Larry is correct in that a tightened fastener stretches. We use torque because it is easier to measure. Based on the physical characteristics of the metal, the amount of torque applied vs. thread configuration can be used to calculate the approximate stretch of the fastener which, based on the tensile strength and elongation characteristics of the material, can be used to determine the 'clamp force' being applied to the joint. That's an oversimplification, but as others have said, is probably close enough for KR work.
This is why for some applications new fasteners are recommended due to the fatigue factor involved in repeated stretching in high force applications. As usual, your mileage may vary. Mark W N952MW ----------------------------------------------------------------------- Larry Flesner said.... -----Original Message----- <Cc: Flesner Subject: KR> bolt torque? When a bolt is tightened (torqued) the bolt will stretch. Measuring the "stretch" will indicate the amount of torque. Probably more accurate than measuring with the wrench as other factors can cause a false reading. Larry Flesner --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
