Torque Wrench Calibration

Torque Wrench Calibration

Torque wrench calibration is important for effectiveness and safety of a person’s car and home repairs. This calibration ensures proper functioning of the wrench. For safe and effective use you should calibrate your torque wrench properly calibrated to suit one’s needs.

Steps on how to calibrate

1. You should mark the center point of the wrench’s head using a marker.

2. Get the measurement from the center point to the point where most pressure is applied when the wrench is in use. Record the distance either in inches or feet pound depending on the type of wrench you own. Record the distance as “D1″.

3. Use a vice to clamp your wrench in a horizontal position and then using a string suspend a 20 pound weight at the handle of the wrench.

4. Adjust the position of the weight until the wrench measures 40 foot pounds or in the case of inches 480 inches pound. Measure the distance from the string to the center point and record it as “D2″.

5. To find the calibration ratio divide “D2″ by “D1″.

6. In order to set the torque of your wrench to a specific application multiply the calibration ratio with the required torque of the bolt.

Torque wrench calibration equipment

Torque wrench calibration readjusts the torque wrench so that the performance delivered by it reflects the indicated torque on the gauge. Torque wrench calibration equipment are certified means and methods by which torque sensors and torque testers are calibrated. These equipment are N.I.S.T and ISO certified. Torque calibration is usually done in the laboratory or may take place onsite.

1. Loading bench

A loading bench an accurate laboratory torque wrench calibration equipment that ensures accurate torque wrench calibration, free of human influences or any transducers and end load factor.

2. Calibration Hex Step adapters

These allow for a wrench with multiple size to be used with a single adapter for torque wrench calibration.

3. Calibration stands

These stands keep torque wrenches which are rotary in a stable position to allow for their calibration.

4. Calibrated test equipment

Calibrated dead weights that are certified for use by ISO, N.I.S.T and other international bodies to be used to calibrate torque wrench.

Torque wrench tester

Torque results when a force is applied to a known radius. There are various types of torque wrench tester. These include;

1. Motorized torque wrench loaders

These loaders allow testing of wrenches according to the ISO 6789:2003, American military standards GGG-W-686 and BS EN 26789:2003 to calibrate the wrenches. They exploit Norbar’s torque measuring system by variations due to operator.

2. Torque wrench tester (ISO 1500, Part No. 60118)

This tester allows the wrenches to be calibrated using ISO 6789:2003, American military standards GGG-W-686 and British standards BS EN 26789:2003. They take advantage of Norbar’s torque measuring system through reducing the variations that are as a result of the operator.

3. Torque wrench tester (ISO 3000, Part No. 20505)

This tester allows the wrenches to be calibrated using ISO 6789:2003, American military standards GGG-W-686 and British standards BS EN 26789:2003. They take advantage of Norbar’s torque measuring system through reducing the variations that are as a result of the operator.

Torque wrench calibration service

Torque wrenches should be checked periodically to ensure safety and effectiveness is maintained. Worn out and defective parts should be replaced. For proper maintenance a torque wrench calibration service should be carried out after 100,000 cycles.

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