ounce-force foot [ozf*ft] Unit Converter

Definition of ounce-force foot [ozf*ft] unit

An ounce-force foot (ozf·ft) is a unit of torque equal to the twisting moment produced by one ounce-force acting at a perpendicular distance of one foot from an axis. It equals 12 ounce-force inches and approximately 0.08474 newton-metres.

History of ounce-force foot [ozf*ft] unit

The ounce-force foot emerged from the inch-pound and foot-pound systems of mechanics, which developed through English customary measurement. It applies the smaller ounce-force to the larger foot distance, creating a convenient torque unit for light mechanisms and instruments. Although never as internationally standardized as the newton-metre, it appeared in engineering tables, workshop manuals, and manufacturers’ specifications, especially in countries using U.S. customary units. Its symbol has varied—ozf·ft, oz·ft, or oz-in equivalents—so modern technical documents generally state the force basis explicitly and often provide an SI conversion.

Applications of ounce-force foot [ozf*ft] unit

Today, ounce-force feet are used mainly for specifying low torque in precision and hobby equipment, such as small gearboxes, camera mechanisms, model engines, instrument controls, and miniature fasteners. A torque wrench or driver may be calibrated in ozf·ft when modest tightening forces are required. Engineering practice increasingly converts the value to newton-metres or ounce-force inches.

Complete list of ounce-force foot [ozf*ft] unit conversion