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Metric Vs U S Bolt Torque Specs

When discussing engine maintenance, torque ers to the amount of force required to rotate a bolt around a fixed point or axis. In the United States, the Society of Automotive Engineers (SAE) issues standards for bolt and torque specifications; in most other countries, especially European ones, they use metric equivalents.

Metric Dimensions

In metric units, bolts are listed according to three parameters. The first reading is the major thread diameter, listed in millimeters. The second value represents the distance between the threads, in millimeters. The third value represents the bolts length in millimeters. A metric label for a bolt might look like this: M8-1.25x25.

U.S. Dimensions

U.S., or SAE, bolt dimensions are listed according to three parameters. The first value represents the major thread diameter in inches. The second value is the number of threads in the bolt per inch. The third value indicates the bolts length in inches. An SAE label for a bolt might look like this: 5/16-18 1-1/2.

Pound-Feet vs. Netwon Meters

In U.S. units, torque is generally listed in pound-feet (lb.-ft.) or less commonly in pound-inches (lb-in.). In metric units, the same values are listed in Newton-meters (nm). To convert lb-ft. to nm, multiply the value by 1.356. To convert nm to lb-ft., multiply the value by 0.738. To convert lb-in. to nm, multiply the value by 0.113. To convert nm to lb-in., multiply the value by 8.851.

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Labels: bolt, metric, s, specs, torque, u, vs