32 tpi, 60°

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Edit: More detail here

Edited By Michael Gilligan on 16/03/2016 11:28:43

The only important bit is the 32 – set the gearbox/change wheels for 32 threads per inch.

You can look up the major diameter and minor diameter in tables easily found on the web. Depth =major-minor/2.

Either grind your own tool or get one with a suitable profile, which is based on a 60-devree vee with a rounded end.

Neil

What material are you using for the mandrel, Ed? I cringe at the force I have to use with some of my M4 Rivnuts. I keep telling myself "it's going to break, it's going to break" … but it hasn't yet!

Roger

Jesus,

£99 for a fancy allen key and screw ?????????????

And stand there all day winding ?????????????????????

Wouldn't work for me, most of my Rivit nuts go into closed spaces so you can't see how much it's compressed.

You need a tool that snaps off at the right tension.

Anything up to M6 the modern battery drills with a clutch manage these very well and very fast.

Edited By John Stevenson on 17/03/2016 00:06:08

Nicholas, yes, the tool brand is Avdel, and as you say, is essentially like a pop-riveter with 300mm handles. But I don't see how the tool itself can be faulted – the adjustment and the action are free, and it seems to me that the problem is simply the amount of force that is required to collapse some of the inserts. The inserts are supposed to be genuine product, purchased over the last 20 – 30 years. But I sure do worry about that M4 mandrel.

Roger