The MMTB is miniature preset production torque wrench with a fixed head. The versatile wrench, from Mountz Inc., is available with different head configuration options, like open, box, flare, hex key and ratchet head. MMTB models are designed to have one permanent head style attached to it. When the MMTB torque wrench achieves torque, the head breaks-over signaling to the operator to stop applying torque to the fastener or bolt.

Break-Over torque wrenches are essential to limiting the amount of torque applied to an assembly or fastening. Break-over torque wrenches, typically deflect 20-90 degrees on torque delivery, thus indicating torque has been reached. Many break-over wrenches require manual resetting, while others have an automatic resetting feature.

The slim MMTB torque wrench is a pre-set tool that offers a tamper-proof internal torque adjustment setting. There is no external adjustment scale, so the wrench must be preset using a torque tester. Small with a lightweight aluminum handle, the MMTB wrench is ideal for applications with limited space. Mountz offers various MMTB wrench models covering a torque range of 1 inch-ounce up to 80 inch-ounces.

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A manufacturer of large industrial gas engines had a torque application for fastening an industrial engine block in a washing chamber after the milling process. The large gas engines are designed and built for demanding applications in waste water treatment plants, power plants, oil & gas fields and other energy applications all over the world.

The engineers were using impact wrenches for the fastening application, but the impact tools were damaging the threads in the engine block due to the lack of proper torque control. An impact wrench is destructive by nature with its “hammering” design. These tools are not ergonomically friendly to an operator and require a high maintenance budget.

A hydraulic wrench was the next tool that the engineers tried using for the fastening application, but it was increasing the manufacturing time significantly and increasing costs. Hydraulic wrenches are notorious for their heavy ratchets, bulky compressors and laborious operation. Hydraulic tools operate through a hydraulic ram that extends and retracts, ratcheting the head. This is a long and tedious process that requires the operator to activate and stand by the pump with a hand-held controller.

The engineers contacted Mountz Inc. and inquired about other cost effective torque control solutions that were available to resolve their fastening application. Mountz demonstrated the CLDpneumatic torque multiplier as an option to resolve their critical torque application issue. The CLD torque multiplier shuts-off when the pre-set torque is achieved. It’s a non-impacting tool and operates at a smooth, continuous rotation. The engineers approved the torque multiplier for their application.

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Mountz, Inc. offers a couple of torque tool options for ensuring the correct torque is applied for applications that involve RF/COAX & SMA Connectors. The correct tightening of COAX and SMA Connectors used in RF cabling applications is essential to ensure optimum performance. This is particularly important in high frequency applications using stainless steel or beryllium-copper bodies.

The general thought is that hand tightening of RF/COAX cables or SMA connectors are acceptable. It is not. Over-torque can crush the insulation, as well as the center contacts and ground mating surfaces. Any change to those can alter the impedance and VSWR signal. Under torque can be just as bad if an air-gap is left in the insulator, or the center pin or ground-mating surface isn’t fully engaged.

If manufacturers and operators want to “do it right,” then they need to find a torque tool that’s designed specifically to prevent over-tightening for RF/COAX and SMA connectors. The torque tool should be designed to limit the amount of torque applied to an assembly or fastening application and minimize the shock to assembly.

Mountz Inc. offers TB Break-Over wrenches and Hand Torque Screwdrivers that can be used for accurately tightening COAX and SMA connectors and ensuring that over tightening doesn’t occur. The TB is commonly used with an open-ended spanner, while the pre-set torque screwdriver with a Crowsfoot Spanner Head enables vertical access in places where conventional torque tools cannot be used. The Spanners are available to suit the standard sizes of all the major connector manufacturers.

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