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What Are the Parts of a Crescent Wrench?

What Are the Parts of a Crescent Wrench? thumbnail
What Are the Parts of a Crescent Wrench?

The Crescent wrench, produced by Cooper Tools, has three main parts and is available in a wide range of fully adjustable sizes.

  1. Spanners

    • Open jaw spanner wrenches ordinarily are cast or forged to fit one size of nut. The Crescent wrench is an adjustable design, with jaws that open from zero to the maximum jaw opening.

    Three Key Parts

    • As described in the original patent by Hsieh Chi-Ching of Fong Yuan City, Taiwan, the Crescent wrench's main part is the handle with incorporated fixed jaw. Within this main section is also an aperture for a worm screw and a locking lever to fix the adjustable jaw in position.

    Locking Lever

    • Most Crescent wrenches sold today are simpler than the original patented concept. The locking lever that was to hold the movable jaw in place is no longer a part of the tool.

    Size Limitations

    • Although a crescent wrench is adjustable over a wide range, the physical size of the tool is limiting. Small versions lack the leverage needed for larger nuts, and large versions may not fit the available space in which to work.

    Slack

    • Without the locking lever intended by Hsieh, the setting of the movable jaw will wander. Constant readjustment is necessary or parts being worked upon may be damaged by the poor fit.

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  • Photo Credit Photo by JTH at http://www.jamestwohats.com/jthbackpacking/index.html

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