1971 OIF Thread.

[A10 JWO]

Every thread on my A65 is shown as Uni-thread. However the oil feed pipe is held on with a 5/16" Whitworth bolt according to my parts list..21-1973. Can anyone confirm please.

[AWJDThumper]

My 1971 parts book shows it as 21-1973 5/16" UNC!

[A10 JWO]

I have looked at Dragonflys list and they claim it is Whitworth . Don't want to damage anything. Will test both gingerly. Thanks for response.

[AWJDThumper]

It's been 5/16 since at least 1969 when BSA changed to unified threads - Dragonfly are simply wrong! Also, both 5/16 BSW and 5/16 UNC are 18 tpi and therefore, to all intents and purposes, identical.

[A10 JWO]

Thanks Thumper.