Chain slings

General: Chain slings are used when wear resistance and durability is required. A chain sling is flexible. It is possible to shorten, it has many components to choose from, it can withstand high temperatures, and is easy to store.
Material/Design: For manufacturing of chain slings, short link chain grade 8, 10 or 12 shall be used. In multi-leg slings the rope dimension and grade shall be the same for each leg. The working load limit for assembled forging shall be at least the same as working load limit for the current chain. Master link with intermidiate link should always be used to 3- and 4-leg slings.
Working temperature: See "Use and maintenance".
Safety factor: 4:1.

 

 

Working Load Limit (WLL) - Grade 12

General: Tables specify the maximum load for common chain dimensions in grade 12 for use in slings.
WLL in ton for chain grade 12
Single
2-leg & Basket*
3-4-leg*
Endless

31470

 31469

31474

16640

16641

16643

16638

16614

Straight

Choked

Basket0°-45°45°-60°0°-45°45°-60°

Choked

2,361,94,723,352,3653,553,75
32,3664,2536,34,54,75
54107,1510,67,58
86,31611,281711,812,5
10,821,412,11,51,6
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Working Load Limit (WLL) - Grade 10

General: Tables specify the maximum load for common chain dimensions in grade 10 for use in slings.

 

ChainWLL in ton for chain grade 10
ØSingle
2-leg & Basket*
3-4-leg*
Endless

16613

16603

16605

16640

16641

16643

16638

16614

mm 

Straight

Choked

Basket0°-45°45°-60°0°-45°45°-60°

Choked

61,41,122,821,432,122,24
71,91,53,82,651,942,83
82,5253,552,55,33,754
1043,1585,64866,3
136,75,313,49,56,7141010,6
1610820141021,21516
191411,22820143021,222,4
2219153826,519402830
2626,521,25337,126,555,639,742,4
Factor (KL)10,821,412,11,51,6
*When multi-leg chain slings are used in choke hitch - reduce value by 20%

Working Load Limit (WLL) - Grade 8

General: Tables specify the maximum load for common chain dimensions in grade 8 for use in slings.

ChainWLL in ton for chain grade 8
ØSingle
2-leg & Basket*
3-4-leg*
Endless

31470

 31469

31474

16640

16641

16643

16638

16614

mm 

Straight

Choked

Basket0°-45°45°-60°0°-45°45°-60°

Choked

40,50,410,710,51,060,750,8
50,80,61,61,120,81,61,181,25
61,120,92,241,61,122,361,71,8
71,51,232,121,53,152,242,5
821,642,824,2533,15
103,152,56,34,253,156,74,755
135,34,210,67,55,311,288,5
1686,41611,281711,812,5
1810820141021,21516
1911,2922,41611,223,61718
2012,510251712,526,51920
2215123021,21531,522,423,6
231612,83223,61635,52526,5
252016402820403031,5
2621,21742,43021,24531,533,5
2825205033,5255037,540
3231,525,2634531,56747,550
364032805640856063
40504010071501067580
456350
906313295100
Factor (KL)10,821,412,11,51,6
*When multi-leg chain slings are used in choke hitch - reduce value by 20%

Safe Use

Length

Tolerance of length
The length (L) should be measured between the "bearing points" or the circumference for endless slings.

The length on each leg should be nominal length with a tolerance of -0/+2 chain link lengths.

The difference in length (usally the same for all legs) between the shortest and longest leg in a mulit-leg sling, assembled with connecting links, should not exceed 10 mm if the sling is 2 m or less, for longer slings a value of 5 mm per metre should be used.

Marking

Slings are provided with a marking plate with the manufacturer's identifying mark, working load limit (WLL), length, date of manufacture and CE-marking. 

Dimensioning of Chain Slings

Calculation of working load limit (WLL) for chain slings
When the exact information about weight, lifting angle and  position of the centre of gravity is known, you are able  to calculate the working load limit using the trigonometric method as follows:

2-leg sling
WLL (ton) = 2 x WLL for single leg sling x cos ß.

3-4-leg sling
WLL (ton) = 3 x WLL for single leg sling x cos ß.

Note: If the load is unform on all 4 legs in a sling the following formula can be used in exceptional cases:

WLL (ton) = 4 x WLL for single leg sling x cos ß.

ß = the legs angle against the vertical surface.

Sharp edges
Edge protectors should be used to prevent sharp edges from damaging the lifting equipment. As a general rule the radius (R) of the edge should be > 2x the chain diameter. When lifting with chain directly on lugs it is recommended that lug diameter greater than  3x the pitch of the chain should be used. If a lug diameter is less than this, the WLL must be reduced by 50%.

Edge RR > 2x chain ØR > than chain ØR = chain Ø 
Load factor10,70,5

Multi Leg Slings

The working load limit of any master link should be at least equal to that of the sling. The working load limit of any intermediate link fitted to a 3-leg or 4-leg sling should be at least equal to 1,6 times the WLL of the current chain.

WARNING! If the sling is to be used in an anticipated lift with a lifting angle less then (ß) 45° and with a higher working load limit than usual, it should be specified at time of order.

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2-leg sling