| Diagram | Fig. 22 — FRONT WHEEL |
| Subsystem | wheels |
| Listed in parts books | 1980 |
BOLT DISC/HUB TRIUMPH T140D - 5/16-24 unf 4 1/2 UH (6 REQ) FRONT WHEEL
Front disc-to-hub mounting bolt for the Triumph T140D, 5/16-24 UNF, six required per wheel.
This is the bolt that fastens the front brake disc to the front wheel hub on the T140D. It's cut 5/16-24 UNF, which is the fine thread standard Triumph used on this hardware, and the catalog calls for six of them per wheel to secure the disc properly. Since it's part number 21-7042 for the T140D front wheel, it's a specific length item, not a generic hardware-store bolt.
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If you're rebuilding a front hub or swapping a disc, these are worth replacing as a set rather than mixing old and new, since disc/hub bolts take a fair amount of stress and vibration in service. We don't have a lot of catalog history behind this one, but the description is specific enough to know exactly what it is and where it goes.
Check your existing bolts for thread wear or corrosion before reinstalling a disc, and give us a call if you're not sure how many you need for your particular hub setup.
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