Is it bad to tighten bolts too tight?
If you over-tighten to the point where the gasket is too compressed or the clamp is bending, then you could be risking a break or malfunction in the future. With the right torque wrench, you can tighten the fastener to the appropriate level, given that your wrench has been calibrated to the appropriate settings.
When do you use torque to tighten a bolt?
The bolt is tightened until the desired P (load) is indicated by the tension indicating device. The tightening torque required to achieve the desired tension is the actual tightening torque that should be used for that given application.
What is the formula for target tightening torque?
The basic formula T = K x D x P stated earlier takes these factors into account and provides users with a starting point for establishing an initial target tightening torque. Target tighten torque (the result of this formula is in inch pounds, dividing by 12 yields foot pounds
How does lubrication affect the tightening of a screw?
EFFECT OF LUBRICATION If a screw is lubricated, the friction in the threads and under the head is decreased and the relation between tightening torque and clamping force is changed. If the same torque is applied as before lubrication, a lot more torque will be trans- formed into clamping force.
Do you need torque for non-preloded bolts?
This connection is design as non- preloded bolts connection. So the only torque which I require is for tightening the bolts as much as they won’t get loose during working life. So I would like to know if there are common sense recommendations treating about it.
What does torque mean when tightening bolts?
When you tighten a bolt in a bolted joint, you use a twisting force, called torque. Torque is related to bolt tightness , but many additional factors – such as friction – combined into a single “nut factor” can have a significant impact on the relationship of torque to the tightness of the bolted joint.
How do you tighten a bolt?
Grasp the top of the bolt stem with the pliers again. Take hold of the nut with the wrench and apply slow, steady pressure to the nut. It should begin to slowly tighten. Tighten it very slowly, one-quarter turn at a time. Stop frequently to check the toilet and see if it is still loose.
What are the torque requirements for bolts?
The required bolt clamping force for a joint is 20000 lbs. The torque required for a 3/4″ dry steel bolt to achieve this tension can be calculated as. T dry = (0.2) (20000 lb) (0.75 in) = 3000 (in lb)
How do you calculate bolt tension?
Determine the tension force on the bolt. This can also be measured using a force transducer (again, if the value is not already known). Assume the tension force is 3 lbs. Subtract the preload force from the tension force. In our example, the tension force (2 lbs.) subtracted from the preload force (3 lbs.) gives 1 lbs.