| Diagram | Fig. 4 — CYLINDER BLOCK AND HEAD, 6T AND TR6 · ref 23 |
| Subsystem | engine bottom |
| Listed in parts books | 1960–1973 |
Plain washer
A general-purpose plain washer used across numerous Triumph fastener locations, later superseded by 60-4247.
S25-3 is a plain washer that shows up all over the Triumph parts books, from cylinder head and crankcase fasteners to fork parts, gearbox covers, exhaust mounts, oil tanks, and carburetor fittings. It's one of those general-purpose hardware pieces the factory used wherever a bolt or stud needed a flat bearing surface under a nut, rather than a part tied to one specific job.
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Given how many figures list this washer, it's fair to say it turns up across a wide slice of the catalog, on both engine and cycle-part fasteners, spanning years of production. If you're chasing down a specific fastener stack on your machine, matching the figure and item number in your parts book is the way to confirm this is the right washer for that spot.
This number was later superseded by 60-4247, so if your bike's fastener list or a newer parts diagram shows that number instead, it's the same physical washer under Triumph's later part numbering.
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