Working Load Limit

Besides bending as a dynamic factor, bending as a static factor will also have an effect on breaking
strength of the rope. It has been determined in a series of test that the Eb formula as presented in
PM20 also applies for Aruna® grommets. It is strongly recommended not to use Aruna® grommets
on D/d < 2:1.

Working load level is directly related with used pin diameter

Working Load Limit ARUNA-Sling at various D/d (pin dia versus grommet dia)

Article Grommet MBL Working Load Limit (WLL) Factor of safety

No Ø mm m.t. D/d
5 : 1 D/d
4.5 : 1 D/d
4 : 1 D/d
3.5 : 1 D/d
3 : 1 D/d
2.5 : 1 D/d
2 : 1

ARS030 30 65 13.50 9.93 9.75 9.53 9.24 8.89 8.40

ARS060 60 270 54.00 41.26 40.50 39.58 38.39 36.94 34.88

ARS090 90 705 141.00 107.72 105.75 103.35 100.25 96.44 91.09

ARS120 120 1030 206.00 157.38 154.50 151.00 146.47 140.90 133.08

ARS150 150 1740 348.00 265.87 261.00 255.08 247.43 238.03 224.81

ARS180 180 2595 519.00 396.52 389.25 380.43 369.01 355.00 335.27

ARS210 210 3135 627.00 479.03 470.25 459.59 445.80 428.87 405.04

ARS240 240 4000 800.00 611.20 600.00 586.40 568.80 547.20 516.80

Calculation of MBL grommet : 12 x MBL(single) * 90 %

Article	Grommet	MBL	Working Load Limit (WLL) Factor of safety
No	Ø mm	m.t.	D/d 5 : 1	D/d 4.5 : 1	D/d 4 : 1	D/d 3.5 : 1	D/d 3 : 1	D/d 2.5 : 1	D/d 2 : 1
ARS030	30	65	13.50	9.93	9.75	9.53	9.24	8.89	8.40
ARS060	60	270	54.00	41.26	40.50	39.58	38.39	36.94	34.88
ARS090	90	705	141.00	107.72	105.75	103.35	100.25	96.44	91.09
ARS120	120	1030	206.00	157.38	154.50	151.00	146.47	140.90	133.08
ARS150	150	1740	348.00	265.87	261.00	255.08	247.43	238.03	224.81
ARS180	180	2595	519.00	396.52	389.25	380.43	369.01	355.00	335.27
ARS210	210	3135	627.00	479.03	470.25	459.59	445.80	428.87	405.04
ARS240	240	4000	800.00	611.20	600.00	586.40	568.80	547.20	516.80