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Approximate measures. Taken from a Norton WD16H.Thread is 1/4" 20 tpi. That will be 1/4BSW.Thread length 17 mm. Length 24mm or 15/16.Total length 28.2 mm including head.Hex head with screwdriver slot, 7.9 mm. 1/8W, 5/16AF or 8 mm, all spanners fits.Main difference between 1/4W and 1/4UNC is thread angle. 55 vs. 60 degrees.A 1/4UNCx1" might work, if you don't find any Whitworth screws. Might be that an hex head is too large, an Allen screw might be better.A washer or two might be needed. I prefer not to shorten screws used in aluminium. Not easy to grind them for a smooth entrance.
Approximate measures. Taken from a Norton WD16H.
Thread is 1/4" 20 tpi. That will be 1/4BSW.
Thread length 17 mm. Length 24mm or 15/16.
Total length 28.2 mm including head.
Hex head with screwdriver slot, 7.9 mm. 1/8W, 5/16AF or 8 mm, all spanners fits.
Main difference between 1/4W and 1/4UNC is thread angle. 55 vs. 60 degrees.
A 1/4UNCx1" might work, if you don't find any Whitworth screws. Might be that an hex head is too large, an Allen screw might be better.
A washer or two might be needed. I prefer not to shorten screws used in aluminium. Not easy to grind them for a smooth entrance.
