This form with the working load use the steel wire rope:6X37+FC-1670,8X61+FC-1670;
Different construction of the rope means different working load,we can calculate the working load with the wire rope construction that the customer requried.
According to the GB/T16271-1996 Standard

Item.No	Dia of Rope(mm)	WLL       (KN)	rings parameter AxBxd (mm)	hook
				Model No.	WLL(t)
SLNCSSH06	6	2.7	65x130x16	US S6	0.75
SLNCSSH07	7	3.6	65x130x16	US S6	0.75
SLNCSSH08	8	4.7	65x130x16	US S6	0.75
SLNCSSH09	9	6	65x130x16	US S6	0.75
SLNCSSH10	10	7.4	65x130x16	US S6	0.75
SLNCSSH11	11	8.9	65x130x16	US S6	1
SLNCSSH12	12	11	65x130x16	US S6	1.5
SLNCSSH13	13	12	65x130x16	US S6	1.5
SLNCSSH14	14	14	65x130x16	US S6	1.5
SLNCSSH16	16	19	65x130x16	US S6	2
SLNCSSH18	18	24	80x150x20	US S6	3
SLNCSSH20	20	30	80x150x20	US S6	3
SLNCSSH22	22	36	90x160x24	US S6	5
SLNCSSH24	24	42	90x160x24	US S6	5
SLNCSSH26	26	50	90x160x24	US S6	5
SLNCSSH28	28	58	100x190x28	US S6	7.5
SLNCSSH30	30	66	100x190x28	US S6	7.5
SLNCSSH32	32	76	100x190x28	US S6	10
SLNCSSH34	34	85	110x200x32	US S6	10
SLNCSSH36	36	96	110x200x32	US S6	10
SLNCSSH38	38	106	120x230x34	Eye	15
SLNCSSH40	40	118	120x230x34	Eye	15
SLNCSSH42	42	130	135x250x38	Eye	15
SLNCSSH44	44	143	135x250x38	Eye	15
SLNCSSH46	46	156	140x270x42	Eye	37
SLNCSSH48	48	170	140x270x42	Eye	37
SLNCSSH50	50	185	140x270x42	Eye	37
SLNCSSH52	52	200	140x270x42	Eye	37
SLNCSSH54	54	215	140x270x42	Eye	37
SLNCSSH56	56	231	160x310x46	Eye	37
SLNCSSH58	58	248	160x310x46	Eye	37
SLNCSSH60	60	266	180x330x52	Eye	37