Torque test for bolts

Bolt torque testing is also known as fastener testing. Two of the more common applications for torque testing are in fastening and in products with rotating parts such as motors, engines or transmissions. Our test products are manufactured per the specifications of notable organizations such as General Motors, For Chrysler, and USCAR.

Insufficient torque can lead to the fastener being loosened by vibrations while excessive torque can cause stretching and breaking of bolts. There are types of torque wrenches that you can use from, one is having the digital or dial gauge and the other has clicked type torque wrench.

At the point the fastener breaks loose, the torque reading is recorded. The torque value to loosen the fastener is the approximate torque that was applied to the joint. Marking Test - Once the fastener tightene mark clearly the surface of the fastener, nut or bolt and continuing the mark onto the surface being clamped for reference. JM Test Systems is a distributor of CDI Torque Wrenches.

ASTM A3is an ASTM (American Society of the International Association for Testing and Materials) International standard for heavy hex structural bolts. It is specified for Heat Treated 8MPa Minimum Tensile Strength. Occasionally referred to as torsion testing , torque testing is used to determine performance characteristics of a sample component for either material qualification or failure analysis purposes.

The association between tension and torque should be considered carefully, since it is quite hard to specify the variation of conditions of a fastener. There are two different approaches to torque measurement : reaction and in-line. How do you check the torque on a bolt? Is it important to torque bolts to Spec?

What is the torque spec on the bolts on the rocker arm, it? What are the torque settings for head bolts? Bolt Science can perform a range of tests on fasteners and bolted joints to assist organisations in problem resolution, our test capabilities include: Torque -Tension Tests Determination of the torque -tension relationship for a threaded fastener allowing the appropriate tightening torque to be determined.

Proofload is the published number that full size headed bolts are tested to. The bolt is stressed up to the proofload value, and if there is no deformation, elongation, or fracture, then the bolt is deemed to have passed. For bolting specifications that do not have a published proofloa it is usually calculated at of minimum yield strength.

Applied Technical Services possesses a broad range of mechanical testing capabilities, one of which is called torque testing. Since we initiated this sample testing procedure, we have improved the consistency and level of quality of our products. The intuitive graphical illustration of the helps us better understand the whole test and the nature of the torque characteristics, which assist in the design process.

Torque set anchors: wedge, sleeve, and heavy-duty sleeve anchors. Deformation set anchors: drop-in, stu self-drilling, shell and drive-pin anchors.

General Installation Requirements All threads, nuts, and bolts must be clean, rust and oil free, and all torqueing must be done against at least one washer of the type and size specified. Between the piston and the body of the unit is hydraulic fluid which is compressed by the tension in the bolt. This hydraulic pressure is then read on a dial gage, scaled to read in terms of bolt tension in thousands of pounds (kips), rather than psi of hydraulic pressure. These stresses combine to induce twist.

If torque continues to be induce the stress along the angle of twist will be the largest stress while the bolt is being torqued. Consequently, the stress along the bolt axis (axial tension) will be something less.