| Also known as | S590 |
| Diagram | Fig. 29 — SPEEDOMETER AND TACHOMETER · ref 8 |
| Subsystem | electrical |
| Listed in parts books | 1967–1970, 1974 |
Bolt (1 1/4 in. U.H.)
Bolt for mounting the speedometer and tachometer bracket on Triumphs, PN 21-0590 (also S590).
This is a bolt used to mount the speedometer and tachometer bracket on Triumphs, catalog number 21-0590, also known under the earlier form S590. The parts book lists it plainly as a 1 1/4 in. U.H. bolt, and it shows up across catalog entries from 1967 through 1974 in the speedometer/tach figures.
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On bikes with the dual instrument setup, this is the fastener holding the bracket that carries both gauges up on the top yoke or headlamp bracket area. It's a small item but a common one to lose track of or strip out when swapping instruments or brackets, so it's worth having a spare or two in the parts drawer.
If you're chasing down the right bolt for your speedo/tach bracket and the length or thread doesn't look right when you compare it to what's currently on the bike, give us a call and we'll help sort out which one you need.
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