| Diagram | Fig. 10 — CLUTCH · ref 22 |
| Subsystem | primary |
| Listed in parts books | 1960–1962, 1964–1972 |
Key
A woodruff key from the clutch/gearbox area that locks a gear or component to its shaft.
S66-1 is a woodruff key used in the clutch and gearbox area, showing up in the clutch and gearbox shafts/gears figures across a long catalog run from 1960 to 1972. A woodruff key like this seats into a shaft slot and locks a gear or sprocket to the shaft so it can't spin independently - in this case it's part of keeping components on the gearbox mainshaft turning together as they should.
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This part shows up in twenty-six catalog rows across that span, which tells you it's a common wear item that got specified over and over rather than a one-off. The factory later renumbered it to 60-4253, so if your parts book or an older shop invoice shows that number, it's the same physical piece.
Given how many catalog appearances this key has, it's worth having a couple on hand if you're into the gearbox or clutch for other work. Confirm against your own parts book before ordering since fitment across this length of catalog history can vary by exact application.
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