Triumph BSA T120 T140 T150 A65 A75 B50 Billet Fork Top Nuts 1971-82 US Made 20TPI PN# 97-4395 B 97-4258 B 97-4387 B


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Lovely billet alloy fork top nuts for 1971-1982 BSA and Triumph 650 and 750 models. 1971-1972 BSA B50. Made for us here in the USA to exacting standards from solid billet aluminum, there are none nicer!

These fork top nuts are manufactured in the U.S. for The Bonneville Shop and are threaded to fit the internal-spring forks from 1971-1982. 20 TPI. The one-piece fork top nuts have the extended tip to locate the internal spring. They are tightened down using a large spanner and seal the fork oil in the fork tube and secure the instrument mounting brackets.

The fit the following:

  • 1971-1972 BSA B50 models
  • 1971-1982 BSA 
  • Triumph 650 and 750 models

These fork top nuts are of the one-piece design that was originally used on the 1971-1972 oil-in-frame 650 models. They are made from billet alloy and do not have the shallow recess on the top for the decal. Sold in pairs, replaces OEM PN# 97-4258 97-4395 & 97-4387 and yes, these do replace both the inner and outer fork top nut on disc brake Triumph forks for a cleaner and easier installation!

IMPORTANT NOTE: These top fork nuts are 20 TPI with thread OD 7/8th” (.874″). Check the TPI of your forks before purchase to ensure fitment of these top nuts. See recommend links for a thread pitch gauge.




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