nema size 08 frame size 20mm, motor length 28mm Model, SM20HT28, 2 phase Holding torque 160g.cm, 0.2A/phase CE, RoHs Single ShaftDouble ShaftVAΩmHOz-ing-cmKgmmSM20HT28-0204ASM20HT28-0204B4.80.2248.02.216040.0528 SM20HT28-0204 nema 8 mini stepping motor, motor frame size 20mm and motor length 28mm