Clamps are commonly used to hold materials in place while they are being shaped, cut, drilled or glued. Clamps function as extra sets of hands and can be found in every shop or garage. There are many types of special purpose clamps, such as box clamps, miter clamps and band clamps, but most tasks can be performed with clamps of a more general nature.
C-clamps get their name from their shape, which resembles the letter C. A threaded rod passes through one arm of the clamp and terminates in a swiveling disc or pad. As the rod is turned, the swiveling disc is forced ever closer to the opposing arm of the clamp. Materials between the disc and the clamp arm are forced together by rotating the threaded rod. C-clamps come in many sizes and are probably the most common clamps in use. Craftsman C-clamps are made of ductile iron and are produced in 6-inch, 2-inch and 1-inch jaw widths.
Bar clamps have a single movable arm that slides along a flat metal bar affixed to the second arm of the clamp. They ratchet tight by the repeated activation of a trigger mechanism that causes the movable arm to slide along the bar. They usually have a quick release feature that instantly releases the clamp and allows the movable arm to slide freely along the bar. These clamps are very popular because they are available with very wide working spans. Sears carries more than 15 different sizes of Craftsman bar clamps.
The third most common clamp in use is the spring clamp. These clamps are similar in operation to spring-style clothes pins, but they are much more powerful and are typically made of metal. A spring holds the clamp shut. Squeezing the handgrips forces the jaws open against the spring, and releasing them allows the clamp to close again. The jaws are usually padded to protect project materials from damage. Craftsman spring clamps are available individually and in sets.
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