What is difference between in-lb and inch-lbf?

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SUMMARY

The discussion clarifies the distinction between the torque units inch-lb and inch-lbf. Participants confirm that inch-lb is not a valid torque unit, as it incorrectly uses a unit of mass instead of force. The correct term is inch-lbf, where 1 lbf represents the force exerted by a 1 lb mass under standard gravity. For practical applications, users are advised to replace lb with lbf when calculating torque, ensuring accurate measurements.

PREREQUISITES
  • Understanding of torque and its units
  • Basic knowledge of force and mass concepts
  • Familiarity with the gravitational constant (32.2 ft/s²)
  • Experience with torque measurement tools, such as torque wrenches
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  • Research the conversion between different torque units, including foot-pounds and Newton-meters
  • Learn about the applications of torque in mechanical engineering
  • Explore the principles of force and mass in physics
  • Study the specifications and usage of torque wrenches
USEFUL FOR

This discussion is beneficial for mechanical engineers, technicians using torque wrenches, and anyone involved in precision assembly or maintenance tasks requiring accurate torque measurements.

ram18
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Hi friends,

I have so much confusion between torque unit Inch -lb and inch -lbf .

I think inch-lb = inch-lbf

i know that 1 lbf = 32.2 lb.ft / sec^2

I need 2500000 inch-lbf torque required so i consider lb-inch .

Thanks,

Ram18
 
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lb is a unit of mass, so inch-lb isn't a torque. They probably mean inch-lbf, where 1 lbf is the weight of a 1 lb mass.

So yea, just replace lb with lbf without changing the numbers.
 
Thanks unrest
 
Just so you know, outside of school, no one ever refers to the output of a torque wrench as anything other than (spoken) 'inch pound', 'inch ounce' or 'foot pound'. Yes, it's actually a pound-force or ounce-force, but it's just not used.

Same sort of thing when people call bolts, screws.
 

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