Polyester Ropes - Strengths

Polyester 3-strand and 8-strand rope - minimum breaking strength and safe load. Calculate safe mass and load values for different rope diameters.

Rope Diameter (in)	Minimum Breaking Strength (mm)	Safe Load (lbf)	Weight (kN)	Weight (lbf)	Weight (kN)	Weight (lbm/ft)	Weight (kg/m)
3/16	5	765	3.4	63.8	0.284	0.011	0.016
1/4	6	1315	5.85	110	0.487	0.02	0.029
5/16	8	2050	9.1	171	0.76	0.031	0.045
3/8	10	2900	12.9	242	1.07	0.044	0.065
7/16	11	3915	17.4	326	1.45	0.059	0.088
1/2	12	5085	22.6	424	1.88	0.077	0.115
9/16	14	6435	28.6	536	2.39	0.098	0.146
5/8	16	7825	34.8	652	2.9	0.12	0.179
3/4	18	11200	49.8	933	4.15	0.172	0.256
7/8	22	15225	67.7	1270	5.65	0.234	0.348
1	24	19775	88	1650	7.34	0.304	0.452
1 1/16	26	22225	99	1850	8.23	0.342	0.509
1 1/8	28	24800	110	2070	9.21	0.385	0.573
1 1/4	30	29800	133	2480	11	0.465	0.692
1 3/8	32	32500	145	2710	12.1	0.465	0.759
1 1/2	36	42200	188	3520	15.7	0.51	0.997
1 5/8	40	49250	219	4100	18.2	0.67	1.16
1 3/4	44	57000	254	4750	21.1	0.78	1.35
2	48	72000	320	6000	26.7	0.91	1.74

Calculator

Inputs

Safe Load (kN)

Acceleration of Gravity (m/s²)

Results

Maximum Safe Mass-- kg