| Also known as | T1047 |
| Diagram | Fig. 10 — CLUTCH · ref 25 |
| Subsystem | primary |
| Listed in parts books | 1960–1962, 1964–1967 |
| Also fits (as replacement) | 1969–1972 · for 68-3320 |
Clutch securing nut
Clutch securing nut for the clutch hub center on the gearbox mainshaft, cataloged 1960-1967, older number 68-3320.
57-1047 is the clutch securing nut, the nut that holds the clutch hub center down on the gearbox mainshaft. It lives in the primary/clutch assembly and is what keeps the whole clutch stack clamped in place on the end of the shaft.
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This one shows up across catalog listings from 1960 through 1967, and it carries the older factory number 68-3320 before it was renumbered to 57-1047 - if your parts book or an old parts bag shows 68-3320 or the legacy T1047 stamp, that is the same nut. It appears in a dozen catalog rows over that span, so it was a long-running part before the later hub nut design took over.
If you are pulling a clutch apart for inspection, this is a nut worth having on hand - it takes some torque and abuse coming off, and reusing a tired one is asking for trouble down the line. Confirm which hub nut your particular clutch center takes before ordering, since Triumph changed this design over the years.
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