Choose a Clevis Shackle by Load, Pin Security and Fit

A clevis shackle is a removable, pin-closed connector used to join items such as slings, chain and lifting points. For jobsite lifting, choose it by the force at the connection, loading direction, pin security and actual fit—not simply by diameter or a seller’s “heavy-duty” label.

Treat “clevis shackle” as a starting search term, not a complete specification. Establish whether the exact product is intended for overhead lifting, then verify its marked working load limit (WLL) and manufacturer’s instructions. A towing or hitch connector is not automatically suitable for suspending construction materials.

For U.S. construction work, OSHA 1926.251 requires legible manufacturer-prescribed load markings, prohibits exceeding the marked capacity and requires rigging inspection before use on each shift and as necessary during use.

Choose the body shape and pin separately

The body shape controls connection space and loading geometry. The pin arrangement controls how the connection stays closed.

Feature	Where it generally fits	Main check
D or chain shackle	A single, straight-line connection	Do not assume it can gather multiple sling legs or take side loading
Bow or anchor shackle	Connections needing more room, including approved multi-leg arrangements	More room does not mean unrestricted load angles
Screw pin	Short-duration work with frequent assembly and removal	The pin must seat fully and must not be turned loose by the rigging
Bolt, nut and cotter pin	Long-term connections or applications where pin rotation or vibration is a concern	Install both the nut and the specified cotter pin

These are selection categories, not interchangeable ratings. For example, Green Pin identifies its G-4151 dee shackle as suitable for one-leg lifting systems only, while its G-4163 bow shackle permits one-leg and multi-leg systems. Crosby’s application matrix likewise distinguishes screw-pin models from bolt-type models for long-term installation and secondary pin retention.

Do not confuse a round pin retained only by a cotter with a bolt-nut-cotter assembly. Their retention mechanisms differ; check the exact model’s permitted service rather than choosing from appearance.

Read WLL—not breaking strength

WLL is the permitted working load under the manufacturer’s stated conditions. Minimum breaking load and proof-test load are different values, not extra usable capacity.

For example, Green Pin lists minimum breaking load as six times WLL for its G-4151 and G-4163 shackles. That ratio is not permission to exceed WLL. It is part of the product’s design specification. Green Pin product details

Before selecting capacity:

• Establish the load and force at that particular connection; do not assume every shackle carries an equal share.
• Check sling angles and the complete rigging arrangement.
• Apply any manufacturer-required reductions for loading direction or operating conditions.
• Check the remaining components and lifting equipment. A higher-rated shackle does not upgrade a sling, lifting lug, attachment or machine.

Columbus McKinnon’s shackle guidance directs users to base the rigging plan on the lowest-rated component and to reduce rated load for permitted side loading according to the applicable guidance. It also warns against shock loading: apply the load gradually, without sudden jerking.

Side loading is not the same as a properly arranged two-leg connection. A pull away from the intended shackle centerline changes how the body and pin carry stress. If the shackle cannot align with the pull, stop and check its application instructions. Do not borrow a side-load reduction chart from another model or manufacturer.

Check pin diameter, opening and bearing surface

Nominal shackle size does not necessarily equal pin diameter. Compare the manufacturer’s drawing with the actual lifting lug, sling eye, thimble or chain connection.

For example, Green Pin’s GPGDBB13 dee shackle lists a 13.5 mm body diameter, 16 mm pin diameter and 22 mm inside width. Selecting it from body diameter alone could leave you with a pin that will not enter the lug. G-4151 dimensional table

Check that:

• The pin fits the intended hole and the connection fits between the ears.
• The sling or fitting seats without crowding, twisting or forced alignment.
• There is access to fully install and inspect the pin and retainers.
• The bearing surface meets the sling manufacturer’s requirements.

Use the correct manufacturer-supplied pin. Do not replace it with a hardware-store bolt or a pin taken from another shackle. For screw-pin shackles, seat the shoulder against the body; do not deliberately back it off to make later removal easier. Columbus McKinnon’s pin guidance

Inspect before loading

Remove questionable shackles from service rather than straightening, welding or grinding them into apparent usability. Look for illegible markings, mismatched body and pin, damaged threads, incomplete engagement, missing retainers, distortion, cracks, gouges, corrosion and heat damage. Manufacturer inspection and removal guidance

Green Pin specifies a maximum allowable wear of 10% of the original dimension for the shackles covered by its inspection guidance, alongside other rejection criteria. That is not a universal allowance for every product, and cracking or deformation can require removal well before that wear limit. Green Pin inspection guidance

For an order or rigging-kit list, record the manufacturer and model, WLL and units, body shape, pin type, pin diameter, inside opening and intended loading arrangement. Those details make the connector identifiable—and prevent a same-size but unsuitable substitute from reaching the lift.