000 |
| No. 10 | 0.203" | 0.812" | 0.130"-0.151" | 82° | Rockwell B83 | 1 | 000000000 | 0000 |
| No. 10 | 0.203" | 0.812" | 0.130"-0.151" | 100° | Rockwell B83 | 1 | 000000000 | 0000 |
| 1/4" | 0.281" | 1.250" | 0.271"-0.291" | 82° | Rockwell B83 | 1 | 000000000 | 00000 |
| 1/4" | 0.281" | 1.250" | 0.271"-0.291" | 100° | Rockwell B83 | 1 | 000000000 | 00000 |
| 5/16" | 0.344" | 1.250" | 0.198"-0.218" | 82° | Rockwell B83 | 1 | 000000000 | 00000 |
316 Stainless Steel | ||||||||
| No. 4 | 0.125" | 0.438" | 0.084"-0.104" | 82° | Rockwell B83 | 1 | 0000000 | 0000 |
| No. 4 | 0.125" | 0.438" | 0.084"-0.104" | 100° | Rockwell B83 | 1 | 0000000 | 0000 |
| No. 5 | 0.140" | 0.500" | 0.084"-0.104" | 100° | Rockwell B83 | 1 | 0000000 | 0000 |
| No. 5 | 0.140" | 0.500" | 0.094"-0.114" | 82° | Rockwell B83 | 1 | 0000000 | 0000 |
| No. 6 | 0.156" | 0.562" | 0.084"-0.104" | 100° | Rockwell B83 | 1 | 0000000 | 0000 |
| No. 6 | 0.156" | 0.562" | 0.097"-0.117" | 82° | Rockwell B83 | 1 | 0000000 | 0000 |
| No. 8 | 0.188" | 0.750" | 0.115"-0.135" | 82° | Rockwell B83 | 1 | 0000000 | 0000 |
| No. 8 | 0.188" | 0.750" | 0.115"-0.135" | 100° | Rockwell B83 | 1 | 0000000 | 0000 |
| No. 10 | 0.203" | 0.812" | 0.130"-0.151" | 82° | Rockwell B83 | 1 | 0000000 | 0000 |
| No. 10 | 0.203" | 0.812" | 0.130"-0.151" | 100° | Rockwell B83 | 1 | 0000000 | 0000 |
| 1/4" | 0.281" | 1.250" | 0.271"-0.291" | 82° | Rockwell B83 | 1 | 0000000 | 00000 |
| 1/4" | 0.281" | 1.250" | 0.271"-0.291" | 100° | Rockwell B83 | 1 | 0000000 | 00000 |
| 5/16" | 0.344" | 1.250" | 0.198"-0.218" | 82° | Rockwell B83 | 1 | 0000000 | 00000 |
Black-Oxide Steel | ||||||||
| No. 4 | 0.125" | 0.438" | 0.084"-0.104" | 82° | Rockwell 15N80 | 5 | 000000000 | 0000 |
| No. 4 | 0.125" | 0.438" | 0.084"-0.104" | 100° | Rockwell 15N80 | 5 | 000000000 | 00000 |
| No. 5 | 0.140" | 0.500" | 0.084"-0.104" | 100° | Rockwell 15N80 | 5 | 000000000 | 00000 |
| No. 5 | 0.140" | 0.500" | 0.094"-0.114" | 82° | Rockwell 15N80 | 5 | 000000000 | 00000 |
| No. 6 | 0.156" | 0.562" | 0.084"-0.104" | 100° | Rockwell 15N80 | 5 | 000000000 | 00000 |
| No. 6 | 0.156" | 0.562" | 0.097"-0.117" | 82° | Rockwell 15N80 | 5 | 000000000 | 00000 |
| No. 8 | 0.188" | 0.750" | 0.115"-0.135" | 82° | Rockwell 15N80 | 5 | 000000000 | 0000 |
| No. 8 | 0.188" | 0.750" | 0.115"-0.135" | 100° | Rockwell 15N80 | 5 | 000000000 | 00000 |
| No. 8 | 0.188" | 1.000" | 0.115"-0.135" | 82° | Rockwell 15N80 | 5 | 000000000 | 00000 |
| No. 10 | 0.203" | 0.812" | 0.130"-0.151" | 82° | Rockwell 15N80 | 5 | 000000000 | 00000 |
| No. 10 | 0.203" | 0.812" | 0.130"-0.151" | 100° | Rockwell 15N80 | 1 | 000000000 | 0000 |
| No. 10 | 0.203" | 1.250" | 0.130"-0.151" | 82° | Rockwell 15N80 | 1 | 000000000 | 0000 |
| No. 10 | 0.203" | 1.250" | 0.130"-0.151" | 100° | Rockwell 15N80 | 1 | 000000000 | 0000 |
| 1/4" | 0.281" | 1.250" | 0.271"-0.291" | 82° | Rockwell 15N80 | 1 | 000000000 | 0000 |
| 1/4" | 0.281" | 1.250" | 0.271"-0.291" | 100° | Rockwell 15N80 | 1 | 000000000 | 0000 |
| 1/4" | 0.281" | 2.000" | 0.271"-0.291" | 82° | Rockwell 15N80 | 1 | 000000000 | 00000 |
| 5/16" | 0.344" | 1.250" | 0.198"-0.218" | 82° | Rockwell 15N80 | 1 | 000000000 | 00000 |
Metric Finishing Countersunk Washers
Also known as dress washers, these are machined to be sturdier and provide a neater appearance than standard countersunk washers. Flat and oval head screws sit flush within them.
18-8 stainless steel washers have good chemical resistance and may be mildly magnetic.
316 stainless steel washers have excellent resistance to chemicals and salt water. They may be mildly magnetic.
Black-oxide steel washers are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thick., mm | Countersink Angle | Hardness | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| M3 | 3.2 | 12.0 | 2.2-2.8 | 90° | Rockwell B83 | 1 | 000000000 | 00000 |
| M3 | 3.2 | 12.0 | 2.2-2.8 | 100° | Rockwell B83 | 1 | 000000000 | 0000 |
| M4 | 4.3 | 16.0 | 2.7-3.3 | 90° | Rockwell B83 | 1 | 000000000 | 0000 |
| M4 | 4.3 | 16.0 | 2.7-3.3 | 100° | Rockwell B83 | 1 | 000000000 | 0000 |
| M5 | 5.3 | 22.0 | 3.2-3.8 | 90° | Rockwell B83 | 1 | 000000000 | 0000 |
| M5 | 5.3 | 22.0 | 3.2-3.8 | 100° | Rockwell B83 | 1 | 000000000 | 0000 |
| M6 | 6.4 | 32.0 | 3.7-4.3 | 90° | Rockwell B83 | 1 | 000000000 | 00000 |
| M6 | 6.4 | 32.0 | 3.7-4.3 | 100° | Rockwell B83 | 1 | 000000000 | 00000 |
| M8 | 8.4 | 32.0 | 4.5-5.1 | 90° | Rockwell B83 | 1 | 000000000 | 00000 |
316 Stainless Steel | ||||||||
| M3 | 3.2 | 12.0 | 2.2-2.8 | 90° | Rockwell B83 | 1 | 0000000 | 0000 |
| M3 | 3.2 | 12.0 | 2.2-2.8 | 100° | Rockwell B83 | 1 | 0000000 | 0000 |
| M4 | 4.3 | 16.0 | 2.7-3.3 | 90° | Rockwell B83 | 1 | 0000000 | 0000 |
| M4 | 4.3 | 16.0 | 2.7-3.3 | 100° | Rockwell B83 | 1 | 0000000 | 0000 |
| M5 | 5.3 | 22.0 | 3.2-3.8 | 90° | Rockwell B83 | 1 | 0000000 | 0000 |
| M5 | 5.3 | 22.0 | 3.2-3.8 | 100° | Rockwell B83 | 1 | 0000000 | 00000 |
| M6 | 6.4 | 32.0 | 3.7-4.3 | 90° | Rockwell B83 | 1 | 0000000 | 00000 |
| M6 | 6.4 | 32.0 | 3.7-4.3 | 100° | Rockwell B83 | 1 | 0000000 | 00000 |
| M8 | 8.4 | 32.0 | 4.5-5.1 | 90° | Rockwell B83 | 1 | 0000000 | 00000 |
Black-Oxide Steel | ||||||||
| M3 | 3.2 | 12.0 | 2.2-2.8 | 90° | Rockwell 15N80 | 5 | 000000000 | 0000 |
| M3 | 3.2 | 12.0 | 2.2-2.8 | 100° | Rockwell 15N80 | 5 | 000000000 | 0000 |
| M4 | 4.3 | 16.0 | 2.7-3.3 | 90° | Rockwell 15N80 | 5 | 000000000 | 0000 |
| M4 | 4.3 | 16.0 | 2.7-3.3 | 100° | Rockwell 15N80 | 5 | 000000000 | 0000 |
| M5 | 5.3 | 22.0 | 3.2-3.8 | 90° | Rockwell 15N80 | 5 | 000000000 | 00000 |
| M5 | 5.3 | 22.0 | 3.2-3.8 | 100° | Rockwell 15N80 | 1 | 000000000 | 0000 |
| M6 | 6.4 | 32.0 | 3.7-4.3 | 90° | Rockwell 15N80 | 1 | 000000000 | 0000 |
| M6 | 6.4 | 32.0 | 3.7-4.3 | 100° | Rockwell 15N80 | 1 | 000000000 | 0000 |
| M8 | 8.4 | 32.0 | 4.5-5.1 | 90° | Rockwell 15N80 | 1 | 000000000 | 00000 |
Countersunk Tight-Grip External-Tooth Lock Washers
To keep 90° countersunk screws from loosening in vibration applications, the teeth on these washers bite further into the screw head and joint than standard external-tooth lock washers for a more secure hold. Made of zinc-plated steel, these washers resist corrosion in wet environments. All meet DIN dimensional standards.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID, mm | OD, mm | Thickness, mm | Countersink Angle | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| M3 | 3.2 | 6.0 | 0.15-0.25 | 90° | Rockwell C35 | DIN 6798 | 100 | 00000000 | 00000 |
| M4 | 4.3 | 8.0 | 0.20-0.30 | 90° | Rockwell C35 | DIN 6798 | 100 | 00000000 | 0000 |
| M5 | 5.3 | 9.8 | 0.25-0.35 | 90° | Rockwell C35 | DIN 6798 | 50 | 00000000 | 0000 |
| M6 | 6.4 | 11.8 | 0.35-0.45 | 90° | Rockwell C35 | DIN 6798 | 50 | 00000000 | 0000 |
| M8 | 8.4 | 15.3 | 0.35-0.45 | 90° | Rockwell C35 | DIN 6798 | 50 | 00000000 | 0000 |
| M10 | 10.5 | 19.0 | 0.45-0.55 | 90° | Rockwell C35 | DIN 6798 | 25 | 00000000 | 0000 |
| M12 | 13.0 | 23.0 | 0.45-0.55 | 90° | Rockwell C35 | DIN 6798 | 25 | 00000000 | 0000 |
Countersunk External-Tooth Lock Washers
The teeth on these washers firmly grip heads of 82° flat head countersunk screws to prevent joints from loosening under vibration.
Black-oxide steel washers are mildly corrosion resistant in dry environments.
Zinc-plated steel washers are corrosion resistant in wet environments.
400-series stainless steel washers have excellent wear resistance and may be mildly magnetic.
All washers meet ASME B18.21.1 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.
| For Screw Size | ID | OD | Thick. | Countersink Angle | Hardness | Specifications Met | Pkg. Qty. | Pkg. | |
Black-Oxide Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| No. 4 | 0.113" | 0.213" | 0.015"-0.019" | 82° | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| No. 6 | 0.140" | 0.289" | 0.017"-0.021" | 82° | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| No. 8 | 0.167" | 0.322" | 0.017"-0.021" | 82° | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| No. 10 | 0.195" | 0.354" | 0.020"-0.025" | 82° | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| No. 12 | 0.220" | 0.421" | 0.020"-0.025" | 82° | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/4" | 0.255" | 0.454" | 0.020"-0.025" | 82° | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 5/16" | 0.318" | 0.599" | 0.023"-0.028" | 82° | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 3/8" | 0.383" | 0.765" | 0.028"-0.034" | 82° | Rockwell C40 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 1/2" | 0.512" | 0.976" | 0.037"-0.045" | 82° | Rockwell C40 | ASME B18.21.1 | 10 | 000000000 | 00000 |
Zinc-Plated Steel | |||||||||
| No. 4 | 0.113" | 0.213" | 0.015"-0.019" | 82° | Rockwell C44 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| No. 6 | 0.140" | 0.289" | 0.017"-0.021" | 82° | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 8 | 0.167" | 0.322" | 0.017"-0.021" | 82° | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.354" | 0.020"-0.025" | 82° | Rockwell C44 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| No. 12 | 0.220" | 0.421" | 0.020"-0.025" | 82° | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 1/4" | 0.255" | 0.458" | 0.022" | 82° | Rockwell C40 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 5/16" | 0.318" | 0.599" | 0.023"-0.028" | 82° | Rockwell C44 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| 3/8" | 0.383" | 0.765" | 0.028"-0.034" | 82° | Rockwell C44 | ASME B18.21.1 | 25 | 000000000 | 00000 |
| 1/2" | 0.512" | 0.976" | 0.037"-0.045" | 82° | Rockwell C44 | ASME B18.21.1 | 10 | 000000000 | 0000 |
400 Series Stainless Steel | |||||||||
| No. 6 | 0.140" | 0.289" | 0.017"-0.021" | 82° | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 0000 |
| No. 8 | 0.167" | 0.322" | 0.017"-0.021" | 82° | Rockwell C34 | ASME B18.21.1 | 100 | 000000000 | 00000 |
| No. 10 | 0.195" | 0.354" | 0.020"-0.025" | 82° | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| No. 12 | 0.220" | 0.421" | 0.020"-0.025" | 82° | Rockwell C34 | ASME B18.21.1 | 50 | 000000000 | 00000 |
| 1/4" | 0.255" | 0.454" | 0.020"-0.025" | 82° | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 0000 |
| 5/16" | 0.318" | 0.599" | 0.023"-0.028" | 82° | Rockwell C34 | ASME B18.21.1 | 25 | 000000000 | 0000 |