| Diagram | Fig. 22 — REAR WHEEL · ref 18 |
| Subsystem | wheels |
| Listed in parts books | 1971–1974, 1976–1980, 1983, 1985 |
Nut - wheel spindle (5/8" UNF lf locking)
5/8 inch UNF self-locking wheel spindle nut used on Triumph front and rear wheel and swinging arm applications.
This is the wheel spindle nut, a 5/8 inch UNF locking nut used on the rear wheel and swinging arm area, and it also shows up in front wheel figures in the catalog. It's a self-locking style nut, which is what the "lf locking" in the parts book description is getting at - it's built to stay put on the spindle instead of backing off under vibration and use.
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The part number turns up across a wide run of catalog entries, including versions of the rear wheel setup matched to Smiths and Veglia speedo drive boxes, so it's clearly a wheel-hardware item that carried forward across a number of production changes without itself changing. Given how many figures it's tied to - rear wheel, front wheel, swinging arm and suspension, even a clutch figure - this is a nut Triumph used in more than one spot on the bike, not something dedicated to only one wheel.
Because a spindle nut like this is what keeps the wheel secured and holds your chain adjustment where you set it, it's worth replacing rather than reusing once it's been off and on a few times. Confirm which spindle location and application you need before ordering since this number covers several different mounting spots according to the catalog record.
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