| Also known as | W1058 |
| Diagram | Fig. 4 — OIL PUMP AND CONTROL PEDALS · ref 35 |
| Subsystem | wheels |
| Listed in parts books | 1960–1962, 1964–1968 |
Self-locking nut
A self-locking nut used across several Triumph assemblies including the rear wheel, oil pump linkage, and petrol tank mounting.
This is the 37-1058 self-locking nut, a small piece of hardware that shows up all over the bike rather than in just one spot. Catalog listings put it in the oil pump and control pedal assembly, the rear wheel and quickly detachable rear wheel setups, and even the petrol tank mounting, which tells you this is a general-purpose lock nut Triumph used wherever a fastener needed to stay put without a separate lock washer.
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The legacy form of this part number is W1058, so if your parts book or an old invoice shows that instead of 37-1058, it's the same nut. With 32 appearances across the catalog and a spread from 1960 to 1968, it was clearly a nut the factory leaned on across a lot of different assemblies rather than one built for a single job.
Because it turns up in so many different figures, don't assume this exact nut is right for your application just because you see it on a parts list for a similar year machine. Match it against the specific assembly diagram for your bike before you order, and call the shop if you're not sure which fastener you're actually chasing.
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