Is torque the force that holds assembled components together?
Torque is the measurement of twisting force needed to thread the fasteners together.
What is K in torque formula?
where T = torque, K = nut factor, sometimes called the friction factor, D = bolt diameter, and F = bolt tension generated during tightening. This expression is often called the short-form equation.
What should the torque of a bolt be?
Note that standard dry torques are normally calculated to produce a tensile stress – or axial force or clamp load – in the bolt that equals to 70% of minimum tensile strength or 75% of proof strength. The required bolt clamping force for a joint is 20000 lbs.
When to use hydraulic Torquing on a flange bolt?
The clamp load produced during tightening is higher than 75% of the fastener’s proof load. To achieve the benefits of the pre-loading, the clamping force in the screw must be higher than the joint separation load. When the bolt loading requires a torque higher than 678 Nm (500 ft-lbs.) to be applied, hydraulic bolt torquing is recommended.
What happens when torque is applied to a nut?
As torque is applied to the bolt and the bolt rotates relative to the nut or to a threaded hole, the wedging action between the mating threads causes the bolt to stretch, compressing the clamped members.
How to calculate the torque of a M30 metric bolt?
The proof load for a M30 metric bolt grad 8.8 is 373000 N. The torque required to achieve this tension with a dry bolt can be calculated as Lubricating the bolt with SAE 30 oil reduces the torque required to achieve the same tension with approximately 40%. The reduced torque can be calculated
Note that standard dry torques are normally calculated to produce a tensile stress – or axial force or clamp load – in the bolt that equals to 70% of minimum tensile strength or 75% of proof strength. The required bolt clamping force for a joint is 20000 lbs.
The clamp load produced during tightening is higher than 75% of the fastener’s proof load. To achieve the benefits of the pre-loading, the clamping force in the screw must be higher than the joint separation load. When the bolt loading requires a torque higher than 678 Nm (500 ft-lbs.) to be applied, hydraulic bolt torquing is recommended.
How much torque does a BER Bolt have?
ber bolt tightness is actually measured in TENSION (stretch), not TORQUE (twist). This 7/8” A325 bolt has experienced only 25,000 pounds of tension before it broke in torsion (twist) while someone applied 800 ft- lbs. of torque.
What is the torque tension in Fastenal 12.9?
12.9 Class 12.9 Clamp Load (lbs) Tightening Torque Clamp Load (lbs) Tightening Torque Clamp Load (lbs) Tightening Torque Clamp Load (lbs) Tightening Torque K = 0.15 K = 0.17 K = 0.20 K = 0.15 K = 0.17 K = 0.20 K = 0.15 K = 0.17 K = 0.20 K = 0.15 K = 0.17 K = 0.20