Just idle curiosity, Steve but is it threaded BSF ?

Hi Rik, looks like Whitworth, got it from Stratford jumble last week for £1,have got about half a dozen more, will try to dig them out and see if any of them have BSF threads.

Motor-Cycle products were only a small part of Dunlops war production,Dunlop Universal Tyres,inner tubes,rim tapes,security bolts,tyre levers,and puncture repair kits,motor-cycle rims,and motor-cycle clothing.

My '39 16H doesn't have security bolts and I stopped using them on "modern" bikes when I went over to alloy rims in the early eighties, but my recollection on Commandos was that they were Whitworth (or were they UNC by then ?)

Always Withworth on the wartime ones, first a thick chrome leather washer, then a flat washer, then the nut.







Lex

email (option): welbike@outlook.com