Ansi torque-tightening standards

Written by tamara wilhite
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Ansi torque-tightening standards
Torque wrenches control how tightly a nut or bolt is screwed in. (Jupiterimages/ Images)

The American National Standards Institute (ANSI) issues torque-tightening standards that ensure that bolts and fasteners are neither too loose nor over-torqued so tightly that the fastener or bolt will fail. To ensure accurate torquing, ANSI has also prescribed testing of torque wrenches used to tighten fasteners and testing fasteners for their ability to withstand loads.

ANSI Torque Standards

Standard ANSI/ASME B18.16M gives the dimensional and structural requirements for torque-type nuts. ANSI standard B7.1 states that applied torque should not exceed 20 foot pounds. ANSI/SCTE standard 29 determines the torque standards for bond wire, which must be torqued until wire penetration is 25 +/-1% of the wire's outer diameter.

Torque Wrench Testing

ANSI/SCTE standard 149 defines the test method for how fasteners withstand torque. The torosional strength of torque wrenches is tested according to ANSI standard B18.6.4. This standard was set up the American Society of Mechanical Engineers (ASME) and then adopted directly by ANSI.

Torque Wrench Calibration

Torque wrenches are used to apply a specific tension on fasteners. ANSI/NCSL Z540-1-1994 calibration standards' "Handbook of Aeronautical Inspection and Pre-Purchase" by Denny Pollard says "American National Standards Institute (ANSI) standards require a torque wrench to maintain accuracy through 5000 cycles". ANSI/NCSL Z540-1 has been replaced by ANSI/NCSL 540-3.

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