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torque-angle tightening (also known as torque-angle tension control) is a method of securing the bolted joint when the initial tension is critical for reliability and safety. The technique relies on simultaneous monitoring of both the torque applied during the tightening as well as the angle of rotation, usually using a torque/angle wrench.
Torque; system unit code symbol or abbrev. notes conversion factor/N⋅m combinations Industrial: SI: Newton-metre: Nm N⋅m 1 Nm lbft; Nm lbfft; Non-SI metric: kilogram-metre: kgm kg·m 9.80665 Imperial & US customary: pound-foot: lbft lb⋅ft Pound-inch (lb.in) is also available 1.3558 Scientific: SI: newton metre: Nm N⋅m 1 Nm lbft; Nm ...
The number 28 stands for the maximum torque capacity in Nm/10. 28 means that, the transmission is capable of transferring 280 N⋅m (210 lb⋅ft) nominal torque to the input shaft. Compare: Actual transmission in Opel Signum: F40 means: FWD transmission with torque capacity of 400 N⋅m (300 lb⋅ft).
Torque (system unit unit-code symbol or abbrev. notes sample default conversion combination output units Industrial: SI: newton-metre: Nm N⋅m Triple combinations are also possible.
In the US, torque is most commonly referred to as the foot-pound (denoted as either lb-ft or ft-lb) and the inch-pound (denoted as in-lb). [ 17 ] [ 18 ] Practitioners depend on context and the hyphen in the abbreviation to know that these refer to torque and not to energy or moment of mass (as the symbolism ft-lb would properly imply).
Similarly, an inch-pound (or pound-inch) is the torque of one pound of force applied to one inch of distance from the pivot, and is equal to 1 ⁄ 12 lbf⋅ft (0.1129848 N⋅m). It is commonly used on torque wrenches and torque screwdrivers for setting specific fastener tension.
Torque charts are available to specify the required torque for a given fastener based on its property class (fineness of manufacture and fit) and grade (tensile strength). Spring Analogy for a Bolted Joint. When a fastener is tightened, a tension preload is develops in the bolt, while an equal compressive preload forms in the clamped parts.
Four narrow-clearance hydraulic torque wrenches on a flange. A hydraulic torque wrench is a power tool designed to exert torque on a fastener to achieve proper tightening or loosening of a connection through the use of hydraulics. A torque wrench is applied to the nut either directly or in conjunction with an impact socket. Hydraulic torque ...