| Also known as | H1658 |
| Diagram | Fig. 18 — TELESCOPIC FRONT FORK, TR6 AND T120 · ref 34 |
| Subsystem | forks front |
| Listed in parts books | 1964–1967 |
FORK NUT 26TPI CHRM 63-67
Chrome fork top nut, 26 TPI thread, for Triumph telescopic forks, 1964-1967.
This is the fork top nut, 26 TPI, in chrome finish, threaded into the top of the fork tube on Triumph telescopic front forks. It's listed for 1964 through 1967 in the catalog, and it shows up across a range of fork figures for models including the TR6, T120, T90, T100, and the T20SS/T20SH, so this thread pitch and nut were used broadly across the Triumph line in those years. The old alias for this one is H1658, if that's what's printed in your parts book.
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The fork top nut caps the fork tube and keeps the internals sealed at the top of the leg, so it takes some wear and weathering over the years - chrome can pit, and the threads can gall if someone's been careless with a wrench. If you're restoring a fork assembly from this era it's a straightforward swap.
Given the years and figures it appears in, best to check your existing nut's thread and confirm it's the 26 TPI type before ordering, since Triumph changed fork specs across other years not covered here.
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