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Vortex VMRV-50-40-56C IEC Metric Worm Gear Reducer - 40:1 Ratio, 56C NEMA Frame teeth-18 12/C240 is a banded v-beltThe Vortex VMRV 50 40 56C is an IEC metric standard worm gear speed reducer with a 40: 1 nominal ratio, a 50 mm (1. 969") 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 050 40 reducer at matching motor frame, designed for replacement of European IEC metric worm gear reducers on existing OEM equipment in the 1