- Fits 1/4 inch fasteners and has approximately 0.260 inch inside size, with about 0.445 inch outside size, for use with right-hand threads only
- Split lock washer with around 0.035 inch thickness for strong locking action on 1/4 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 | 5/16" |
| 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 | 0.260" |
| Nominal Outside Dia | 0.58" |
| Nominal Thickness | 0.08" |
| Inside Dia Range | 0.252" - 0.268" |
| Outside Dia Range | 0.430" - 0.460" |
| Thickness Range | 0.030" - 0.045" |
| Mil-Spec | MS35338‑45 |
| Series | MS35338 |
| Hardness | Rockwell C 4050 |
