A torque wrench (Torque Wrenches) is a tool used to precisely apply a specific torque to a fastener such as a nut or bolt. It is usually in the form of a socket wrench with special internal mechanisms. It was invented by Conrad Bahr in 1918 while working for the New York City Water Department. It was designed to prevent overtightening bolts on water main and steam pipe repairs underground.
A torque wrench (Torque Wrenches) is used where the tightness of screws and bolts is crucial. It allows the operator to measure the torque applied to the fastener so it can be matched to the specifications for a particular application. This permits proper tension and loading of all parts. A torque wrench measures torque as a proxy for bolt tension. The technique suffers from inaccuracy due to inconsistent or uncalibrated friction between the fastener and its mating hole. Measuring bolt tension (bolt stretch) is more accurate but often torque is the only practical means of measurement.
There are several kinds of Torque Wrench, including hydraulic torque wrench, digital torque wrench, mannual torque wrench, eletronic torque wrench, inch pound torque wrench
Torque wrench calibration is important to the safety and effectiveness of your home and car repairs, as well as the functionality of the torque wrench (inch pound torque wrench) itself. Use your torque wrench (torque wrench inch pounds) safely and effectively by calibrating it at home to suit your needs.
Instruction:
1. Mark the center point of the wrench head on the back of the torque wrench. Use a a pencil or marker.
2. Measure from the center point to the point at which you apply the most pressure when using the wrench. Write down this measurement as "Distance 1" either in inches (if your wrench measures in inch pounds) or feet (if your wrench measures in foot pounds).
3. Clamp the wrench bit in a vise horizontally. Using string, hang a 20-pound weight from the handle of the wrench.
4. Move the weight along the handle of the wrench until it measures exactly 40 foot pounds or 480 inch pounds. Measure the distance from the center point on the head of the wrench to the string and write this measurement down as "Distance 2."
5. Divide "Distance 2" by "Distance 1" with the calculator to find the calibration ratio. This ratio is the difference between the the settings on your wrench and the actual force needed to acquire a "click" at that setting.
6. Set your torque wrench for a specific application by multiplying the required torque of the bolt by the calibration ratio. For example, if a bolt requires 43 foot/pounds of torque and the calibration ratio is 1.124, multiply 43 times 1.124 and set your wrench to 48.3 foot/pounds.
How to Use a Torque Wrench?
You can follow many video step by step as the following:
www.youtube.com/watch?v=zgwwOJ0B964
www.youtube.com/watch?v=187IHhDF9qE
ww.ehow.com/video_4754045_use-torque-wrench.html
http://www.6crew.com/forum/showthread.php?19153-How-to-use-a-torque-wrench-%28yeah-it-s-basic.....but-fundamentals-are-paramount%29
Where to find the best torque wrench?
We suggest shopping online at Amazon.com
view the most popular manual torque wrenches on Amazon.com here
view the most popular Electronic torque wrenches on Amazon.com here
view the most popular digital torque wrenches on Amazon.com here
There are many Torque Wrenches at Amazon.com
Mountain 16250 1/2-inch Drive Torque Wrench - 25-250 ft/lbs
Product Specifications:
Length: 3.10 inches
Width: 2.80 inches
Height: 26.10 inches
Ratcheting click style torque wrench for tight places
Wrench is 25" long
Comes in a blow molded case for easy storage
Product Description
The Mountain ratcheting click style torque wrench is 10" long and designed to be used for 25-250 ft/lbs.
Most Torque Wrench reviewers on this product agree that it's a good value, the following is some reviews:
I like it! Very sturdy wrench, steel, steel, steel, no plastic anywhere. Makes a definite sharp click when you arrve at the torque setting. Get ready for the size, it is quite large and heavy. Lots of leverage. Set screw to hold the torque setting is a nice touch. -by C. J. Brown
I have bought many tools over the 40 years I have been messing with cars. I needed a big torque wrench to tighten the spindle nuts on the Cobra replica I built and picked this one for its capability and price. It is the first time I received a calibration sheet with a torque wrench, even the Craftsman tools I have bought never came with one. Good basis torque wrench with great features. Give me a mechanical wrench over an electronic one any day. Great quality!! by 55 and kicking
All I Gott Say That It Is Better Than Buying A Snap On Or Other Big Brands..Worth Buying ...Red Case Though Not Black.. by eddy_764
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