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CDI-Torque: Use of Adapters
Formula for Calculating Addition of an Adapter to a Torque Wrench:
| Length (L) = |
Effective length of the wrench as described below.
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| Dial Wrenches = |
The measured distance from the center of the square drive to the center ring or notch on the handle.
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| Micrometer Wrenches = |
The measured length from the center of the square drive to the center of the handle, with the wrench set at the desired torque reading.
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| Desired Torque (TA) = |
The torque value designated for the fastener with or without an adapter.
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| Added Length of Adapter (A) = |
The measured length from the center of the adapter drive to the center of the wrench square drive.
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| New Setting (TW) = |
The torque setting on the wrench allowing for the added length of the adapter. This reading will be lower than the desired torque.
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| Example: |
250 ft. lb. Dial Wrench using a 2” long crowfoot adapter
L = Effective Length: 18.75”
Desired Torque = 250 ft. lb.
Length of Adapter = 2” |
| Result: |
18.75" x 250 ft. lb.
18.75" + 2" |
= Pull Wrench to 226 ft. lb. |
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JM Test Systems calibrates and services all CDI Torque Wrenches. For more information regarding rental or purchase of a CDI Torque product, please call 1-800-353-3411 or email us at jmsales@jmtest.com.
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