| Also known as | 99-3518 |
| Diagram | Fig. 15 — EXHAUST PIPES AND SILENCERS · ref 21 |
| Subsystem | exhaust |
| Listed in parts books | 1964–1968 |
BOLT SILENCER BRACKET 5/16-26CEI UH 7/8
Silencer bracket bolt, 5/16-26 CEI thread, 7/8 inch under-head length, used on unit Triumph twin exhaust mounts.
DS58 is the bolt that secures the silencer bracket on unit-construction Triumph twins, sized 5/16-26 CEI thread with an under-head length of 7/8 inch. It shows up in the parts books under the exhaust pipes and silencers listings as well as frame and footrest fitting sections, which tells you this is a bolt that ties the muffler mounting hardware back to the frame or footrest lug rather than something buried in the engine.
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The catalog appearances span TR6R and T120R figures from the mid-to-late 1960s, so if you're working on a bike from that era and need to replace a worn or rusted bracket bolt, this is the one to check against your parts book. It later carried forward under the number 99-3518, so if you're cross-referencing an older book against a newer one, both numbers point to the same bolt.
It's a small, plain piece of hardware, but exhaust bracket bolts take a lot of vibration and heat cycling over the years, so it's common for the originals to be stretched, rusted, or just plain seized by the time you're pulling a silencer off. Worth having a couple on hand before you start pulling exhaust hardware apart.
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