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Ounce-inch (oz·in) is a small imperial torque unit used for precision instruments, watchmaking, and micro-mechanical assembly where even pound-inches would be too large. Small servo motors, camera lens mechanisms, and delicate electronics fasteners are rated in oz·in. One ounce-inch equals approximately 0.00706 newton-meters.

Pound-inch (lb·in) is an imperial torque unit for smaller precision applications, commonly used for electronics assembly, small engine specifications, and instrument calibration. Torque screwdrivers and precision fastener specifications in the US typically use lb·in. One pound-inch equals approximately 0.113 newton-meters or 1/12 of a pound-foot.