Problem: Analysis was needed to determine weak points in a wrench design which would allow Main Corporation to make changes needed to meet American National Standards Institute (ANSI) standards for strength and life requirements for socket wrenches.
Solution: Main Corporation designed a new socket wrench that performs low- torque bolt spin-offs and spin-ons as well as high torque loosening and tightening for USAF quick change maintenance. Air Force Research Laboratory Air Vehicles Directorate (AFRL/VA) engineers tested a prototype for strength and found it met all ANSI standards. The engineers also tested production prototypes which indicated they met the minimums.
The wrench has a center shaft inside a hollow handle that allows one to turn loose nuts without moving the handle. This wrench allows one to loosen tight nuts in the traditional crank and ratchet way, and extract loose nuts, turning the center shaft. Automobile mechanics and plumbers find it ideal for tight spaces. Drivers and homeowner's find it ideal for "clean hands, clean clothes" operation.
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