Description
Overview:
Form C Flat Washers with a 20 mm inner diameter are load-spreading washers for general fastening in construction and garden machinery. Made from robust steel with a bright zinc-plated (BZP) finish, they provide dependable corrosion resistance and a smooth bearing surface that helps protect painted and soft materials. The Form C pattern features a larger outside diameter than standard patterns, improving stability under nuts and bolt heads. These washers are suitable for M20 bolts and studs in assemblies such as engine mounts, bracketry, frames, guards, and chassis fixings. Supplied in a cost-effective pack of 100, they are a practical choice for both workshop stock and site use. Manufacturer Part Number: 915188.
Key Features:
- 20 mm inner diameter for use with standard M20 bolts and studs
- Form C large outside diameter to spread load and reduce surface damage
- Zinc-plated steel for reliable corrosion resistance in indoor and outdoor use
- Smooth, flat bearing faces to maintain clamp load and joint integrity
- Helps prevent pull-through on softer materials such as timber, plastics, and thin sheet metal
- Consistent sizing for predictable fit with nuts, bolts, and set screws
- De-burred edges for safer handling and cleaner assembly
- Suitable for vibration-prone assemblies where wider load distribution is beneficial
- Neutral silver finish to match common galvanised and plated fixings
- Supplied in a pack of 100 for efficient stocking and repeat maintenance tasks
Typical Applications:
General fastening on plant and garden equipment, including mower decks, engine and pump mounts, chassis brackets, guards and covers, racking and frames, plate compactor and generator fixings, trailers, fencing base plates, and workshop fabrications. Ideal wherever an M20 fastener needs a wider bearing surface to protect materials and maintain clamp force during assembly, service, or repairs.
Also known as:
Plain washers, M20 flat washers, Form C large OD washers, penny washers (large OD), repair washers (Form C pattern), load-spreading washers, flat rings for bolts, bearing washers.
Product Specifications
| L&S Part No. | 903 0887 |
|---|---|
| OEM No. | 915188 |
| Unit of Sale | Pack of 100 |
| Key Features | - 20 mm inner diameter for M20 bolts and studs - Form C large outside diameter for load distribution - Zinc-plated steel for corrosion resistance - Smooth bearing faces maintain clamp load - Supplied in a pack of 100 for efficiency |
