PHK Series Performance Overview
Gearhead Size Nominal Output Torque
Nm
Torsional Backlash¹
arcmin
Input Speed Max. (Cyclic)
rpm
Input Speed Max. (Continuous)
rpm
Axial Load Max.
N
Torsional Stiffness
arcmin
PH521_K1 220 ≤4 6000 4000 4150 57
PH721_K1 440 ≤4 6000 4000 6150 102
PH721_K2 440 ≤4.5 5500 4000 6150 97
PH821_K2 990 ≤3.5 5500 4000 10,050 227
PH821_K3 1250 ≤4 5000 3800 10,050 168
PH931_K5 3000 ≤4 4500 3400 33,000 728
PH1031_K6 5000 ≤4 4000 3100 50,000 1206
Notes
1)  Tested at 1.5% of nominal torque and recorded on the output side of the gearhead. For lower backlash, contact STOBER technical support.