| Also known as | 24-978 |
| Diagram | Fig. 1 — CYLINDER HEAD · ref 45 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1972 |
BSA Spring washer, heat shield—first sets—U.S.A. (1/4" × 7/16" × .040")
A small spring washer, 1/4" x 7/16" x .040", used with heat shield fittings on U.S.A.-spec machines.
This is a spring washer, listed in the catalog as sized 1/4" x 7/16" x .040", used with heat shield fitment on U.S.A.-spec machines. It shows up under the older alias 24-978 as well as the current 24-0978 number, so if you're working from an earlier parts book you may see it printed either way.
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Spring washers like this one go under a fastener head to keep tension on the joint as things heat and cool, which matters on a part sitting near a heat shield. This one turns up across a wide spread of figures in the catalog — cylinder head, inner timing cover and gearchange mechanism, electrical equipment plates, and the oil tank/sidecover/silencer figure — which tells you it's a general-purpose hardware item rather than something tied to one single assembly.
Given how many different figures list it, don't assume this is only a heat-shield part just because that's the description on the line — check your parts book figure to confirm which fastener on your bike this washer is meant to back up before ordering.
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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