Rigging Hardware

Rigging hardware is used to make the connection between hook and load.

They are one in the same. These are generic terms. Specific names include: Shackles, clevis, hoist rings, swivel eyes, eye hooks master links, oblong links.

Selecting the proper rigging hardware is a process of evaluation that must be performed by a qualified.

• Capacity, also referred to as load rating, is a good starting point. Considering the total weight of the load, number of slings used, Agular tension and share of load are key factors to evaluating the capacity on any one single leg or multiple leg configuration.
• Second and equally important is spatial relation. Consideration must be given to the integrating connections where the hardware makes contact with the sling. Factors that must be evaluated: 1) diameter of the connection 2) Connection width 3) bearing stress as a function of the width and diameter.
• Condition of the rigging hardware is also a very important factor, especially when rigging with synthetic. Synthetic friendly connection are smooth and free from forging flash marks created during the forging process.

OSHA 1910.184 governs lifting and rigging. Considering OSHA being a government agency that has not updated their standards for many years, if not decades they refer and defer to the highest incorporation of reference. In many case ASME B30.9 as they actively write standards such as ASME B30.20 covering rigging hardware, AMSE B30.10 specially governing hooks.

Working load limit originates from standards such as ASME B30.9 and WSTDA. This terms is used to identify the maximum load value that can be applied to the rigging. Whether a web sling, Roundsling, rope sling, shackle, hook or master link each has a Working load limit that shall NOT be exceeded under any circumstance.

• Initial level - when you purchase and receive
• Frequent level - before each shift or day as defined by ASME B.30 under “normal service” conditions. Before each use when defined as “Severe or critical” by the qualified person
• Periodical level - never to exceed one year

Written records that the inspection was performed are required for all rigging hardware and related equipment performed annually.

Material composition depends on application of use. We find that many times that forged alloy materials in grade 80 and 100 (class 8 and 10) put through a quenched a temper process result in very long lasting and durable shackle, hook and master link. Many of these forged parts are then treated with Cadmium plating, powder coating and or galvanizing to further increase longevity, especially when used offshore or in corrosive environments.

ASME B30.20 requires name or trademark of manufacture to be ASME compliant, knowing what company built the part is very important. Some of the hardware will have the Working load limits stamped or embossed while others only require the size to be marked. Identifying the manufacture and size of the part will then lead you to published specifications and working limits and intended application of use.

No. ASME B30 has specific requirements for the differing type of rigging hardware. Always be cognizant of the manufactures ratings whether working load limit, break strength, US imperial pounds, US Ton, Metric ton, Kilograms, Newton meter etc. to ensure you understand and identify the working load limit.