| Also known as | T1150 |
| Diagram | Fig. 2 — CRANKCASE · ref 28 |
| Subsystem | engine bottom |
| Listed in parts books | 1963–1964, 1967, 1969–1972 |
SCREW,INSPECTION PLATE T20
Inspection plate screw for Triumph engine/gearbox covers, catalog number 57-1150 (older number 70-8177).
This is the inspection plate screw listed under Triumph part number 57-1150, with the older factory number showing up in some catalogs as 70-8177 and the legacy alias T1150. It shows up across catalog entries tied to the crankcase and gearbox areas, where inspection plates cover openings for checking or accessing internals without splitting the cases.
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An inspection plate screw like this one is a small fastener, but if it strips or snaps off flush it can turn a two-minute check into a bigger job, so it is worth keeping a few spares in the drawer.
The catalog record ties this part to multiple figure titles spanning crankcase and gearbox work, which tells us it is used in more than one location on the engine or gearbox rather than a single fixed spot. If you are matching up an old plate screw, bring it to the counter and we will confirm which one you need.
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