Wire rope slings

 

Working Load Limit (WLL)

Fibre core

General: Working load limits for slings with fibre core in grade 1770 or 1960 N/mm2  ferrule-secured, P- or PK-ferrules.

Fibre core - 1770 N/mm²

RopeWLL in tons for steel wire rope with fibre core 1770 N/mm²
ØSingle
2-leg & basket*
3- 4-leg*
Endless

16613

16603

16605

16640

16641

16643

16638

16725

16614

16726

mm

Straight

Choked

Basket

0°-45°45°-60°0°-45°45°-60°

Straight

Choked

Basket

30,090,070,180,120,090,190,130,180,140,36
40,150,120,30,210,150,310,220,30,240,6
50,250,20,50,350,250,50,350,50,41
60,350,280,70,50,350,70,50,70,551,4
70,50,410,70,510,7510,82
80,70,551,40,950,71,51,051,41,12,8
90,850,71,71,20,851,81,31,71,43,4
101,050,852,11,51,052,251,62,11,74,2
111,312,61,81,32,71,952,62,125,2
121,551,23,12,121,553,32,33,12,56,2
131,81,43,62,51,83,852,73,62,97,2
142,12

1,7

4,232,124,353,154,243,38,48
162,72,25,43,852,75,654,25,44,3510,8
183,42,76,84,83,47,25,26,85,6513,6
204,353,48,764,3596,58,76,917,4
225,24,110,47,25,2117,810,48,420,8
246,3512,68,86,313,59,412,61025,2
267,25,814,4107,2151114,411,828,8
288,46,716,811,88,41812,516,813,533,6
32118,822151123,516,5221844
361411,228191429212822,556
401713,63423,5173626342868
442116,84229214431,54233,584
48252050352552375040100
522923,258402962445847116
5633,526,8674733,571506754134
6039

31,2

78543981587863156
Factor (KL)10,821,412,11,521,64
* When using a multi-leg sling in a choker hitch - reduce the value with 20%.

Fibre core - 1960 N/mm²

RopeWLL in tons for steel wire rope with fibre core 1960 N/mm²
ØSingle
2-leg & basket*
3- 4-leg*
Endless

16613

16603

16605

16640

16641

16643

16638

16725

16614

16726

mm

Straight

Choked

Basket

0°-45°45°-60°0°-45°45°-60°

Straight

Choked

Basket

30,10,080,20,140,10,210,150,20,180,4
40,180,140,380,250,180,380,270,360,30,72
50,280,220,560,380,280,570,40,560,431,12
60,40,320,80,560,40,840,60,80,641,6
70,550,41,10,750,551,10,831,10,92,2
80,750,61,51,10,751,61,11,41,23
90,90,81,81,260,921,41,81,53,6
101,20,952,41,71,22,51,82,41,94,8
111,41,12,821,432,22,82,35,6
121,71,33,42,41,73,62,63,42,76,8
1321,642,824,2343,28
142,3

1,8

4,63,22,34,83,54,63,79,2
1632,464,236,34,564,812
183,83,17,65,33,885,77,66,115,2
204,73,89,46,64,7107,19,47,618,8
225,74,611,485,7128,511,49,223
246,85,413,69,56,814,310,213,61127
2686,41611,2816,8121612,832
289,37,418,6139,319,51418,61537
32129,72416,81225,5182419,548
3615123021153223302560
4019153827194028,5383076
4423184632234834463792
48272254382757415444108
52322664453267486451128
56373074523778567460148
6043

34

86604390648668172
68554411077551158211088220
71604812084601269012096240
Factor (KL)10,821,412,11,521,64
* When using a multi-leg sling in a choker hitch - reduce the value with 20%.

Steel core

General: Working load limits for slings with steel core in grade 1770 N/mm2 and 1960 N/mm2 ferrule-secured, P- or PK-ferrules.

Steel core - 1770 N/mm²

RopeWLL in tons for wire rope with steel core 1770 N/mm²
ØSingle
2-leg & Basket*
3-4-leg*
Endless

16613

16603

16605

16640

16641

16643

16638

16725

16614

16726

mm 

Straight

Choked

Basket

0°-45°45°-60°0°-45°45°-60°

Straight

Choked

Basket

30,10,080,20,140,10,210,150,20,160,4
40,170,140,340,240,170,360,250,340,270,68
50,270,220,540,380,270,560,410,540,431,08
60,380,30,760,530,380,80,570,760,611,52
70,530,421,060,740,531,10,81,060,852,12
80,750,61,51,050,751,551,11,51,23
90,950,751,91,30,9521,41,91,53,8
101,150,92,31,61,152,41,72,31,854,6
111,41,12,821,432,122,82,255,6
121,71,353,42,31,73,552,53,42,76,8
1321,642,824,15343,158
142,25

1,8

4,53,152,254,83,44,53,79
1632,464,236,34,564,812
183,737,45,23,77,85,657,4614,8
204,63,79,26,54,69,86,99,27,3518,4
225,654,511,37,85,6511,88,411,3922,6
246,75,413,49,46,7141013,410,626,8
267,86,215,6117,816,511,515,612,531,2
2897,21812,591913,51814,536
3211,89,423,616,511,82517,523,61947,2
36151230211531,522,53023,560
4018,514,8372618,53928373074
4422,5184531,522,54733,5453690
482620,852372655405242104
5231,525,2634431,566476350126
563628,872503676547258144
6042

33,6

84584288638467168
Factor (KL)10,821,412,11,521,64
* When using a multi-leg sling in a choker hitch - reduce the value with 20%.

Steel core - 1960 N/mm²

RopeWLL in tons for wire rope with steel core 1960 N/mm²
ØSingle
2-leg & Basket*
3-4-leg*
Endless

16613

16603

16605

16640

16641

16643

16638

16725

16614

16726

mm 

Straight

Choked

Basket

0°-45°45°-60°0°-45°45°-60°

Straight

Choked

Basket

30,110,090,220,150,110,230,160,220,170,44
40,190,150,380,270,190,40,280,380,30,76
50,30,240,60,420,30,630,450,60,51,2
60,430,340,860,60,430,90,650,860,71,7
70,60,51,20,80,61,20,881,20,92,3
80,80,651,61,150,81,71,21,61,33,2
91,050,82,11,451,052,21,82,11,74,2
101,312,61,81,32,71,92,625,2
111,51,232,21,53,32,332,56
121,81,43,62,61,83,92,83,637,2
132,21,84,432,24,53,24,43,58,8
142,5

53,52,55,33,85410
163,32,66,64,63,36,94,96,65,213,2
184,13,38,25,84,18,76,28,26,616,4
205,14,110,27,25,110,77,710,28,220,4
226,2512,48,76,2139,312,41024,8
247,45,914,810,37,415,511,114,811,829,6
268,7717,412,18,718,21317,413,834,8
281082014102115201640
321310,42618,41327,519,7262152
3616,613,3332316,635253326,566
4020,516,4412920,54331413382
44252050352552375040100
4829,523,6594129,562445947118
52352870483573527055140
56403280564084608064160
6046

37 

92654697699274184
Factor (KL)10,821,412,11,521,64
* When using a multi-leg sling in a choker hitch - reduce the value with 20%.

Temperature Affect on Working Load Limit (WLL)

Account should be taken of the maximum temperature that can be reached by the wire rope sling in service. This is difficult in practice but underestimation of the temperature should be avoided.
The table below summarises the necessary de-rated working load limits of a sling due to temperature, taking into account the type of rope termination, the ferrule material and the core of the rope.

When wire rope slings are to be used in temperatures below -40 °C CERTEX should be consulted.

The use of wire rope slings within the permissible temperature ranges given in the table does not require any
permanent reduction in working load limit when the rope is returned to ambient temperature.

Termination

Ferrule-
Rope
De-rated working load limit expressed as % of WLL of the sling
type
material
core
Temperature (t) ºC
-40 - 100101 - 150151 - 200201 - 300301 - 400400<t
FerruleAluminiumFibre100Do not useDo not useDo not useDo not useDo not use
FerruleAluminiumSteel100100Do not useDo not useDo not useDo not use
FerruleSteelFibre100Do not useDo not useDo not useDo not useDo not use
FerruleSteelSteel100100907565Do not use
Splice-Fibre100Do not useDo not useDo not useDo not useDo not use
Splice-Steel100100907565Do not use
Socketzinc/alloyFibre-40 - 80ºC 100%
Socketzinc/alloySteel-40 - 120ºC 100%
Socket2-componentFibre-50 - 80ºC 100%
Socket2-componentSteel-50 - 80ºC 100%

Acidic conditions

Wire rope slings should not be used either immersed in acidic solutions or exposed to acid fumes.

Chemical affect

CERTEX should be consulted in case the slings are to be exposed to chemicals combined with high temperature.

Soft Eye

The peripheral length (l) of a soft eye shall be at least four rope lay lengths. CERTEX Svenska apply as standard that the length (h) of the soft eye shall be at least 15 times the rope diameter.

Wire Rope Fittings

The most commonly used rope fittings with indication of remaining percentage of steel wire min breaking force.
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Pear socket
100 % efficiency

Length

Length
The length (L) shall be that measured between the bearing points of the sling or the circumference length of an endless sling.

Single leg and endless slings

The measured length of a ferrule-secured sling shall not differ from the nominal length by more than two rope diameters or 1 % of the nominal length, whichever is the greater.

The measured length of a spliced sling shall not differ from the nominal length by more than four rope diameters or 2 % of the nominal length, whichever is the greater.

Where single leg slings are intended to be used as matched sets, the difference in length of matched sets of ferrule-secured eye slings shall not exceed the rope diameter, or 0,5 % of the nominal length, whichever is the greater.

Multi leg slings
The measured individual leg length of a ferrule-secured sling shall not differ from the nominal length of the sling by more than two rope diameters or 1 % of the nominal length, whichever is the greater.

The difference in length between the individual legs of any multi-leg sling under no load shall not exceed 1,5 times the rope diameter or 0,5 % of the nominal length, whichever is the greater.

"Laid" (cable-laid) endless slings
The measured length for cable-laid grommets with diameter <61 mm the tolerance shall be ±1d or 1% of the nominal length, whichever is the greater. For cable-laid grommets with diameter >65mm the tolerance shall be ±0,5d or 0,5% of the nominal length, whichever is the greater.

Dimensioning for Steel Wire Rope Slings

Working load limit (WLL) for steel wire rope sling

Single leg sling
WLL (ton) = (Fmin x KT) / (Zp x g)

Endless sling (choke)
WLL (ton) = (Fmin x KT x 2 x 0,8) / (Zp x g)

Multi-leg sling
WLL (ton) = (Fmin x KT x KL) / (Zp x g)


Fmin = the minimum breaking force of the rope, in kN.
KT = factor for the efficiency of the termination, for ferrule 0,9 and for spliced 0,8.
KL = the leg factor relating to the number of legs and the angle to the vertical, see WLL-table.
Zp = the coefficient of utilization (working coefficient), with the value 5.
g = 9,81

Bending diameters effect on the working load limit (WLL)
CERTEX recommend that consideration will be taken to that the slings capacity will be lower when the bending diameter decreasing. If, for example the rope bends around a bearing point witch have the same diameter as the rope itself the capacity will decrease to the half, see figure.

Ferrule/Splicing

The minimum length of plain rope between the inside ends of ferrules terminating a sling leg shall be 20 times the nominal rope diameter. The minimum length of plain rope between the tails of splices shall be at least 15 times the nominal rope diameter. For endless sling the length between the ferrules shall not be less than three times the length of the ferrule after pressing.

Steel Wire Rope Slings

General: Steel wire rope slings are in most cases easier and less expensive than chain slings. Galvanised wire rope provides good protection against corrosion, in extreme environments stainless wire ropes can be used. For extremely heavy lifting wire rope slings are usually the best option.
Material/Design: For manufacturing of wire rope slings the rope grade shall be either 1770 or 1960 N/mm². In multi-leg slings the rope dimension and grade shall be the same for each leg. The working load limit of the lower terminal fitting(s) shall be at least equal to that of the leg(s) to which it is/they are fitted. Where a terminal fitting is used, the eye termination shall always be fitted with a thimble. For 3- and 4-leg slings a master link with intermediate link should bee used.
Safety factor: 5:1.

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6x19-FC / 114-wires
Standard sling

Multi Leg Slings

The working load limit of any master link shall be at least equal to that of the sling. The working load limit of any intermediate link fitted to a three-leg or four-leg sling shall be at least equal to 1,6 times the WLL of one of the legs suspended from it.

WARNING! When using the steel wire rope sling for projected lifting with an angel (ß) less then 45o,the working load limit will increase. This shall be informed by the time of order.

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2-leg sling

Marking

Each sling shall be provided with a marking plate or be marked in the ferrules (single leg and endless slings) with the manufacturer's identifying mark, working load limit (WLL), length, manufacturing date and CE marking.