Description MKS HV747 Coreless Mini High Torque 8.4V Digital Servo SKU  MKS-HV747 Dead Band  0.001ms Working Frequence  1520μs / 333hz Operating Voltage  5.5 ~ 8.4 V DC Volts (2S Lipo un-regulated) Operating Speed (6V)  0.17s Operating Speed (7.4V)  0.14s Operating Speed (8.4V)  0.13s Stall Torque (6V)  11.8kg/cm Stall Torque (7.4V)  13.8kg/cm Stall Torque (8.4V)  15kg/cm Motor Type  Coreless Motor Gear Type  Chrome-Titanium alloy gear Connector Wire Length  29.5 cm Dimensions  35.5 x 15 x 28.5 mm Weight  38.55g See aditional images for dimensions. Note: All Standard and mini servos except the X8 range (HBL380, HBL850, HBL880) use a 6mm 25tooth spline, same as Futaba. Micro and wing servos all use a MKS 5mm spline.