| Diagram | Fig. 5 — OIL PUMP, GEARBOX SPROCKET · ref 2 |
| Subsystem | gearbox |
| Listed in parts books | 1969–1972 |
BSA Nut, gearbox
A gearbox nut used in the gear cluster and sprocket area of the transmission, cataloged 1969-1972.
This is a gearbox nut, part number 40-3051, showing up in the parts books across gear cluster and camshaft figures as well as the oil pump and gearbox sprocket layouts. It's a small fastener but it lives in a busy part of the transmission, and the catalog record ties it to the gear cluster and sprocket area rather than telling us much beyond that.
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The catalog appearances run from 1969 through 1972, and it turns up in seven separate listings across those gearbox drawings, which tells you it's a component used more than once in that assembly rather than a one-off. Beyond that, we don't have more detail on this one — no thread size, material, or side-specific note is given in our records.
If you're rebuilding a gearbox from this era and need this nut, best to have the gearbox open or the old part in hand to compare before ordering, since we can't confirm exact fitment specs from what's on file.
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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