Use spanners for the size intended.

In the long run probably better to get some metric nut spinners rather than round off your nuts. If you want to use BA on the metric then why not just try what you have and make a not of what fits what as spanners and spinners can vary in size a bit.

I find these metric spinners nice to use and the OD of the "socket" is not too large. SW is the A/F. They also have smaller ones down to 1mm.

If you look at these spinners from Model Fixings they list the metric, BA and UNC hex that each size fits but there are not many BA ones that fit

Edited By JasonB on 01/09/2022 09:49:59

Hi all, many years ago I made spiders & double ended nut runners based on cap screws of the appropriate sizes in metric & imperial sizes & with hindsight they lasted for decades & are now parked in screws on my small lathe poised & ready to spring into action, ( unlike me), fit like a glove & really only a few minutes work to make.

Bob H

https://cpc.farnell.com/duratool/d03445/nut-driver-set-7pc/dp/TL21107

Quality is fine for my requirements for not too many ££s. Although the P&P cranks the cost up if you come below the 'Free P&P' threshold.

D.

just measure the jaws

I managed OK before they had the English version of their site and my German is pants too.

I do have the Expo ones bought at a show but like the Farnell ones linked to above have quite large OD ends which on small engines can restrict access. Also be aware that the Expo BA set is actually supplied as metric with a couple of them fitting BA, at least mine was.

Although I have a good selection of Whitworth, BA, AF, Metric spanners and sockets, and even my dad's old magneto spanners, I also have a selection of adjustable and stilson spanners. I know it will upset some but I don't have a problem using adjustable spanners, especially on small sizes.
I grew up on a farm and it was often necessary to use what was in a tractor toolbox, rather than waste time going back to a workshop, At times I would make available spanners fit by filling the gap with a flat screwdriver, or thin spanner.
Some of my spanners have been modified by previous owners e.g, a 3/8 Whit that is enlarged to 3/4 AF. i guess a previous owner was short of a 3/4 spanner. The only one that hangs on my spanner wall that I remember modifying is a 3/16 combination spanner that has the ring bent at 90deg., used when I didn't have a deep enough socket.
Just incase I give the impression of being a metal butcher, I was using 2BA bolts this afternoon, I had a 2BA spanner on one end and a 2BA box spanner on the other end.