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Crescent wrenches originated from the Crescent Tool Company, featuring one fixed and one movable jaw for adjustable grip.
There were historically four basic types of crescent wrenches, varying in size and design, including double-ended adjustable wrenches and single-ended models in lengths from 6 to 12 inches (15 to 30 cm).
When using an adjustable wrench, it's crucial to pull toward yourself to avoid slipping and potential injury. Ensure the jaws tightly grip the bolt or nut and always position the sliding jaw toward you for optimal pressure and safety.
Although the term "crescent wrench" is thrown around as though it were a type of tool, crescent wrenches got their name from the Crescent Tool Company in the early s. It was first created by inventor Karl Peterson, although a wrench by the Swedish company BAHCO may have inspired Peterson's design. The term crescent wrench has since become a generic name for a type of adjustable wrench. Crescent wrenches have one fixed jaw and one movable jaw; they differ from monkey wrenches in that the jaws on a crescent wrench are nearly parallel to the handle, whereas the jaws on a monkey wrench are perpendicular to the handle. In both types, the jaws are adjusted using a worm gear that you turn with your thumb.
Crescent-brand wrenches come in all forms nowadays, but there were four basic historic types of Crescent wrench: the 8-to-10-inch double-ended adjustable wrench; the 6-to-8-inch double-ended adjustable wrench; the 8-inch adjustable wrench; and the 12-inch adjustable wrench. They differed in size, jaw opening and whether they had one set of jaws on one end, or a set on each end.
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Over time, adjustable wrenches acquired the nickname of "knucklebuster" because of the tendency of the jaws to slip off whatever you're loosening, causing you to scrape your hand against the nearest surface. That's why it's important when you're using an adjustable wrench that you position the wrench so that you're pulling toward yourself and not a potentially dangerous knuckle-busting surface. Other important adjustable-wrench rules are that the jaws should tightly hug at least three points on the nut or bolt you're loosening so you have a good grip; that you retighten the jaws any time you move the wrench to a new position; and that you position the sliding jaw so that it faces you in order to put the most pressure on the fixed jaw.
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Types of Wrenches
The adjustable wrench isn't a precision tool but it&#;s very versatile. The jaws adjust to fit various fasteners, and allow for quickly resetting your grip. When using one, apply the pressure against the fixed jaw so you won&#;t break the moving joint.
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The pipe wrench is a heavy-duty wrench used especially for plumbing and heating projects. It&#;s designed to dig in and create its own teeth marks in pipe and then release. This is the tool needed for removing a radiator or running gas pipe to a gas grill. But, it&#;s not the best choice for decorative plumbing - the teeth will mar your finish.
Offset wrenches are another variation of the combination wrench. They that allow a little extra clearance in hard to reach areas.
A ratchet and socket is used in many of the same applications as the combination wrench but, it is faster because the wrench doesn&#;t have to be removed after every turn. Tighten and loosen fasteners by flipping the lever to reverse the action. Each socket has standard and metric increments to match the precise diameter of the fastener.
Deep well sockets allow for extra stability when tightening a long fastener or tightening down a bolt over a long thread.
Pass-through sockets have an open back to let bolt slack slip through. The fewer points of contact inside the socket, the more torque you can apply. 6 point sockets are the pro&#;s choice because they can handle the most force. 12 point sockets are common in a do-it-yourself toolkit. A universal socket has more teeth inside - so it adapts to more bolt sizes.
A torque wrench is used when a precise amount of torque needs to be applied to a fastener. You set the wrench or read the gauge to apply the correct amount of torque to the fastener as recommended by the manufacturer, usually in an owner&#;s manual. It is used a lot in automotive repair, and some other common types of machinery like a lawnmower.
Be aware that stubborn bolts can give way suddenly. It&#;s usually best to pull toward you, vs. pushing.
For beginners, a socket wrench set will probably work for most jobs. If you&#;re an avid do-it-yourselfer, you probably want combination wrenches too. They&#;ll get into tighter spots and offer the most leverage for tougher jobs.
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