Numerical values published for Breaking Strength and Working Load Limit 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.
- Ail 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 80 alloy components.”