Spiral Strand

This construction consists of layers of round wires helically spun together in a similar manner to the locked coil rope, but, owing to the round wire as opposed to the 'Z' shaped wires, has slightly lower modulus and fill factor values than the locked coil rope. Nevertheless, it still has good modulus, axial stiffness and tension-tension fatigue properties which, combined with its greater flexibility, render this a very versatile and popular construction for structural applications.

Nominal Diameter	Metallic Cross-Section	Elastic Stiffness (EA) +/- 5%	Minimum Breaking Force 1570 Tensile Grade	Minimum Breaking Force 1670 Tensile Grade	Mass
mm	mm2	MN	kN	kN	kg/m
10	59.7	10	85	202	0.5
12	86	14	120	228	0.71
14	117	20	165	258	0.97
16	152	25	215	289	1.27
18	192	31	270	322	1.60
20	237	39	335	357	1.98
22	286	46	405	430	2.40
24	341	55	480	512	2.85
26	400	64	565	601	3.35
28	464	74	655	697	3.88
30	532	85	750	799	4.46
32	605	96	855	909	5.07
34	683	109	965	1030	5.72
36	766	122	1080	1150	6.42
38	853	136	1200	1280	7.15
40	945	151	1330	1420	7.92
42	1040	166	1470	1570	8.73
44	1140	182	1610	1720	9.58
46	1250	200	1760	1880	10.5
48	1360	217	1920	2040	11.4
50	1480	236	2080	2220	12.4
52	1600	256	2250	2400	13.4
54	1720	275	2430	2590	14.4
50	1850	296	2560	2720	15.5

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