| Diagram | Fig. 3 — CRANKCASE · ref 64 |
| Listed in parts books | 1969–1970 |
BSA Stud, oil pipe union (5/16" Unified Fine/Coarse × 1 7/8")
A 5/16 in. x 1 7/8 in. stud with Unified Fine and Unified Coarse threads, used for an oil pipe union.
This is a stud used for an oil pipe union, 5/16 inch diameter by 1 7/8 inch long, threaded Unified Fine on one end and Unified Coarse on the other. Studs like this let you bolt an oil line union down solid on one side while threading into a tapped hole on the other, which is why you'll see the two different thread standards on the same piece of hardware.
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Our catalog record shows this stud turning up in crankcase and gearchange mechanism listings from 1969 to 1970. If you're chasing an oil pipe union stud for a job in that era of parts book, this is worth checking against your own crankcase or gearchange drawings before you order, since the same number shows up across a couple of different assemblies in our records.
It's plain hardware, no finish or material called out in our listing, so if you need something specific on that front give the shop a call and we'll see what we can confirm.
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