M Series Memory Flat Beam Torque Wrenches- The Original Torque Wrench
The S/R line of Flat Beam torque wrenches is the direct descendant of those produced by P.A. Sturtevant in the 1930's, and is still among the most accurate and durable of all torque wrenches on the market!

Flat Beams Are Superior
The four most important characteristics of a torque wrench - accuracy, reliability, durability, and low ownership cost, are combined into these exceptional tools. Accuracy is literally ground into the wrench. The special alloy steel beam is ground to a rate of deflection with the use of dead weights, rather than to a dimensional tolerance. This process is time consuming and very labor intensive, but the result is a tool that remains accurate as long as the beam is intact and the pointer is on zero under no-load condition. The flat (actually tapered) shape of the beam insures the beam remains at a right angle to the fastener, reducing or eliminating side-load error. This unique taper grinding distributes stress evenly along the entire length of the beam, extending tool life indefinitely. With a minimum of moving parts, these tools are virtually repair and maintenance free.

M-Series Features

• Incredibly durable design, with a service life frequently measured in decades!
  There are S/R flat beam wrenches in use today that have been used for hourly product testing two shifts per day every week since the 1970's. In 1998 the U. S. Government contacted us to provide a replacement wrench for one they had. It had been in service since World War 2!
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• Very low cost of ownership - exceptional accuracy retention permits extended calibration intervals, and they are virtually maintenance and repair free!
  The simple design and exceptional manufacturing quality on these tools frequently results in the ability to apply calibration intervals of a year or more to them with confidence. This means calibration expense for them is a tiny fraction of that for other direct-reading tools!
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• Ideal for prevailing-torque and destructive testing applications!
  Unlike dial-type wrenches, S/R flat beam wrenches can be used in destructive testing (as on fasteners) without damaging the tool. There are no gears or other delicate mechanisms to suffer from the sudden release of force when the test object breaks. The special alloy steel beam simply straightens out, ready for the next use!
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• Low mass/low inertia design of pointers helps eliminate reading distortion.
  This design virtually eliminates concern about load rate application change affecting the accuracy of the test. Whether the wrench is pulled quickly or slowly, the result is the same, even when the rate of force application varied during the test!
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• Memory feature consists of fingers that follow a track in the scale and remain in place to indicate the maximum torque achieved.
  This permits wrench use in orientations where the scale is not visible, as well as eliminating the need to rely on human memory!
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• Pivoted handles concentrate the applied load (force) at a precise point on the lever to assure torque accuracy.
  The pivoted handles not merely guide the hand to the correct position, but assist in obtaining single-point loading to assure consistent lever length and the accuracy that is derived from it!
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• The S/R flat beam torque wrenches meet or exceed all requirements of ASME B107.14M and ISO 6789.
  This includes the accuracy requirements and all other applicable requirements!
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• Accuracy of S/R flat beams is +/- 2% of Indicated Value from 20% to 100% of wrench capacity in both directions.
  This accuracy is not merely high, it is fully bi-directional and the repeatability is excellent!
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• FREE NIST-traceable tabulated certification included with each wrench!
  This FREE certification includes all calibration readings and all traceability data in an easy-to-read tabulated format. It meets or exceeds the ISO and QS requirements; you receive a high quality tool with documented quality!

The S/R line of flat beam torque wrenches is adaptable for a variety of unusual applications through the use of special interchangeable heads. To see the adapter that allows their use, click here.