| Also known as | 40-483 |
| Diagram | CYLINDER HEAD |
| Subsystem | engine top |
| Listed in parts books | Not catalogued by year yet |
Stud nut, cylinder head (3/8" British Standard Cycle)
3/8 inch BSC cylinder head stud nut for Triumph engine top end work, 1969-1972 catalog appearances.
This is a cylinder head stud nut, 3/8 inch British Standard Cycle thread, used where the head fastens down onto the cylinder barrel. It shows up in the catalog under the CYLINDER HEAD and CYLINDER HEAD - ROCKERS figures, which is exactly where you'd expect a head stud nut to live.
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The catalog places this part across appearances from 1969 to 1972, though the exact model fitment isn't spelled out in our records beyond that. If you're rebuilding a top end and pulling head studs, it's worth checking your nuts for thread wear or corrosion since these get heated and torqued repeatedly over the life of the engine.
You'll also see this part referenced under the older number formats 40-483 and 40-0483 with an asterisk - same physical nut, just different catalog notations from different print runs.
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