For a target torque TA of 50 in-lbs with the same 8-inch wrench and 2-inch reverse-extension adapter, what should the torque wrench setting be?

For a target torque TA of 50 in-lbs with the same 8-inch wrench and 2-inch reverse-extension adapter, what should the torque wrench setting be?

• A. 50 in-lbs
• B. 60 in-lbs
• C. 66.7 in-lbs
• D. 62.5 in-lbs

Answer: (C)

Using a reverse-extension adapter changes the lever arm of the torque wrench. The torque you set on the handle translates to torque at the fastener based on the ratio of the lever arms. With an 8-inch wrench and a 2-inch reverse extension, the effective lever arm shortens to 6 inches (8 - 2). To reach a target of 50 in-lbs at the fastener, you must compensate for the shorter lever by increasing the setting: setting = target × (wrench length / effective length) = 50 × (8 / 6) ≈ 66.7 in-lbs. So, the correct wrench setting is about 66.7 in-lbs.

Using a reverse-extension adapter changes the lever arm of the torque wrench. The torque you set on the handle translates to torque at the fastener based on the ratio of the lever arms. With an 8-inch wrench and a 2-inch reverse extension, the effective lever arm shortens to 6 inches (8 - 2).

To reach a target of 50 in-lbs at the fastener, you must compensate for the shorter lever by increasing the setting:

setting = target × (wrench length / effective length) = 50 × (8 / 6) ≈ 66.7 in-lbs.

So, the correct wrench setting is about 66.7 in-lbs.