On Saturday, 18 July 2020 09:28:58 UTC+1, Andy Bennet wrote:
On 18/07/2020 01:22, John Rumm wrote:
So there I am with a pack of M12 flange nuts and lots of threaded rod,
and I need an 18mm spanner...

Except the first set I try goes from 17mm to 19mm, so I look at my
socket set, same. Another socket set, same. The deep socket set included
with the pneumatic impact wrench, same again!

Had to use an adjustable in the end!




An M12 nut is *supposed to be* 19mm across the flats, don't see why a
flanged nut should be different?

This link suggests that the ISO standard is 18mm:

https://amesweb.info/Fasteners/Nut/M...ons-Chart.aspx

This link suggests that the ISO standard is, as above, 18mm, but the DIN standard is 19mm.

https://www.fastenerdata.co.uk/techn...omparison.html

As does Wiki:

https://en.wikipedia.org/wiki/ISO_metric_screw_thread