Proper useEdit
The movable jaw should be snugly adjusted to the nut or bolt head in order to prevent damage to the fastener's head, or rounding. In addition, it is important when applying significant force to ensure that the fixed jaw "leads" the rotation (it follows its tip) and the movable jaw "trails" the rotation, leaving its tip behind, so to speak. The area of contact for the fixed jaw should be farther from the body of the tool. That means the movable jaw's area of contact is relatively close to the body of the tool, which means less bending stress. The fixed jaw can withstand bending stress far better than can the movable jaw, because the latter is supported only by the flat surfaces on either side of the guide slot, not the full thickness of the tool.
This type of spanner should not be used on a rounded off nut, as this can overload the movable jaw. Nor should such a wrench be used "end on" in cramped quarters (except perhaps when the nut is barely more than finger-tight), where a ratchet is more appropriate.
Some cheaper brands' jaws move when twisting on tight nuts.
Famous brandsEdit
In the United States and Canada, the adjustable spanner (adjustable wrench) is colloquially referred to as a "crescent wrench" due to the widespread Crescent brand of adjustable wrenches. The Crescent brand of hand tools is owned and marketed by Apex Tool Group, LLC. In some parts of Europe, adjustable spanners are often called a Bahco.[3] This term refers to the company of the Swedish inventor Johan Petter Johansson, which was originally called B.A. (Bernt August) Hjort & Company. The Swedes themselves call the key "skiftnyckel" which is translated into adjustable key (shifting key).
Proper useEdit
The movable jaw should be snugly adjusted to the nut or bolt head in order to prevent damage to the fastener's head, or rounding. In addition, it is important when applying significant force to ensure that the fixed jaw "leads" the rotation (it follows its tip) and the movable jaw "trails" the rotation, leaving its tip behind, so to speak. The area of contact for the fixed jaw should be farther from the body of the tool. That means the movable jaw's area of contact is relatively close to the body of the tool, which means less bending stress. The fixed jaw can withstand bending stress far better than can the movable jaw, because the latter is supported only by the flat surfaces on either side of the guide slot, not the full thickness of the tool.
This type of spanner should not be used on a rounded off nut, as this can overload the movable jaw. Nor should such a wrench be used "end on" in cramped quarters (except perhaps when the nut is barely more than finger-tight), where a ratchet is more appropriate.
Some cheaper brands' jaws move when twisting on tight nuts.
Famous brandsEdit
In the United States and Canada, the adjustable spanner (adjustable wrench) is colloquially referred to as a "crescent wrench" due to the widespread Crescent brand of adjustable wrenches. The Crescent brand of hand tools is owned and marketed by Apex Tool Group, LLC. In some parts of Europe, adjustable spanners are often called a Bahco.[3] This term refers to the company of the Swedish inventor Johan Petter Johansson, which was originally called B.A. (Bernt August) Hjort & Company. The Swedes themselves call the key "skiftnyckel" which is translated into adjustable key (shifting key).
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