Standard Value of Timing Belt Tension: Work zone belt for PCB transfer on Samsung SM321 Tension (N): 17 N (13.5N ~ 20.5N) Frequency (Hz): 177 ± 10% Remarks: Use the U-505(Tension Gage) Standard Value of Timing Belt Tension: Entry/exit belt for PCB transfer on Samsung SM321 Standard Value of Timing Belt Tension: Entry / Exit Belt for Driving Motor on Samsung SM321