Wrenches

Wrenches and ratchets accomplish the same job — tightening and loosening fasteners — but there are variances and situations that need one over the other. A box-end wrench, for example, is a fantastic alternative for releasing stuck fasteners since it allows you to apply more force without risking ratchet mechanism damage. A wrench with an open-end fit around a fastener rather than over it, allowing it to be used in places where a socket would not fit. Always be sure the tool you're using is appropriate for the job at hand.

 
• Use the correct wrench for the job.
• Discard any damaged wrenches.
• Wear safety glasses or a face shield.
• Position your body in a way that will prevent you from losing balance.
• Use a box or socket wrench with a straight handle.
• Ensure that the jaw of an open-ended wrench is in full contact.
• Ensure that the teeth of a pipe wrench are sharp and free of oil.
• Apply a small amount of pressure to a ratchet wrench.
• Support the head of the ratchet wrench when socket extensions are used.
• Pull on a wrench using a slow, steady pull.
• Stand aside when work is done with wrenches overhead.
• Make sure adjustable wrenches do not "slide" open during use.
• Keep tools well maintained (cleaned and oiled).
• Clean and place tools and wrenches in a toolbox, rack, or tool belt after use.

Some of the factors to consider in designing or selecting a safe series of wrenches and fasteners include maximum tightening torque, maximum removal torque, minimum torsional strength, and torques from wrench specifications.