SSI Technologies Inc., Janesville, Wis., won the Hardware/Appliances award of distinction for PM and MIM parts used in tactical hinge-style handcuffs made by ASP Inc., Appleton, Wis., a law enforcement products supplier. The handcuffs use 14 PM parts processed by conventional or high-temperature sintering. Five are different designs — a lock pawl, bow, side and center links, and main links. The bow has a tensile strength of 103 kpsi, and has a large 0.090-in. radius in the areas where it touches the wearers wrist. These radii had been machined in the previous design. Twelve parts are made from three stainless steel materials and two parts are made from MPIF FD-0405-60 steel. The four main links are made by MIM to a minimum density of 7.5 gm/cm3 and have a tensile strength of 78 kpsi. Three modified 316 stainless steel parts and two duplex stainless steel MIM parts make up the linkage assembly. The patent-pending design lets the assembly be swaged together without rivets.



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