Here is a graphic that shows that there is a small, very limited amount of interchangeability between metric, AF and Whitworth wrenches (also spanners and sockets).
Of course, it is always best practice to use the correct tool for the job, however, there are occasions where you may not be able to lay your hands on the right wrench size, and you have an equivalent that fits.
It is also possible that a nut or bolt may be heavily worn or damaged, so downsizing a little may give you a more snug, tighter fit on the flats.
Here is a chart that highlights where there is some interchangeability between different types of wrenches/spanners/sockets.
This is also available as a PDF download in case you want to print it out to keep handy in your workshop!
This article is from a series of Handy Workshop Guides I have put together.
These may be of interest to you:
Categories: Handy Workshop Guides, motorcycles, Tech Articles
Hello, I’m well equipped with metric and AF spanners and sockets and was wondering whether I really needed to add Whitworth for the series Land Rover I recently acquired. Your chart has been invaluable and I’m now on the hunt for a good set of Whitworth spanners.
I appreciate the effort you’ve made to compile the chart and publish it here, thank you.
Thanks so much for your kind words Andrew!
Feedback like that makes it all worthwhile!
There is a lot of whit and bsf on the older landy.
While a lot of the industry moved to UNF/UNC in the 60s, the threads on the engine parts and especially the gearbox came a little later.
G’day. I brought my restored 62 650SS back to Australia from the UK in 2023. I had to have a back rebuild (5 discs then 5 vertebrae and my pelvis fused) so I have only ridden her a few times but spent the time just appreciating the engineering and getting myself a set of Whitworth spanners and sockets, mostly from Gumtree and Facebook Marketplace. The demand isn’t high in Australia, so I tag them when they appear and monitor then offer down bids once they realise selling them is based on low demand. Of course, there are village idiots who demand $20 and upwards per spanner. The mancave where she lives is all setup. The second thing I hung on the wall was this list, invaluable, Thank you. Cheers from Australia
Thank you so much for your kind words Steve!
The 650ss is my favourite – by far the best frame, coupled to a legendary engine!