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Deleted member 1183
Note these are much more spendy than the plain black unplated (and rust prone) ones, though...
Fastenal.com
(lengths based on Lee's kind research)
M12 x 1.25 x 55mm 10.9 yellow zinc cap screw
M12-1.25 x 55mm DIN 960 Class 10.9 Yellow Zinc Cap Screw | Fastenal
M12 x 1.25 x 70mm 10.9 yellow zinc cap screw
M12-1.25 x 70mm DIN 960 Class 10.9 Yellow Zinc Cap Screw | Fastenal
M12 x 1.25 x 90mm 10.9 yellow zinc cap screw
M12-1.25 x 90mm DIN 960 Class 10.9 Yellow Zinc Cap Screw | Fastenal
They have a bunch of branches in the UK
View attachment 10884
Thanks for the link LBS. I will work on that now and will let you know how I get on.