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 |
Nickel-Plated Steel | |||||||
| M3 | 3.2 | 10.0 | 1.8 | 90° | 5 | 000000000 | 0000 |
| M5 | 5.3 | 16.0 | 2.8 | 90° | 5 | 000000000 | 00000 |
| M6 | 6.4 | 18.0 | 3.3 | 90° | 5 | 000000000 | 00000 |
| M8 | 8.4 | 25.0 | 4.8 | 90° | 5 | 000000000 | 00000 |
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. 5 | 0.140" | 0.500" | 0.094"-0.114" | 82° | 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. 10 | 0.203" | 0.812" | 0.130"-0.151" | 82° | Rockwell B83 | 1 | 0000000 | 0000 |
| 1/4" | 0.281" | 1.250" | 0.271"-0.291" | 82° | 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 |
Cup Washers for Oversized Holes
Cover oversized holes and the ends of tubes and pipe with these cup-shaped washers. They are zinc-plated steel for corrosion resistance in wet environments.
For technical drawings and 3-D models, click on a part number.
| For Screw Size | ID | OD | Dia. (A) | Dia. (B) | Thick. | Overall Ht. | Hardness | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No. 4 | 0.125" | 0.500" | 0.250" | 0.375" | 0.030"-0.065" | 0.135" | Rockwell B75 | 25 | 000000000 | 000000 |
| No. 6 | 0.156" | 0.750" | 0.300" | 0.468" | 0.030"-0.065" | 0.167" | Rockwell B75 | 25 | 000000000 | 00000 |
| No. 8 | 0.172" | 1.000" | 0.355" | 0.531" | 0.030"-0.065" | 0.187" | Rockwell B75 | 10 | 000000000 | 00000 |
| No. 10 | 0.219" | 1.500" | 0.438" | 0.728" | 0.030"-0.065" | 0.197" | Rockwell B40 | 5 | 000000000 | 0000 |
| No. 12 | 0.250" | 2.500" | 0.500" | 0.812" | 0.051"-0.080" | 0.197" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1/4" | 0.281" | 3.000" | 0.562" | 1.000" | 0.051"-0.080" | 0.197" | Rockwell B40 | 5 | 000000000 | 00000 |
| 5/16" | 0.344" | 2.500" | 0.625" | 1.015" | 0.051"-0.080" | 0.197" | Rockwell B40 | 5 | 000000000 | 00000 |
| 3/8" | 0.406" | 3.000" | 0.750" | 1.219" | 0.051"-0.080" | 0.197" | Rockwell B40 | 5 | 000000000 | 00000 |
| 1/2" | 0.531" | 3.500" | 0.987" | 1.593" | 0.051"-0.080" | 0.187" | Rockwell B75 | 5 | 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 |
Countersunk Cushioning Washers
Protect countersunk holes from damage and wear. During installation, these washers act as a protective barrier, so the screw head doesn't scratch the surface. After your screw is installed, they work like other cushioning washers by damping vibration and protecting from wear. These washers are made from nylon, so they 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.
Temperature Range, °F | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | ID | OD | Overall Ht. | Countersink Angle | Min. | Max. | Color | Pkg. Qty. | Pkg. | |
Nylon Plastic | ||||||||||
| No. 10 | 0.200" | 0.488" | 0.177" | 90° | -40° | 180° | White | 10 | 000000000 | 00000 |
| 1/4" | 0.240" | 0.504" | 0.197" | 90° | -40° | 180° | White | 10 | 000000000 | 0000 |
| 5/16" | 0.320" | 0.732" | 0.236" | 90° | -40° | 180° | White | 10 | 000000000 | 0000 |
| 3/8" | 0.397" | 0.898" | 0.276" | 90° | -40° | 180° | White | 10 | 000000000 | 0000 |
Temperature Range, °F | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| For Screw Size | ID, mm | OD, mm | Overall Ht., mm | Countersink Angle | Min. | Max. | Color | Pkg. Qty. | Pkg. | |
Nylon Plastic | ||||||||||
| M4 | 4.100 | 10.400 | 4.300 | 90° | -40° | 180° | White | 10 | 000000000 | 00000 |
| M5 | 5.100 | 12.400 | 4.500 | 90° | -40° | 180° | White | 10 | 000000000 | 0000 |
| M6 | 6.000 | 12.800 | 5.000 | 90° | -40° | 180° | White | 10 | 000000000 | 0000 |
| M8 | 8.100 | 18.600 | 6.000 | 90° | -40° | 180° | White | 10 | 000000000 | 0000 |
| M10 | 10.100 | 22.800 | 7.000 | 90° | -40° | 180° | White | 10 | 000000000 | 0000 |
| M12 | 12.100 | 27.500 | 8.500 | 90° | -40° | 180° | White | 10 | 000000000 | 0000 |