It's a 5mm Nylon Washer, which is a also called nylon shim or nylon spacer. Nylon Washers usually have an outer diameter (OD) about twice the width of their inner diameter (ID). You can use it as a spacer, spring, wear pad, preload indicating device, locking device, and to reduce vibration and insulation. The main role of flat washers is to increase the size of a screw's bearing surface area, and reduce the surface pressure applied on the fastened object. Looseness can result when the bearing surface sinks under the surface pressure, and thus, using a flat washer to reduce the surface pressure is very effective.
Specifications:
| Product Type | Washer (Flat) |
| Material | Nylon |
| Color | White |
| Outer Diameter | 9.55mm |
| Inner Diameter | 4mm |
| Thickness | 1.20mm |
| Country of Origin | China |
