| Also known as | S581 |
| Diagram | Fig. 16 — SWINGING FORK, SUSPENSION UNITS AND CHAINGUARD · ref 31 |
| Subsystem | primary |
| Listed in parts books | 1967–1970 |
Bolt, C-range
A C-range hex bolt used in the swinging fork, rear suspension, and chainguard assembly area.
This is a C-range bolt, Triumph part number 21-0581, also cataloged under the older S581 designation. In the parts books it shows up in the swinging fork and suspension unit section, alongside the chainguard listings, so it's one of the small fasteners that hold the rear suspension and chainguard hardware together.
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It's a plain hex bolt rather than anything specialized, the kind of piece that's easy to lose track of when a swingarm or shock mount comes apart for service. The catalog record ties it to machines built between 1967 and 1970, though we'd confirm exact fitment against your bike before ordering since these bolts get used in more than one spot.
If you're rebuilding the rear end or chainguard mounts and need to replace a worn or rounded-off bolt, this is the one the books call for in that area. Keep the old one on hand for comparison if you're not sure it's an exact match.
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