Which is the best way to control torque?
Which is the best way to control torque?
Control bolt hardness, finish, and geometry. Use “soft” bolts and tighten well past yield point. Use consistent snugging torque. Control bolt hardness and dimensons. Use bolts with flat, parallel ends. Leave transducer engaged during tightening operation. Mount transducer on bolt centerline.
When to use higher torque on a bolt?
Higher torques (up to theoretical yield) are sometimes used for bolts that cannot be locked to resist vibration. The higher load will increase the vibration resistance of the bolt, but the bolt will yield and unload if its yield point is inadvertently exceeded.
When to add running torque to normal torque?
Interaction formulas to be used for combining simultaneous shear and tension loads on a bolt (Should friction loads due to bolt clamping action be included in the interaction calculations?) Whether “running torque” for a locking device should be added to the normal torque
Where can I find the torque for fasteners?
This page provides the sections on proper bolt torque from Barrett, “Fastener Design Manual,” NASA Reference Publication 1228, 1990. Other related chapters from the NASA “Fastener Design Manual” can be seen to the right. Determining the proper torque for a fastener is the biggest problem in fastener installation.
Control bolt hardness, finish, and geometry. Use “soft” bolts and tighten well past yield point. Use consistent snugging torque. Control bolt hardness and dimensons. Use bolts with flat, parallel ends. Leave transducer engaged during tightening operation. Mount transducer on bolt centerline.
Interaction formulas to be used for combining simultaneous shear and tension loads on a bolt (Should friction loads due to bolt clamping action be included in the interaction calculations?) Whether “running torque” for a locking device should be added to the normal torque
Higher torques (up to theoretical yield) are sometimes used for bolts that cannot be locked to resist vibration. The higher load will increase the vibration resistance of the bolt, but the bolt will yield and unload if its yield point is inadvertently exceeded.
This page provides the sections on proper bolt torque from Barrett, “Fastener Design Manual,” NASA Reference Publication 1228, 1990. Other related chapters from the NASA “Fastener Design Manual” can be seen to the right. Determining the proper torque for a fastener is the biggest problem in fastener installation.
