| Diagram | Fig. 1 — CYLINDER AND CRANKSHAFT · ref 5 |
| Subsystem | engine bottom |
| Listed in parts books | 1969 |
BSA Washer, heat sink and steady stay (5/16" × 5/8" × 1/16")
A 5/16 x 5/8 x 1/16 inch flat washer used as a heat sink and steady stay washer across numerous 1969-era assemblies.
This is a plain flat washer, 5/16 inch by 5/8 inch by 1/16 inch, listed in the catalog as a heat sink and steady stay washer. It's a small hardware item that shows up across a wide range of assemblies rather than being tied to one specific job — the parts book lists it wherever a washer of this size was needed to spread load or add a bit of clearance under a nut or bolt head.
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Because it appears in so many different figures, from the cylinder and crankcase area to fork, wheel, mudguard, tank, and electrical fittings, think of this as a general-purpose washer that the factory used in a number of places rather than a part built for one single function. If you're chasing down a specific assembly, check the fastener it sits under and match by size rather than by figure name.
We don't have more detail on this one beyond the size and the fact it turns up all over the bike in the 1969 catalog listings. If you're not sure it's the right washer for your application, bring in the old one or call the shop and we'll confirm before you order.
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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