If the torque wrench is set to 46.7 in-lbs with 8-inch length and 2-inch reverse extension, what is the resulting torque at the fastener (TA)?

If the torque wrench is set to 46.7 in-lbs with 8-inch length and 2-inch reverse extension, what is the resulting torque at the fastener (TA)?

• A. 35 in-lbs
• B. 28 in-lbs
• C. 37.5 in-lbs
• D. 41 in-lbs

Answer: (A)

The torque at the fastener depends on the effective lever arm. When you use a reverse extension, the lever arm becomes shorter, so the actual torque is reduced proportionally to the ratio of the new length to the wrench length. Calculate the effective length: 8 inches minus 2 inches = 6 inches. Then TA = 46.7 in-lbs × (6/8) = 46.7 × 0.75 ≈ 35.0 in-lbs. So the resulting torque at the fastener is about 35 in-lbs.

The torque at the fastener depends on the effective lever arm. When you use a reverse extension, the lever arm becomes shorter, so the actual torque is reduced proportionally to the ratio of the new length to the wrench length.

Calculate the effective length: 8 inches minus 2 inches = 6 inches.

Then TA = 46.7 in-lbs × (6/8) = 46.7 × 0.75 ≈ 35.0 in-lbs.

So the resulting torque at the fastener is about 35 in-lbs.