The specific torque loading for a bolt is 50 lbs.ins but an extension of 2 inches is needed to reach the bolt in addition to the 8 inches torque wrench. What will the actual reading?
- 54 lb.ins.
- 40 lb.ins.
- 60 lb.ins.
Explanation from PART66Online
Adding an extension lengthens the effective lever, so the wrench scale under-reads the true bolt torque. The applied torque equals the scale reading times (wrench + extension) divided by wrench length, so the reading equals 50 x 8 / (8 + 2) = 40 lb.ins to achieve 50 lb.ins at the bolt.
D
disho251 asked · 6 Mar 2024
can someone please explain this?
Community Comments (2)
B
Bruce
7 Jun 2024
When using an extension with a torque wrench, the applied torque to the bolt changes. In this case, the 2-inch extension increases the total length of the torque wrench to 10 inches (8 inches of the wrench + 2 inches of the extension). The formula to calculate the new reading is:
Actual reading = (Specific torque load × Length of the wrench) / Total length (wrench + extension)
So, for this question:
Actual reading = (50 lb.ins × 8 inches) / 10 inches = 40 lb.ins
Actual reading = (Specific torque load × Length of the wrench) / Total length (wrench + extension)
So, for this question:
Actual reading = (50 lb.ins × 8 inches) / 10 inches = 40 lb.ins
D
disho251
9 Jul 2024
thank you
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