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Maximum Thickness Maximum Thickness |
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Minimum Thickness Minimum Thickness |
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Hardness Hardness |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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About Washers
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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.
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 |
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 |