| Diagram | Fig. 4 — Engine: Crankcases, Crankcase Breather, Tachometer Drive · ref 25 |
| Subsystem | engine bottom |
| Listed in parts books | 1975 |
Norton Stud, Crankcase Top Front
Top front crankcase stud for Norton engines, 1975 catalog listing.
This is a crankcase stud, the top front position, from the engine bottom end area covered in the crankcases and breather section of the parts book. It's a Norton part, not Triumph, despite showing up in a Triumph-adjacent numbering scheme some shops use for cross-reference purposes.
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A stud like this holds the crankcase halves together (or secures whatever's mounted on top of the case at that point) and gets torqued down with a nut on the exposed end. The catalog only shows this one appearing for the 1975 model year, so that's the extent of what we can confirm on fitment.
If you're chasing this for a rebuild, check thread condition closely before reusing it — a stripped or corroded stud in this position is a common enough headache. Call the shop if you want us to confirm it matches what's in your case before you order.
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