- Fits 5/16 in fasteners and has 0.375 in inside size with 0.875 in outside size
- Standard version washer with approximately 0.083 in thickness
- Made of carbon steel with typical minimum tensile strength comparable to 1020 steel for aircraft hardware applications
- Cadmium plated finish per QQ‑P‑416, Type II, Class 3 for thin, corrosion‑resistant chromate‑treated coating
| Type | Washer |
| Style | Flat Carbon Steel Aircraft, MS |
| Size | 5/16" |
| Material | Carbon Steel |
| Finish | Chromate Cadmium Finish |
| Finish Spec | Cadmium plated finish per QQ‑P‑416, Type II, Class 3 |
| Color | Gold Iridescent |
| NAS/AN Part No. | no direct AN/NAS designation |
| Nominal Inside Dia | .375" |
| Nominal Outside Dia | .875" |
| Nominal Thickness | 0.083" |
| Inside Dia Range | 0.370" min - 0.390" max |
| Outside Dia Range | 0.868" min - 0.905" max |
| Thickness Range | 0.064" - 0.104" |
| Mil-Spec | MS27183‑13 |
| Series | MS27183 |
