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The 100 Forum

What size are the relay terminal screws?

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Luegolover Avatar
Luegolover Steve L
London, London, UK   GBR
I feel like I'm asking lots of petty questions so forgive me if they are annoying you.

I have renovated the relays but need to replace some of the little screws that hold the terminals on but I don't know the size or thread type for them. My thread measuring device is limited at best but it looks like it is a No6 however, I have little faith in it so I thought I'd ask you. I did look in the parts manual and the service manual but didn't find anything helpful.

Does anybody know this?

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rusty1c Avatar
rusty1c Peter D
Antioch, CA, USA   USA
1961 Austin-Healey 3000 BT7 "RUBY"
1963 Chevrolet C10 "Rusty"
Steve,
I believe they are either a #6 or #8 with a 32 thread count.

spinaway Des Spillane
Timaru, Canterbury, New Zealand   NZL
1954 Austin-Healey 100 "Fred"
Hi Steve
I have my Overdrive relays on the bench at the moment and as per many Lucas parts of that era these are BA thread.
Its 4BA for that terminal screw, and I just put a 4BA tap thru the holes to double check.

Since you live in the land of BA, you should be able to buy easy. Model engineers also use BA quite a bit still, and where I am I normally source BA fasteners off local model engineer suppliers.
With a BN1 you certainly benefit from having a 2BA and a 4BA tap and die handy
.
Regards

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