100mm/4inch Stroke Heavy Duty DC 12V Load Linear Actuator Electric Motor Features: Electric putter, also known as push rod motor, electric cylinder and linear actuator. The electric putter is an electric drive that converts the motor's rotational motion into a straight reciprocating motion of the push rod. Can be used in a variety of simple or complex process as the implementation of mechanical use, in order to achieve long-range control, centralized control or automatic control. Main use: electric bed, electric sofa, electric stand lift rod, industrial electric lift system, camera frame, video machine, wedding system. How it works:After the motor is slowed by the gear, drive a pair of screw nuts. The motor rotation into a linear motion, the use of motor reversal to complete the putter action. Such as through a variety of lever, rocker or connecting rod and other institutions to complete the rotation, shake and other complex movements. Low noise design,noise level is ≤ 50dB. Specifications: Size: Approx. 20.5 x 4.0 x 7.5cm/8.1 x 3 x 1.6inch Weight: 1070 g Maximum thrust: 750N Standard Stroke: S = 100mm Minimum distance (the distance between the front and rear of the two holes) :L = S(stroke)+ 105mm putter between two holes = 2XS(travel)+ 105mm No load speed: 10mm/s  Speed and thrust relationship: 5mm / s (kg) -50s (50kg) Standard protection level: IP54 Noise level: ≤50 dB Package Included: 1 x Electric Linear Actuator Motor 2 x Bracket 2 x Bolt 2 x Cotter Pin for the Linear Actuators