SOHC.co.uk Forums > CB750

fork clamp bolt sizes

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Trigger:
There is tensile load on fork clamps. Think of the load if you hit a pothole at 50mph. The weakest points of a bolt is in the stressed area in the thread root. It is all down to the type of thread ie, coarse threads are used for clamping and fine threads are weak.Stress area of a bolt are calculated to the number of threads per inch. 

neilb:
The bolt itself does not stop the fork stanchion sliding through the yokes, its down to friction between the stanchion & yoke. If you could grip it enough with a jubliee clip (bit extreme !) it wouldnt move. Not sure where your going with the thread sizes, I work on marine engines with power in excess of 30000 bhp, and our cylinder head studs are very fine thread, certainly not metric or bsw !

Trigger:
Your be using HT grade 8 then.

neilb:
if you like

Trigger:
What size are the bolts on this 3000bhp engine. Love to know so i can work out the tensile strength.

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