10 Apr Wrench Safety

Wrench Safety

Wrenches are among the most commonly used hand tools, but improper selection or use can result in crushed or cut fingers, injured knuckles, muscle strains, falls, and other injuries. Using the correct wrench and keeping it in good condition can prevent many of these incidents.

Guide for Discussion

Inspect and Maintain Wrenches

Inspect wrenches regularly and before use. Look for:

• Sprung, spread, cracked, or damaged jaws.
• Worn or rounded gripping surfaces.
• Bent or damaged handles.
• Cracks or other defects that could cause the wrench to fail.
• Oil, grease, or other substances that could cause your hand to slip.

Remove damaged wrenches from service. Keep wrenches clean, dry, and properly maintained.

Use the Correct Wrench

Always select the correct type and size of wrench for the job.

• Make sure the wrench fits the nut or bolt properly.
• Never use shims to make an oversized wrench fit.
• Use metric wrenches on metric fasteners and correctly sized SAE wrenches on SAE fasteners.
• Do not substitute pliers or another inappropriate tool when the correct wrench is available.
• Never use a wrench as a hammer.

Using the wrong size or type of wrench increases the likelihood of slipping and damaging the fastener.

Use Wrenches Properly

• Position the wrench securely on the fastener before applying force.
• Pull the wrench toward you whenever practical rather than pushing it away.
• Maintain firm footing and good balance.
• Keep your hands and knuckles clear of nearby objects in case the wrench slips.
• Apply steady, controlled pressure rather than sudden force.
• Never strike a standard wrench with a hammer unless the wrench is specifically designed for striking.
• Do not place a pipe or other extension over the handle for additional leverage unless the wrench is specifically designed for use with an extension.
• Use penetrating oil or another approved method for stubborn or rusted fasteners.

If excessive force is required, stop and determine whether a different tool or method should be used.

Avoid Strains and Falls

Wrenching tasks can require considerable force and may place stress on the hands, arms, shoulders, and back.

• Position yourself so you can work without excessive reaching or twisting.
• Maintain stable footing before applying force.
• Do not overextend yourself to reach a fastener.
• Be prepared for sudden movement if the fastener breaks loose.
• Use a longer wrench designed for greater leverage when appropriate rather than improvising with a cheater bar.

Never use a wrench on moving or energized equipment unless the work is specifically authorized and appropriate safeguards are in place.

Remember

A wrench is safe only when it is the correct tool, in good condition, and used properly. Inspect it before use, select the correct size, maintain stable footing, apply controlled force, and never improvise to gain additional leverage.