# The proper way to express torque units is lbf·ft or N·m

## The proper way to express torque units is lbf·ft or N·m

Morehouse will always make an effort to educate the masses on the proper way to express torque units. Looking at several scopes, manufacturer's specification sheets, and other sources, as a metrology community, we do not always express units of torque properly.

Torque =  Force * Length

This means N·m is acceptable, lbf·in is acceptable, and lbf·ft is acceptable.

ft·lbf or in·lbf is not the conventional method for expressing torque. You will not find this as an accepted expression of torque in the ASTM torque standard (ASTM E2428) or any NIST handbook. You will find several manufacturers expressing torque the improper way.

The foot-pound force (symbol:  ft·lbf) is a unit of work or energy in the Engineering and Gravitational Systems in the United States' customary and imperial units of measure. It is the energy transferred by applying a force of one pound-force (lbf) through a linear displacement of one foot.

A  pound-foot  (lbf·ft) is a unit of torque or moment of force (a pseudovector). One pound-foot is the torque created by one pound force acting at a perpendicular distance of one foot from a pivot point.

Torque is derived from the SI units of Length, Mass, and Time. The metre is the SI base unit of length. The kilogram is the SI base unit of mass. The second is the SI base unit of time.  T.

The improper use of torque units can easily be corrected. When you see manufacturers using ft·lbf on a torque specification, let them know the proper way to express torque is  Force times  Length.
So remember to express torque in lbf·ft, lbf·in, lbf·oz, or N·m.
Torque Conversions Per NIST sp811
It is important to note that NIST does not currently offer torque calibration services.  A list of NMIs (National Metrology Institutes) offering torque can be found on the BIPM website here.

Morehouse currently has the second most accurate torque machine in the world. This is the most accurate machine in North America. We can achieve measurements better than 0.0025 % of applied torque from 0.5 through 1475 lbf · ft. Since NIST does not offer torque, Morehouse can provide torque measurements traceable to SI, through NPL for anyone in North America needing traceable torque measurements.

Companies worldwide rely on Morehouse for accuracy and speed. The company turns around equipment in 7-10 business days so customers can return to work quickly and save money.

The York, PA-based company provides force and torque measurement products and services worldwide.

Morehouse Instrument Company, a trusted and accredited provider of force and torque measurement services for over 100 years, offers measurement uncertainties 10-50 times lower than the competition.

Morehouse helps commercial labs, government labs, and other organizations lower their measurement risk by lowering equipment uncertainties for torque and force measurement. Contact Morehouse at info@mhforce.com or www.mhforce.com

We believe in changing how people think about force and torque calibration in everything we do.

This includes setting expectations on load cell reliability and challenging the "just calibrate it" mentality by educating our customers on what matters and what causes significant errors.

We focus on reducing these errors and making our products simple and user-friendly.

This means your instruments will pass calibration more often and produce more precise measurements, giving you the confidence to focus on your business.

Companies around the globe rely on Morehouse for accuracy and speed.

Our measurement uncertainties are 10-50 times lower than the competition.

When you choose Morehouse, you're not just paying for a calibration service or a load cell.

You're investing in peace of mind, knowing your equipment is calibrated accurately and on time.

Email us if you ever want to chat or have questions about a blog.

Our YouTube channel has videos on various force and torque calibration topics here.

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