Kulkoni, Inc. 1-800-231-2357

Kulkoni, Inc. v921 WARNING: NEVER EXCEED WORKING LOAD LIMIT Page 4 FURTHER EXPLANATIONS AND CAUTIONS IF LIFTING ANGLES ARE INVOLVED Numerical values published for Breaking Strength and Working Load Limit in the catalog are very specific in one point: They refer to straight, in-line pull or force and are obtained under laboratory conditions. There are, however, many applications where a straight line pull is not possible or even desirable. When a tackle block system is reeved, wire rope may be bent over many sheaves; multiple leg wire rope or chain slings involve differing lifting angles; angular loads on shackles or eyebolts alter Working Load Limits of the equipment used. All these and other factors influencing the Working Load Limit must be taken into account when systems are designed and used. The following examples and tables are intended to highlight and demonstrate the effects of angles on the Working Load Limit. CHAIN SLINGS, Fabricated entirely from grade 100 alloy components. WORKING LOAD LIMITS The rated capacity of a multiple leg sling is directly affected by the angle of the sling leg with the load. As this angle decreases, the stress on each leg increases with the same load. If the sling angle is known, the capacity can be readily determined by mul- tiplying the sling's vertical capacity by the appropriate load angle factor from the table at right. Sling Angle Load Angle Factor Example: A multiple leg sling with a rated capacity of 2000 lb. will have a re- duced capacity of 1000 lb. (2000 x .500) when sling legs are at an angle of 30° with the load. 90° (vertical) 1.000 75° 0.966 60° 0.866 45° 0.707 30° 0.500 EFFECT OF ANGLES ON SLING CAPACITIES WORKING LOAD LIMITS - POUNDS Chain Size in Inches 90 ° 30 ° 45 ° 60 ° 30 ° 45 ° 60 ° 9/32 4,300 4,300 6,100 7,400 6,400 9,100 11,200 5/16 5,700 5,700 8,100 9,900 8,500 12,100 14,800 3/8 8,800 8,800 12,400 15,200 13,200 18,700 22,900 1/2 15,000 15,000 21,200 26,000 22,500 31,800 39,000 5/8 22,600 22,600 32,000 39,100 33,900 47,900 58,700 3/4 35,300 35,300 49,900 61,100 53,000 74,900 91,700