Round head steel screw, nut on the back, and six weeks later it's loose again. You've been there. M3 spring washers add a constant compressive force between the head and the surface, so the joint doesn't walk free under normal use. Twenty-five in the pack. Slot one under your round head steel screw or nut, tighten to spec, and the spring keeps pulling it home every time the load shifts
| brand | Jaycar |
| size | M3 |
| type | Spring washer |
| compatible_fasteners | Round head steel screws and nuts |
| pack_quantity | 25 |
| category | Electronics & Components > Tools & Soldering |
| rrp | $5.00 |