PLUGS, Aerial, Single No. C1 (ZA/CAN 1480)

[Grant Bowker]

Originally Posted by David Dunlop

It is mounted to a No. 10 ring terminal by means of a 4BA x 3/8 inch, Cheese Head screw and internal toothed lock washer.
.........at least locally here in Canada is not many shops would carry BA tap and die sets in their inventory any more.

Fully agreed that not many Canadian machine shops will regularly work in BA threads. Some BA threads are close to current metric threading, not perfect but "will fit". The ones I'm thinking of are a little off, loose so I wouldn't trust them for high torque but a much better fit than either coarse or fine SAE.