| Diagram | CHAINCASE AND CHAINS |
| Subsystem | primary |
| Listed in parts books | Not catalogued by year yet |
Screw
A chaincase screw, Triumph part 57-4646, later renumbered to 82-4129.
This is a screw listed under Triumph part number 57-4646, appearing in the CHAINCASE AND CHAINS section of the parts book. It shows up in a single catalog entry tied to the 1973 model year, which tells us where it lived in the lineup but not much beyond that.
Read more
The factory eventually renumbered this screw to 82-4129, so if you're working from a later parts book or cross-referencing a newer catalog, that's the number you'll find it under now. Both numbers point to the same physical part.
Beyond its home in the chaincase assembly, the catalog record doesn't give us more detail on this one. If you're trying to match it up exactly, bring in the old one or check against your bike before ordering.
Sorry if we got something wrong here. If you think this information isn't correct, .