What is the difference between bolt torquing and tensioning

They should only be used for loosening bolts, not tightening. The torque wrench will apply the repeatable torque required for the bolt to achieve the required load specification.

Bolt testing on the Calibore should be done daily and adjusting of the torque wrench should follow this testing. For more information, please consult our torque and tension specification chart , which details the minimum and maximum bolt tension.

Please note that this chart is only a guideline for structural bolt tightening. However, this gives up the benefits previously described. In addition, in order to solve the inherent inaccuracies in the tightening of critical flange torques, the bolt stress must be verified after tightening. Therefore, for IMO studs larger than 1. For bolts of 1. When deciding which tool to use to achieve the required fixture load, it is important to consider engineering specifications.

If tension is specified, it must be tension. If torque is specified, tensioning can be used if it can be approached. Many torque specifications allow greater accuracy, and there is no need to use tension. Both methods can achieve tightening bolt loads, but the two methods are very different, and various factors need to be considered before making the most appropriate choice. The bolt is designed to stretch only a small part. Due to the elasticity of the bolt material, the bolt wants to return to its original shape.

This inherent bolt spring tension causes the clamping force and the friction of the bolt thread to prevent loosening. Both torque wrenches and bolt tensioners stretch bolts to generate spring tension. However, they use different methods to accomplish this. Torque is a very indirect indicator of tension, because many factors affect this relationship, such as surface texture, rust, oil, chips, thread series and material type, etc.

If your application has a lot of bolts to be tightened, torque and high-quality torque wrenches are a good choice. Both tools have their own advantages and disadvantages, and it is important to use the method recommended by the manufacturer.

Save my name, email, and website in this browser for the next time I comment. Post author: TorcStark Post comments: 0 Comments Post published: September 29, Post last modified: September 29, Reading time: 7 mins read Before comparing torque and tension, you must first understand the principle of tightening bolts. This torque is usually measured in foot-pounds ft-lbs. However, the skill levels and training of those who use the torque tools equipment are determinants of how successful and accurate torque tightening will be.

Additionally, to achieve correct torque-tension relationship, the K-factor is critical. And note, K-factor is NOT the same thing as coefficient of friction. A proper K-factor is critical for understanding what applied torque value you will need. You also need to take into account friction on bearing surfaces, the bolt diameter, and other variables, which are best examined through experimentation. As mentioned above, bolt or stud tensioning produces axial load by pulling up on a fastener with what looks like a hydraulic load cell.

By using a standard hydraulic torque wrench to torque those bolts, it can take a lot of time. Washington noted that tensioning systems can cost up to 30 times as much as torque wrenches, making them a big investment.

Tension is the quickest, most dependable way to attain an even bolt preload when several bolts have to be tightened on a flange.

Tension can cut down on or even eliminate elastic interactions and over-compression of gaskets, and can also get rid of many of the obstacles torque faces when reaching desired preload.