model voltage(dc) no load speed(rpm) stall torque(g.cm) outside dimension(mm) rs-360s/360sm 1.5-36v 3000-28000 120-500 27.7*32.6 rs-365s/365sm 4.8-36v 3000-28000 120-450 27.7*32.6 rs-380s/380sm 2.4-36v 4000-20000 200-1000 27.7*37.8 rs-380sp/380pm 1.5-36v 4000-20000 350-1200 29.0*37.8 rs-385s/385sm 4.8-36v 2500-28000 200-700 27.7*37.8 rs-385sp/385pm 4.8-36v 2500-28000 200-900 29*37.8 rs-390sp/390pm 1.2-36v 5000-32000 250-1400 29*46.5 rs-395sp/395pm 4.8-36v 5000-20000 250-1200 29*46.5 rs-540/540s 1.2-36v 7400-25500 250-2000 35.8*50 rs-540sm 1.2-36v 7400-23200 300-2000 35.8*50 rs-545/545s 3.0-36v 1380-21000 270-2000 35.8*50 rs-550sm/550pm 3.0-36v 3000-27000 1000-4000 35.8*57 rs-555s/555sm 6.0-36v 3000-27000 600-3700 35.8*57 rs-555sp/555pm 6.0-42v 4000-18000 800-3800 37*57 rs-750pm/755pm 3.0-30v 4500-22000 2200-7500 44.4*60 rs-770pm/775pm 3.0-30v 4200-28500 2700-10000 44.4*67 rs-977s 6.0-30v 2500-6800 3000-10000 52.5*80 rs-997s 6.0-30v 2000-20500 2800-11500 52.5*91 rs-5412s/5412sp 100-240v 9000-18000 1000-1400 35.8*50 rs-558sp 100-240v 9000-14500 1300-1900 35.8*50 rs-5512sp 100-240v 7000-19900 900-2200 35.8*50 rs-7712sm/7712pm 100-240v 8500-20000 2400-7700 44.4*67 rs-9712s 100-240v 2900-12000 3900-7800 52.5*80 rs-9912s 100-240v 3400-6000 12000-14200 52.5*91