| Also known as | F7389 |
| Diagram | Fig. 17 — MOTOR UNIT FITTINGS AND FOOTRESTS · ref 26 |
| Subsystem | frame |
| Listed in parts books | 1967–1974 |
NUT, SHOULDERED ENGINE MOUNT - 7/16-20
Shouldered 7/16-20 nut used on unit-construction Triumph engine mounting plates.
This is the shouldered nut Triumph specified for the engine mount studs on unit-construction engine plates, thread size 7/16-20. The shoulder is what sets it apart from a plain nut — it locates against the plate and stud so the mounting joint stays put once torqued down rather than relying on friction alone. The catalog also lists this part under the older F7389 number, which is the form you would see printed in an earlier parts book.
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The figure this comes out of is the engine unit fitting and footrests section, so it lives right where the engine bolts into the frame plates rather than out at the swingarm or elsewhere on the chassis. If you're pulling the engine or doing plate work on a unit twin, it's worth checking these nuts for wear since a shouldered nut that's lost its shoulder register won't clamp the same way.
We show this appearing in one catalog listing tied to 1970, so treat that as the documented range in our records rather than a broader fitment claim. If you're not sure your bike takes this exact nut, give us a call with your frame or engine number and we'll confirm before you order.
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