- Fits 5/16 inch fasteners and has approximately 0.323 inch inside size, with about 0.540 inch outside size, for use with right-hand threads only
- Split lock washer with around 0.040 inch thickness for robust locking on 5/16 inch bolts
- Made of carbon spring steel for durable spring action in aircraft and industrial assemblies
- Cadmium plated finish per QQ‑P‑416, Type II, Class 3 specification with yellow chromate appearance
| Type | Lock Washer |
| Style | Split Helical |
| Size | 3/8" |
| Material | Carbon Steel |
| Finish | Cadmium Plated with Chromate |
| Finish Spec | QQ‑P‑416, Type II, Class 3 |
| Color | Yellow |
| NAS/AN Part No. | NA |
| Nominal Inside Dia | 0.323" |
| Nominal Outside Dia | 0.68" |
| Nominal Thickness | 0.09" |
| Inside Dia Range | 0.315" - 0.331" |
| Outside Dia Range | 0.520" - 0.560" |
| Thickness Range | 0.035" - 0.050" |
| Mil-Spec | MS35338‑46 |
| Series | MS35338 |
| Hardness | Rockwell C 4050 |
