| Diagram | SWINGING ARM, CENTRE STAND, REAR BRAKE CONTROL |
| Subsystem | suspension rear |
| Listed in parts books | Not catalogued by year yet |
Security bolt, swinging arm (9/16" Unified Fine × 10 3/16")
Swinging arm pivot security bolt, 9/16 in. Unified Fine thread, 10 3/16 in. long.
This is the security bolt for the swinging arm pivot, the long bolt that runs through the pivot assembly and keeps the rear fork located to the frame. It's a fastener, not a bushing or spindle, so its job is clamping the pivot together rather than acting as the bearing surface itself. The catalog lists it under the SWINGING ARM figure, alongside centre stand and rear brake control entries, which is normal since those figures often share a page in the parts books.
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The listing gives a thread of 9/16 inch Unified Fine and a length of 10 3/16 inches, so if you're checking an old bolt against this one, that's what to measure against. Our records only show this part turning up once, tied to 1970, so we don't have a broader run of years to point to beyond that.
If you're rebuilding a swinging arm pivot, this is a bolt worth replacing rather than reusing if it's worn, bent, or the threads are suspect, since it's a structural fastener holding the rear end together. Give us a call if you want to confirm it matches what's on your bike before ordering.
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