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rictus01 · 30-06-13, 04:38 PM

Bolts for Jap bike (and many others) are generally discribed as M (for metric) and a number corresponding to the mm size in diameter of the threaded shaft, so an M4 would be 4mm, then you have the type, for allen bolts it's normally cap or button (square type or domed), the other dimension you'll need is length, for example you'd order am M4 x 50 (the 50 would be 50mm length).

beyond this and normally on bigger bolts; they have different thread pitches (smaller than M8 are standardized), for this you'll need a thread gauge to measure it, but an example would be M10 x 50/1.25; the 1.25 being the thread pitch.

HTH

Cheers Mark.

30-06-13, 04:38 PM	#4
rictus01 Member Mega Poster Join Date: Jul 2003 Location: South London Posts: 9,799	Re: Allen bolt sizes Bolts for Jap bike (and many others) are generally discribed as M (for metric) and a number corresponding to the mm size in diameter of the threaded shaft, so an M4 would be 4mm, then you have the type, for allen bolts it's normally cap or button (square type or domed), the other dimension you'll need is length, for example you'd order am M4 x 50 (the 50 would be 50mm length). beyond this and normally on bigger bolts; they have different thread pitches (smaller than M8 are standardized), for this you'll need a thread gauge to measure it, but an example would be M10 x 50/1.25; the 1.25 being the thread pitch. HTH Cheers Mark. __________________ Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming, 'Wow! What a Ride!