Torque Wrench ( Aviation Tools)

Torque Wrench

There are times when definite pressure must be applied to a nut or bolt as it is installed. In such cases, a torque wrench must be used. A torque wrench is a precision tool consisting of a torque indicating handle and appropriate adapter or attachments. It measures the amount of turning or twisting force applied to a nut, bolt, or screw.

Torque Wrench Extention Calculation

When you put an extension on a torque wrench (e.g. a crowfoot or a dog bone) the torque applied to the fastener increases as the lever arm extends. The calculator will work out what value you should set into the wrench to achieve the required fastener torque.

The following formula has been used:

• M1 = M2 x L1 / L2

Where:

• M1 is the torque setting of the wrench
• M2 is the actual torque applied to the nut
• L1 is the normal length of the wrench
• L2 is the extended length of the wrench

Before each use, the torque wrench should be visually inspected for damage and calibration. If a bent pointer, cracked or broken glass (dial type), or signs of rough handling are found, the wrench must be tested. Torque wrenches must be tested at periodic intervals to ensure accuracy.

Commonly used torque wrenches include the deflecting beam, dial indicating, micrometer, and electronic setting types.

Dial Indicating Torque Wrench

Electronic Torque Wrench

Micrometer Click Type Torque Wrench

When using the deflecting beam and the dial indicating torque wrenches, the torque is read visually on a dial or scale mounted on the handle of the wrench. The micrometer setting torque wrench is preset to the desired torque. When this torque is reached, the operator notices a sharp impulse or breakaway “click.” 

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