Fastener Torquing - GE H301 Series Operating Manual

28 | Chapter 3: General Data/Specifications

Fastener Torquing

Follow the torque wrench manufacturer's instructions to
To ensure that fastener tightening is accurate and design torque values are
properly applied.
1. A calibrated torque wrench must be properly used to achieve the required
fastener torque for critical parts assembly.
2. Select a torque wrench appropriate for the lbs/ft., lbs/in. or Nm. range
specified for the fastener. For higher torque values, a torque multiplier may be
required. Before use, always verify the torque multiplier's actual mechanical
advantage from the manufacturer's literature.
Follow the torque wrench manufacturer's instructions to
3. Fastening hardware's threads and contact surfaces are to be clean and free
of burrs or dings. This includes bolt, stud and nut threads, along with washer,
nut, bolt head and associated contact surfaces. Generally, the fastener should
be capable of being "hand assembled" with a minimum of force. Generally,
fasteners should be installed with some radial clearance. Avoid placing the
fastener threads in shear or loaded against one side of the fastener's hole.
4. Torque values are generally based upon the use of petroleum-based
lubricants, with lubricant being applied to fastener's threads and seating
surfaces. Use of the compressor sump's SAE 40 WT oil is preferred, unless
otherwise specified.
Friction reducers, such as Never-Seize or Molykote ® P-37,
5. When using a torque wrench apply a slow and steady force until the set value
is achieved.
6. To verify a torque value, slowly apply a steady and slow force until the click is
heard or felt. Always reduce the spring tension to its minimal value. The torque
wrench's calibration accuracy will be affected if it is left with a high spring
tension setting for long periods of time.
7. Unless checking loosening torque values on critical fasteners, do not routinely
use a torque wrench when breaking fasteners loose. Regular use of torque
wrenches to rapidly loosen fasteners can overload the wrench and affect its
properly operate a torque wrench.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (9)
properly operate a torque wrench.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (9)
are not to be used unless specifically designated.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (9)