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3/4" x 20 is UNEF so it can't be UNF as 3/4" UNF is 16 tpi.

[URL unfurl="true"]https://www.trfastenings.com/knowledge-base/thread-geometries/unified-extra-fine-unef[/URL]

[URL unfurl="true"]https://armpremfg.com/unf-thread-size-chart/#:~:text=UNF%20threads%2C%20unlike%20UNC%20threads,covers%20of%20metal%2Dshelled%20flashlights.[/URL]

Andover Norton referring to a UNEF part as UNF doesn't entirely surprise me. The Massey Ferguson I can't comment on only that it has to be wrong.

[URL unfurl="true"]https://www.britishmotorcycleparts.co.nz/product/21-0585/[/URL]


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