| Also known as | S1908 |
| Diagram | Fig. 16 — FRAME · ref 14 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1972, 1974, 1976–1980, 1983, 1985 |
NUT CASE STUD TO OIL JUNCTION BLOCK - UNF 1970-ON
UNF nut that secures the case stud to the oil junction block on later unit-construction Triumph twins.
This is the nut that secures the case stud where it meets the oil junction block, a small fastener but one that matters for keeping oil pressure where it belongs. The catalog lists it under a UNF thread spec, and it shows up in the parts books alongside exhaust pipe and muffler diagrams for the TR6C and T120R/TR6R, which is just how Triumph grouped that page rather than a sign the nut lives in the exhaust system itself.
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The legacy number for this one is S1908, so if you're working from an older parts book and see that reference, it's the same nut as 21-1908 in the current numbering.
It's a cheap enough part that keeping a couple in the drawer isn't a bad habit, since these have a way of going missing or getting buggered up during teardown.
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