I bought an old trailer the other week and during the handover noticed one of the axle nuts was missing. The seller seemed genuinely surprised it wasn't there - especially since he'd been using the trailer regularly.
Anyway, being a cautious type, I decided to just take the wheel away after paying for it and planned to return with a suitable nut.
I couldn't find one and just drilled the axle and put a split-pin in it to get me home (5 miles) but an still hunting for the right nut.
I convinced myself it was 1" BSF (10TPI) but after getting the other nut off tonight to examine it am thinking it's 1" BSW (8TPI)
Anyway the point of this post is...
Do the 6 triangles stamped on the outer face indicate anything? Like BSW for example.
I know that on UNC/UNF fasteners (when they were a new thing) there were rings stamped or cast on them for easy identification (well My Rootes parts list says that's the case) so was thinking this may also be an ID thing.
NB if I could find my screw-pitch gauge I wouldn't need to be guessing and measuring with rulers/verniers but that's all I had tonight
trailer axle has a very coarse 1" thread on it
initial check of pitch looked like 0.1" so 10TPI
AF size corresponds with 1" BSF nuts for sale online
1 1/2" AF spanner is a loose fit
nut from other end of axle has weird stamping on it
looks like pitch is about 3mm or 1/8", not 2.5mm or 1/10" as I originally thought