Wrench Socket

Wrench Socket

The Nuts And Bolts On Torque Wrenches

A wrench that is used to set the torque of a fastening such as a nut or bolt to a great degree of precision is called a torque wrench. It is actually a socket wrench that comes with special internal mechanisms and is of great use where you need to be absolutely sure about the tightness of the screws and the bolts. You can measure how much torque is applied so that you are sure that the tightness is up to the specifications. So, you can ensure that there is proper loading and tension of all the parts. So indirectly, it is measuring bolt tension. However, thanks to the friction between the mating hole and the fastener, this technique does suffer from inaccuracy sometimes. So it is better to measure the bolt tension or the bolt stretch and very often torque is the only measurement that is possible and accurate.

Let's take a look at what it looks like. The simplest one is a long lever arm that runs between the handle and the wrench head and is made of a material which bends elastically under the applied torque. There is a second arm which is smaller and it carries an indicator which is connected from the head and is parallel to the lever arm. This remains straight and there is no strain that it suffers from at all. The handle has a calibrated scale fitted to it and as the main lever bends, the scale moves. As soon as the desired torque is achieved, the operator stops applying pressure. This is an extremely simple device but also very precise.

You do get more sophisticated versions where a calibrated clutch mechanism is used. As soon as you get the desired torque, a clutch slips and you prevent over tightening. The most common one uses a ball detent and spring and the spring comes preloaded with an adjustable screw thread and this is calibrated in torque units. This ball detent uses force till you get the desired torque and then the spring is released and the balls clicks out of the socket. There are quite a few variations to this design and you have a whole range of them for various applications and sizes. This design is, in fact, modified and used in drills to prevent the gouging-out of the heads of screws while tightening them.

What are the differences between these different types of torque wrenches? You do get better precision when they have been calibrated well but when the mechanism is complex, they can end up losing their calibration pretty quickly. The beam type on the other hand does not have too many parts that can malfunction as it is a more mechanical operation. However, in some situations, the beam type torque just cannot be read and therefore is not used. Further, the scale is sometimes prone to parallax error because there is such a long distance between the indicator arm and scale. There could also be increased user error with this type as you have to read it off each time. When it comes to the click type, remember to remove the force from the spring and set the scale to zero when it is not in use.

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Socket Wrench $68.51 High Quality Content by WIKIPEDIA articles A socket wrench, more commonly referred to as a ratchet, is a type of wrench, or tightening tool, that uses separate, removable sockets to fit many different sizes of fittings and fasteners, most commonly nuts and bolts.The socket wrench includes a ratcheting mechanism that allows the nut to be tightened or loosened with a reciprocating motion, without requiring that the wrench be removed and refitted after each turn. Typically, a small lever behind the socket switches the wrench between tightening and loosening mode. The sockets are attached to the ratchet through a square fitting that contains a spring loaded ball detent mechanism to keep the sockets in place. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 84 Publication Date: 2010/08/24 Language: English Dimensions: 6.00 x 9.02 x 0.20 inches

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Double End Tubular Angled Socket Wrench (Hex 13mm) $8.99 Description:Chrome vanadium steel material Angled Socket WrenchThis Hex Double End Wrench is hot upset forged, giving a unique grain pattern and upgraded performanceUnique designed open hole on the angle socket end allows access to nuts fitted onto protruding threadsDeep profile grooves and the additional open end to the sockets provide an answer to most problems of accessibility, even with extra-long studsThe angle and through-hole of Hex Tubular Wrench are designed to accomodate long threads or a bar for additional torque without affecting tool strengthHex socket size: 13mmLong shaft length: 145mmShort shaft length: 40mmWeight: 157g