| Also known as | 40-942 |
| Diagram | Fig. 1 — CYLINDER AND CRANKSHAFT · ref 77 |
| Subsystem | engine bottom |
| Listed in parts books | 1969 |
BSA Stud, cylinder head, dowel position (1/4" B.S.C./B.S.F. × 2-11/16")
A 1/4 inch B.S.C./B.S.F. cylinder head dowel stud, 2-11/16 inches long, from the cylinder and crankshaft section of the parts book.
This is a cylinder head stud, the dowel-position type, used to align the head correctly on the barrel before the rest of the fasteners go in. The catalog lists it as 1/4 inch B.S.C./B.S.F. thread with a length of 2-11/16 inches, and it shows up in the CYLINDER AND CRANKSHAFT section of the parts book. The 40-942 alias is just the same part number written without the leading zero, so if you find it printed that way in an older list, it's this same stud.
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The catalog only tags this appearing once, with a 1969 date on it, so we don't have a broad model spread to point to. If you're rebuilding a top end and need to know it's the right stud for your dowel position, best to check thread and length against what's already in your barrel before you order.
Give the shop a call if you want us to confirm fitment against your specific engine before it ships out.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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