Grade 100 Chain Slings

Grade 100 Chain Slings Buying Guide

What the extra 25% actually buys. Grade 100 is alloy steel taken through a tighter heat treatment than Grade 80, and the payoff is roughly 25% more working load limit at the same chain diameter. At 3/8 inch, standard Grade 80 chain rates 7,100 lb; the 3/8 inch William Hackett single leg in this collection carries 8,800 lb. That margin matters most when a required rating falls in the gap between sizes. A 14,000 lb pick forces Grade 80 up to 5/8 inch chain, while the 1/2 inch Grade 100 single here covers it at 15,000 lb, and the rigger carries the lighter sling all shift. The advantage compounds on multi-leg assemblies, where four legs of oversized chain weigh enough that nobody hauls them up a ladder for fun. High-cycle shops standardize on Grade 100 for exactly this reason: fewer sizes stocked, less weight moved, the same lifts covered.

Singles, doubles, and 4-legs, sized off the tag. The William Hackett assemblies run in three configurations. Single legs go from 2,700 lb on 1/4 inch chain up to 59,600 lb on 1 inch, for loads that hang plumb from one pick point. Double legs cover 3,800 lb through 84,200 lb for loads with two lift points that need to ride level. The 4-leg slings handle rigid frames, fabrications, and machinery with four corners, topping out at 191,700 lb on 1-1/4 inch chain. Each assembly arrives with master link, legs, and hooks matched, proof tested, and tagged as one unit, in working lengths from 3 to 30 ft on the standard sizes. Two options deserve a real decision: self-locking hooks in place of the standard latch hook, and grab hooks on the legs, which let a rigger shorten a leg in the field to level an off-center load instead of ordering a custom reach for every job.

Check the 45 degree math on the 1/2 inch line. The multi-leg ratings assume legs at 45 degrees from horizontal, and the tags prove it. The 1/2 inch single carries 15,000 lb; the double is 21,200 lb, two legs at 45 degrees rather than 30,000; the 4-leg is 31,800 lb, which is three legs at that angle, because a rigid load never shares evenly across four legs, three carry while the fourth balances. Rig steeper than 45 degrees and each leg sees less tension than the rating assumed, margin in your favor. Rig flatter and tension climbs fast: at 30 degrees each leg carries double its share of the load, and published capacity charts stop there. The practical rule costs nothing. When headroom allows, order the longer working length, because long legs stand steep, and the printed rating stays honest without anyone doing trigonometry over a suspended load.

Dual-rated components and legs built from bulk chain. For rigs built or repaired in-house, the CM side of the collection supplies the parts. Herc-Alloy 1000 Grade 100 chain sells by the foot from $4.74, in sizes from 7/32 to 3/4 inch. The fittings are dual rated for CM's HA800 and HA1000 chain systems, which settles the classic mismatch problem: hang a Grade 80 hook on Grade 100 chain and the whole leg rates at the Grade 80 number, but a dual-rated fitting carries the Grade 100 rating when it rides on Grade 100 chain, and the same part stocks for both fleets. Master links start at $51, Clevlok sling hooks at $67, eye sling hooks with latch run from $55 up to a 72,300 lb rating, and the Grade 100 Latchlok swivel hooks, rated to 22,600 lb, take the twist out of a leg as the hook seats. Assembly is qualified-person work under ASME B30.9, proof tested before the first lift.

The rules that come with the grade. Overhead lifting chain must be alloy steel under OSHA 1910.184 and ASME B30.9, and Grade 100 qualifies everywhere Grade 80 does, with the same duty list afterward. Full working load limit holds to 400 F, per OSHA's alloy chain sling guidance, with published reductions above that, which is why loads out of heat treat ride on chain instead of synthetics. Inspection is a visual check each day the sling is used plus a documented periodic inspection at least every 12 months, tightening to monthly or quarterly in severe service. The tag is a pass-fail item: size, grade, reach, and rating must be legible or the sling comes out of service, and on a mixed Grade 80 and Grade 100 fleet the grade stamp on that tag is what keeps the wrong sling off the wrong lift. A $519 Vestil sling rack keeps the fleet hung, sorted, and off the floor between inspections.