PK Series Performance Overview
Gearhead Size Nominal Output Torque
Nm
Torsional Backlash¹
arcmin
Input Speed Max. (Cyclic)
rpm
Axial Load Max.
N
Radial Load Max.²
N
Torsional Stiffness
arcmin
P521_K1 210 ≤5 6000 R:2300;  D:3500;  Z:1600 R:6500;  D:7000;  Z:8000 ≤26
P721_K1 440 ≤4 6000 R:2900;  D:4500;  Z:2000 R:8000;  D:9000;  Z:10,000 ≤46
P721_K2 440 ≤4.5 5500 R:2900;  D:4500;  Z:2000 R:8000;  D:9000;  Z:10,000 ≤45
P821_K2 1000 ≤3.5 5500 R:4700;  D:7500;  Z:3600 R:13,000;  D:15,000;  Z:18,000 ≤64
P821_K3 1000 ≤4.5 5000 R:4700;  D:7500;  Z:3600 R:13,000;  D:15,000;  Z:18,000 ≤108
P921_K4 2000 ≤3.5 5000 R:6000;  D:10,000;  Z:5000 R:18,000;  D:20,000;  Z:27,000 ≤247
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.
2)  Rating based on output speed (n2) of 100 RPM.

Output Bearing Options

bearings
Output Shaft Load

radial axial