Boring head thread?

[nigel jones 5Participant @nigeljones5]

I have two boring heads, one has a 1 1/2! dia thread for the arbour (which I have)and the other, sold online as a 'silver' boring head has a much narrower thread. I only have the head, anyone know what thread I need for the arbour? I could measure it but I still wont know what thread it is?

[nigel jones 5Participant @nigeljones5]

[Nick_GParticipant @nick_g]

.

The 1 1/2" will be an 18tpi

But that is not what you need to know is it. And the way I read your post it's the smaller one that you need to know.?

Nick

[nigel jones 5Participant @nigeljones5]

It is, I recon its 7/8 x 20, does this seem correct? thanks

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