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

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Discussion Overview

The discussion revolves around the confusion between the torque units inch-lb and inch-lbf, exploring their definitions and usage in practical contexts.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant, Ram18, equates inch-lb and inch-lbf and expresses a need for a torque of 2500000 inch-lbf.
  • Another participant argues that lb is a unit of mass and suggests that inch-lb is not a torque unit, proposing that inch-lbf should be used instead, while maintaining the numerical value.
  • A third participant acknowledges the previous comment with thanks.
  • A later reply notes that in practical usage, torque wrenches are commonly referred to using terms like 'inch pound' or 'foot pound', despite the technical distinction involving pound-force.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the terminology, with differing views on the correct usage of inch-lb versus inch-lbf and the implications of these units.

Contextual Notes

There is a lack of clarity regarding the definitions of the units and their appropriate contexts, as well as the implications of using mass versus force in torque calculations.

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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