This type of washer are used in applications where a decorative or “finished” appearance is desired. Commonly made from steel, stainless steel, brass, or nylon, countersunk washers protect the underlying material while improving the appearance of the countersunk screw.
| Size | 3 | 4 | 5 | 6 | |
| d | min | 3.2 | 4.3 | 5.3 | 6.4 |
| max | 3.5 | 4.6 | 5.6 | 7.76 | |
| dc | min | 9.55 | 12.45 | 14.45 | 17.45 |
| max | 10.45 | 13.55 | 15.55 | 18.55 | |
| H | min | 1.7 | 2.7 | 2.7 | 3.12 |
| max | 2.3 | 3.3 | 3.3 | 3.88 | |
| k | min | 1.2 | 2.2 | 2.2 | 2.7 |
| max | 1.8 | 2.8 | 2.8 | 3.3 | |
| h | 0.4 | 0.4 | 0.5 | 0.5 | |