TB 43-0218
SECTION III. INSPECTION AND USE
5. Inspection and Use. Cotter pins, lockwashers, lockwire, locking bolts, locking nuts and similar locking devices shall be
discarded when removed. Self-locking fasteners that loosen up must be replaced, not tightened. Standard (non-locking)
bolts shall be inspected before reuse. Bolts with deformed or damaged threads shall be discarded. Any corroded (rusted)
fasteners should be wiped clean. If the surface of the fastener is pitted or rust is not removed by simple wiping, discard
the fastener. New bolts and nuts shall be examined before use. Bolt shanks (see Figure 1) shall display no apparent
taper. The correct size and grade bolt must be used in each application.
SECTION IV. TIGHTENING METAL FASTENERS
6. Torque Wrenches. Torque wrenches are used to measure the specific degree of tightness during final tightening of
nuts and bolts and should not be used for anything else. Since torque wrenches are considered precision instruments they
must be calibrated at regular intervals to ensure accuracy. Torque wrenches are a combination wrench and measuring
tool. Torque wrenches may be direct reading (dial or gage) or be signaling devices that announce when a predetermined
torque is reached. Torque limits commonly used are in pound inch and pound foot.
Figure 4. Torque Force
Note
To convert pound inches to pound feet, divide by 12.
To convert pound feet to pound inches, multiply by 12.
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