A universal joint, (universal coupling, U-joint, Cardan joint, Hardy-Spicer joint, or Hooke's joint) is a joint or coupling in a rigid rod that allows the rod to 'bend' in any direction, and is commonly used in shafts that transmit rotary motion. It consists of a pair of hinges located close together, oriented at 90° to each other, connected by a cross shaft. The universal joint is not a constant velocity joint.

WS universal coupling is suitable for retating system which the two axis angle <45,nominal torque 11.2~1120N*m.

Features of WS universal coupling:

Type	Nominal torque Tn N·m	d H7	D	L0				L		L2	Mass m kg				Moment of inertia I kg·m2
				WSD		WS					WSD		WS		WSD		WS
				Y	J1	Y	J1	Y	J1		Y	J1	Y	J1	Y	J1	Y	J1
WS1 WSD1	11.2	8	16	60	-	80	-	20	-	20	0.23	-	0.32	-	0.06	-	0.08	-
		9
		10		66	60	86	80	25	22			0.20		0.29		0.05		0.07
WS2 WSD2	22.4	10	20	70	64	96	90			26	0.64	0.57	0.93	0.88	0.10	0.09	0.15	0.15
		11
		12		84	74	110	100	32	27
WS3 WSD3	45	12	25	90	80	122	112			32	1.45	1.30	2.10	1.95	0.17	0.15	0.24	0.22
		14
WS4 WSD4	71	16	32	116	82	154	130	42	30	38	5.92	4.86	8.56	0.48	0.39	0.32	0.56	0.49