| Also known as | E2287 |
| Diagram | Fig. 25 — ELECTRICAL EQUIPMENT · ref 41 |
| Subsystem | engine top |
| Listed in parts books | 1960–1964, 1967–1970 |
Serrated washer
A 5/16 in. serrated lock washer used across multiple assemblies on the bike, from gearbox to forks to inlet manifolds.
70-2287 is a serrated washer, a small locking washer that shows up in a wide range of spots across the bike rather than being tied to one job. The catalog record shows it turning up under electrical equipment, gearbox shafts and gears, front fork work, inlet manifolds on both single and twin carb setups, mudguard mounting, and oil tank fittings, which tells you this is one of those general-purpose fasteners Triumph used wherever a nut or screw needed some bite against loosening. The legacy alias E2287 is the same physical part under the older number, so if your parts book lists E2287 you're looking at this washer.
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A serrated washer works by digging its teeth into the mating surface and the underside of the fastener, resisting the vibration that would otherwise walk a nut or screw loose over time. Given how many figures this one appears in, it's worth keeping a few on hand rather than hunting one down mid-job.
The catalog entries span 1960 through 1970, but since this washer shows up across so many different systems, don't assume any one figure title tells you the full fitment picture for your machine — check the specific assembly you're working on.
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