Looking for UNF fasteners I came across A&J fasteners on eBay.
Much cheaper than any others I found and worth looking at the price for 100. For a couple of things I wanted it was less than £1 to increase the quantity from 50 to 100.

Having removed the steering box from my LW, it was apparent that the bolts were random, except for the locking plate ones and the ones that go into the back of the steering box itself. I was wondering where one finds the actual bolt size from the parts numbers. I was in a local Landy place this morning and he was referring to the parts book then looking up. I would like to replace the old, and sometimes sheared ones, with new, but accurate imperial stuff.

Sean you'll want the rover 1 parts book 60595, we have a copy on the club site. https://landrover.series2club.co.uk/parts-and-owners-manuals/ It gives you the description of the part (bolt size & material) along with the part number.
Fair warning the diagrams are mostly inaccurate.
Blanchards have a physical copy but it's a modern reprint of that pdf.

Learning how to measure threads is a very useful skill to have.
All you need is a calliper to measure the bolt diameter, some thread gauges, and a small yellow Zeus book.

As for the steering box they have a mix of UNF and UNC threads I think. The course UNC threads screw into the cast aluminium threads and the bolts with nuts on the other side are the finer UNF threads.

To measure a bolt just measure across the thread diameter and decide what is closest. A 1/2" thread will not measure 1/2" but be slightly smaller, maybe 0.495" or something. You then need to stick your thread gauges in the threads to work out the threads per inch. (TPI) Once you have that information, simply look it up in the Zeus book. A 1/2" UNF thread has 20TPi and a 1/2" UNC thread only has 13TPI. That may not be needed though as the difference between UNF threads and UNC threads is obvious at a glance.

Metric threads use exactly the same method except measure the thread in millimetres and then the pitch is measured in millimetres between each thread. A standard M8 bolt will measure 7.90ish across the threads and have a pitch of 1.25mm. If you can't measure 1.25mm with a ruler, measure ten threads and off course that will 12.5mm

For measuring BSW and BSF threads, use exactly the same method as UNF and UNC threads above. The only difference is the angle the threads are cut is 55° against the imperial and metric 60° thread angle. You can get BSF and BSW thread gauges off course cut at the correct 55° angle.

After you've been doing it a while you will be able to spot them straight away. I can sift through a random box of bolts and arrange them all into piles of metric, UNF and UNC without measuring anything. Harder to spot BSF mixed in with UNF and BSW mixed in with UNC though, may need the measuring tools for them.

Thank you both for such useful information. It is very helpful.  I am sure a lot of people elect to go metric but it would be nice to get the imperial. Fortunately the unc that ho into the steering box are ok. Just need a clean of the threads. The two small 5/16 (i think) joined by the lock plate might be okay, too.
I may have to go and challenge my local fasteners guy. I do teach his daughter, so that might help.

I must be being really thick. I can't find the Parts books with that part number at all on the club site. What's the actual title, please?
Thanks

Quote from: Space-Kook on May 20, 2024, 02:39 PMSean you'll want the rover 1 parts book 60595, we have a copy on the club site. https://landrover.series2club.co.uk/parts-and-owners-manuals/ It gives you the description of the part (bolt size & material) along with the part number.
Fair warning the diagrams are mostly inaccurate.
Blanchards have a physical copy but it's a modern reprint of that pdf.

Quote from: Seanlandy on May 21, 2024, 02:49 PMI must be being really thick. I can't find the Parts books with that part number at all on the club site. What's the actual title, please?
Thanks

Quote from: Space-Kook on May 20, 2024, 02:39 PMSean you'll want the rover 1 parts book 60595, we have a copy on the club site. https://landrover.series2club.co.uk/parts-and-owners-manuals/ It gives you the description of the part (bolt size & material) along with the part number.
Fair warning the diagrams are mostly inaccurate.
Blanchards have a physical copy but it's a modern reprint of that pdf.

MoD 0.5Ton 4×4 ROVER 1 Parts Series IIA.pdf

Make sure you have selected the military technical library at the top of the page.

As I said Me being thick thanks. Went straight to it. Thank you!

It's also extremely useful for identifying bearings and seals.