Wire Rope Slings — Inspection and Removal Criteria

Wire rope slings are the workhorse of the yard, and they fail from the inside out. A rope that looks fine can be hiding broken wires, crushing, or heat damage that dropped its strength well below the rating. That's why OSHA 1926.251(c) wants them inspected before use on each shift and pulled the moment they hit a removal criterion.

You're looking and feeling for damage along the whole length and especially at the end fittings, where most breaks start. Run a rag along it — snags catch broken wires you'd miss by eye.

Broken-wire removal limits

The clearest retirement rule is broken wires. For a wire rope sling, take it out of service when you find:

Ten randomly distributed broken wires in one rope lay, or
Five broken wires in one strand in one rope lay.

A rope lay is one full wrap of a strand around the rope. Broken wires cluster where the rope bends over the hook and at the swaged or spliced end fittings — check those areas closely, because a break at the end connection is an automatic removal.

Other damage that retires a sling

Broken wires aren't the only killers. Pull the sling if you find:

Kinking, crushing, birdcaging, or any distortion of the rope structure.
Evidence of heat damage — from a torch, an arc, or a fire.
End attachments that are cracked, deformed, or worn.
Hooks opened more than 15 percent of the normal throat, or twisted more than 10 degrees.
Severe corrosion of the rope, end fittings, or clips.
Wear that has worn away a third of the original diameter of the outside individual wires.

Any one of these is enough. You don't average defects or hope it holds — a retired sling is retired.

End connections and clips

How the eye is made matters as much as the rope. A swaged or spliced eye should be clean and undamaged; an eye splice must have at least three full tucks. When wire rope clips form the connection, they have to be the right number, sized to the rope, and spaced per the maker — and the saddle goes on the live (load) side with the U-bolt on the dead end. The old line is 'never saddle a dead horse.'

Protect the rope in service: pad sharp corners, don't drag slings out from under loads, and don't shorten a wire rope sling with knots or bolts. When a sling reaches any removal criterion, cut the eye or tag it so it can't be picked back up by mistake.

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