Is there a simple way to calculate torque if the clamping force of a fastener is known(or vis versa).Magnetic pumps Torque(in-lbs)=.2xbolt diameter(inches)xclampload (pounds). The .2 factor is a starting point. In actual practice, this factor can vary substantially depending on type of surface treatment on the bolt and presence/absence of lubricant.Handbooks typically state: T = (K*D*W)/12 T=torque D= dia. W = Clamp load K=0.09 to 0.3 depending on factors affecting friction.Suber-water pumps 0.3 for non-plated fastener, 0.12 if anti-seize compound is used.Screw pumps Typcially W = 75% of proof load of fastener Your formula is basically the same as given by swall with the added confusion of changing inches to feet. swall's formula is correct even without stating the units, but he did. Your formula is incorrect without stating the units and you did not. The obvious is now stated. Note that Swall is correct but did not offer guidance on the clamp load, no offense to Swall). If the wrong value is used the joint can loosen or bolt will fail. Self-priming pumps Selection of clamp load is often the biggest issue, not units.

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