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Thanks Kath, I am in the uk, Midlandish area......... :-) Regards Martin

Thanks all, I have looked at the HYDROBOLT website, I will contact them once the design parameters have been set. Regards Martin

Hi, Can anyone tell me where to get UNF medium steel high quality traceable bolts from Please ?? from 1/4" to 3/4" range Thanks Regards Martin

East Midlands area...... Kettering.

I am not currently rolling the threads, why would I need to roll the threads when using STST, is this normally the case ?? However I do bead blast to help with fatigue etc... I have seen similar products to mine that are not bead blast and the threads have been undercut normal UNF form I use...

No I wouldn't be Zinc Passivating the STST, I currently use EN32B which we do Zinc Pass in Gold........ But it's interesting to hear about the nitric acid passivations etc.. Always willing to learn more.

What's KSI ? I am unfamilier with this term. Also I have looked at Duplex and super duplex, they appear to have excellent qualities, however, what are the fracture and fatigue qualities, I couldn't find any results for the duplex range of STST's.....

Hi, Thanks for the reply, it is machined from 5/8"bar, with a 1/2" dia stepdown, then stepping down to 7/16unJf using EN32B (approx 460N/mm^2) steel I calculate that the core is 0.3762" 9.556mm :- CSA = (pi*D^2)/4 = 71.71mm^2 :- culminating in about 3360Kg Of tensile load... I understand that...

Hi, Firstly appologies if this is in the wrong area.... :-( Ok now my questions, I have been making steel suspension parts for racing for some years, however I have just been asked to make a set out of stainless steel for a road car ? I have always "shied" away from STST because of stress...