﻿GET_7FDL_L2_01_01_01_22 - ANIMATION Screen
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With a torque wrench, you may need to use adapters to reach inaccessible bolts or nuts. 

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When adapters are used, the reading of the torque wrench dial is different from the actual torque exerted. 

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The additional torque exerted on the nut or bolt over that shown on the dial depends on: The length of the adapter and the angle at which the adapter is positioned on the wrench. 

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When you apply an adapter to a torque wrench, you increase the mechanical advantage. 

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Therefore, you must make an adjustment to the torque wrench setting to apply the correct torque value to the fastener. 

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<b>Note:</b> When using a torque wrench adapter, a 90-degree torquing angle is recommended. 

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If unable to torque at a 90-degree angle, apply the adapter to the torque wrench at the angle needed to tighten the fastener; however, the torque wrench setting must be adjusted to the proper value as discussed in GEI-81913, TORQUE WRENCH APPLICATION AND VALUES, which provides details to manually calculate the correct torque wrench setting.

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The torque wrench setting must be formulated by using the torque wrench length and the adapter length measurements.

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The length of the adapter (A) is added to the length of the wrench from the wrench head to the midpoint of your grip on the handle (B), to get the overall length (C).

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The actual torque wrench setting is calculated by dividing dimension B by dimension C, then multiplying the answer by the torque specification.

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When the torque adapter is offset, the measurement must still be taken in a straight line with the torque wrench.

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Let’s try an example.  

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In this example, the wrench length (B) is 3’ and dimension A is 6”.

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Therefore, overall length (C) would be 3.5’ (3’ + 6”). 

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Using the formula from before, will give you the necessary torque setting.

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With the added mechanical advantage provided by this adapter, a torque wrench setting of 86 lb.-ft. will apply 100 lb.-ft. of torque to the fastener.

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It is important that the pull on the torque wrench handle be concentrated at the pull point position, marked as "P" in the figure. 

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A shift in this position causes a considerable discrepancy between the torque reading and the effective torque.

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The threads of both parts must also be clean, free of burrs, and properly lubricated, using the same lubricant as was applied to the contact face of the nut or bolt.