A dial torque wrench is typically used as a quality control instrument to verify or monitor torque. What is a dial wrench? A type of wrench that measures the amount of torque applied to a fastener and displays the torque value on a dial. The dial wrench captures the finishing torque applied to a fastener with a memory pointer.
The versatile dial wrench can be used as an assembly tool for fastening applications or as a quality control tool for joint testing, torque auditing or torque verification. These old reliable tools are suitable for use by operators of any skill level. For fastening applications, an operator can clearly monitor the torque applied. Some dial wrench models feature an audio and visual signal system, which provide a clear indication to the operator when the target torque has been reached. For torque auditing applications, a dial wrench is alternative solution to a digital wrench for conducting a quick visual torque verification test.
Torque Auditing After the Assembly Process
Torque measurement is paramount for many manufacturers. Simply running a fastener or bolt down until it’s snug and tight and assuming the torque control process is complete, is no longer sufficient. Measuring torque doesn’t stop once the assembly process is complete. As part of the overall quality control process, manufactures should include a “Torque Auditing” program. A method to detect loose fasteners or any signs of joint relaxation. Torque auditing validates the fastening process, the torque tool, the product design and the materials used for the application.
A single fastener, inaccurately or incorrectly tightened, can lead to the failure of a product, which impacts the bottom line. A dial torque wrench can also be used to audit the residual torque on a previously tightened threaded fastener. The dependable wrench can used to perform three common torque auditing methods.
1) First Movement Test – Once the fastener has been tightened, employ the use of torque measuring tool. Mark the tightened fastener and surrounding application. In the tightening direction, begin to slowly apply force to the tool until the first movement in the fastener is noted. The reading recorded is a good indication of the original torque applied to the joint. This is the best way to determine residual torque.
2) Loosening Test – This is a similar process to the first movement test described above, except instead of the tightening the fastener, the torque is applied in the direction that loosens the fastener. 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.
3) Marking Test – Once the fastener tightened, mark clearly the surface of the fastener, nut or bolt and continuing the mark onto the surface being clamped for reference. This time loosen the fastener and retighten until the marks on both application and fastener are aligned. The torque required to return the fastener to its original location is the reference to the original torque applied to the fastener.
The Mountz dial wrench is designed and manufactured to meet or exceed the accuracy and repeatability requirements of ISO6789: 2003. Mountz offers various dial wrench models covering a torque range from 7 inch-pounds up to 1,500 foot-pounds. The wrench features a recessed dial, which minimizes damage to the dial display. Featuring a lightweight aluminum handle the durable dial wrench is non-length dependent.
Using a quality dial wrench makes a safer world through accuracy and precision. Controlling torque is essential for companies to ensure their product’s quality, safety and reliability isn’t compromised. The failure of a three-cent fastener that isn’t properly tightened can lead to catastrophic or latent failures. Fasteners that are insufficiently fastened can vibrate loose and excessive torque can strip threaded fasteners.
Request an appointment for dial wrench demonstration by a Mountz representative.