A single double the points, the maximum rotation angle of each section is 45 degrees 
 WSD is a single cross-type universal coupling, WS-type universal coupling for the double cross 
 Suitable for a variety of general machinery field, the maximum speed of up to 4000 rev / min 
 Needle roller bearings, high dynamic load, the minimum bearing clearance, maintenance-free 
 Finished bore H7, on request, open keyway, six holes and four holes 
 Concentric running high, and long working life