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Vortex VMRV-40-7.5-56C IEC Metric Worm Gear Reducer - 7.5:1 Ratio, 56C NEMA Frame Spherical Flange Cartridge The BlackStar 2VP56 3/4 TYPEThe Vortex VMRV 40 7. 5 56C is an IEC metric standard worm gear speed reducer with a 7. 5: 1 nominal ratio, a 40 mm (1. 575") center distance, and a NEMA 56C C face input flange. Die cast aluminum housing, hollow output bore for direct shaft mounting. This unit is the direct Vortex equivalent for the Motovario NMRV 040 7. 5 reducer at matching motor frame, designed for replacement of European IEC metric worm gear reducers on existing OEM equipment in