Proof Load Calculation
The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. As long as a bolt is never tensioned beyond its specified proof load you can be assured that it has maintained its original size and shape and may be safely reused.
Proof load is defined as the maximum tensile force that can be applied to a bolt that will not result in plastic deformation.
Proof load calculation. Bolt preload tension force. Proof load is typically between 85 95 of the yield strength. In other words the bolt returns to its original. Bolt preload tension force equation calculator. In the tension joint the bolt and clamped components of the joint are pre load designed to transfer the external tension load through the joint by way of the clamped components through the design of a proper balance of joint and bolt stiffness. Mechanical motion systems. By definition the proof load is an applied tensile load that the fastener must support without permanent deformation. Metric bolt grades and strength calculator to show proof strength tensile strength vickers brinell hardness minimum breaking torque and stress area of metric bolts and screws made of carbon steel and alloy steel with designations 46 48 58 88 98 109 and 129. Force calculations for bolted joints. Proof load is defined as the maximum tensile force that can be applied to a bolt that will not result in plastic deformation. Bolted joints are often tightened to 75 to 80 of bolt proof load. Proof loads for screws iso metric fine threads iso 898i 1988. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. To avoid this risk most carbon or alloy steel bolts have a defined proof load which represents the usable strength range for that particular fastener. Designing for the use of bolts according to proof load can help prevent plastic deformation.
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