| Diagram | Fig. 2 — CARBURETOR AND AIR CLEANER · ref 1 |
| Subsystem | fuel |
| Listed in parts books | 1968, 1970–1974 |
| Also fits (as replacement) | 1968–1970, 1975–1980, 1983 · for 99-0521 |
SCREW FLOAT CHAMBER AND TOP COVER MK1 - (2BA Posidrive x .590 long) Replaces 19-3093, 40-0236, 622/170, 99-0521
2BA Posidrive screw, .590 in. long, for the Amal Concentric float chamber and top cover.
This is the small screw Amal used to hold the float chamber and top cover together on the Concentric carburetor, catalog number 622/086. It's a 2BA Posidrive screw, .590 inch long, and it shows up across a long run of Amal Concentric fitments in our catalog data, from the T90/T100/T100C carburetor figures through the TR6R, TR6C, T120R, and T140V listings.
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These are cheap to lose track of and easy to strip if someone's been at them with the wrong driver, so if you're rebuilding a Concentric top end or float bowl, it's worth grabbing a few spares rather than reusing tired ones. The catalog shows this number replacing several older factory part numbers, so if your old carb parts book lists 19-3093, 40-0236, 622/170, or 99-0521, that's the same screw under an earlier number.
We don't have anything unusual to flag on fitment beyond what's listed — it's a common small hardware item across a wide span of Concentric-equipped Triumphs in the parts books, so double check the head style and length against what's currently in your carb before ordering a bag of these.
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