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CM Screw Pin Anchor CM Shackles are made from technically advanced micro-alloy steel to provide the greatest possible strength. A quick assessment of working load limits is marked on both the shackle and the screw pin.
Working Load Limit of .75-35 tons.


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CM Screw Pin Anchor CM Shackles

CM Screw Pin Anchor Shackles are made from the best possible materials. This gives them a strength rating approximately 50% higher than a comparable-sized carbon shackle. CM Screw Pin Anchor Shackles meet dimensional and performance requirements of RR-C-271. CM Smart ID RFID technology is available as an option on screw pin anchor shackles sizes 1/2″ to 1-3/4″

CM Screw Pin Anchor Shackles are specifically designed for use on projects where the shackle is needed to be frequently removed. It is recommended for over head lifting, and should be moused in some applications. See Use and care for further details.

A shackle, also known as a gyve, is a U-shaped piece of metal secured with a clevis pin or bolt across the opening, or a hinged metal loop secured with a quick-release locking pin mechanism. Shackles are the primary connecting link in all manner of rigging systems, from boats and ships to industrial crane rigging, as they allow different rigging subsets to be connected or disconnected quickly.

The pin is threaded and one leg of the shackle is tapped. The pin may be captive, which means it is mated to the shackle, usually with a wire. The threads may gall if over tightened or have been corroding in salty air, so a liberal coating of lanolin or a heavy grease is not out of place on any and all threads. A shackle key or metal marlin spike are useful tools for loosening a tight nut.

For safety, it is common to mouse a threaded shackle to keep the pin from coming loose. This is done by looping mousing wire or a nylon zip tie through the hole in the pin and around the shackle body. For pins that have a cross-hole in the threaded end a cotter pin can be used. One disadvantage of wire is that mousing can introduce galvanic corrosion because of material differences; it is especially bad when used in places where the shackle is exposed to air and water. Nylon is not recommended for use where significant movement of the shackle is expected.

For more information on CM Shackles (Screw Pin Anchor Shackles) please visit: https://www.cmworks.com/Rigging/Shackles

Also, be sure to check out some of our other lifting products and services like our swiveling eye bolt products and proofload services.

Additional Information

Also available in:
Weight N/A

2 in., 1 3/4 in., 1 1/2 in., 1 3/8 in., 1 1/4 in., 1 1/8 in., 1 in., 7/8 in., 3/4 in., 5/8 in., 1/2 in., 7/16 in., 3/8 in., 5/16 in., 1/4 in.

CM Shackle Use & Care:
  • CM shackles show major deformation before failure.
  • Mousing (screw pin shackle) is a secondary securement method used to secure screw pin from rotation or loosening. Annealed iron wire is looped through a hole in the collar of the pin and around the adjacent leg of shackle body with wire ends securely twisted together
  • Always inspect every shackle before each load to ensure the safety of the project .
Features and Benefits of CM Shackle:
  • All shackle bodies and pins are forged from alloy steel, heat treated and tempered
  • All shackles are marked with size (inches and millimeters) and working load limit in tons
  • Maximum strength equals five times working load limit


For over 70 years, Tway Lifting Products has partnered with Columbus McKinnon to offer the finest hoists and level tools available anywhere. Columbus McKinnon is known for manufacturing high-quality hoist products that provide the best possible user experience. This level of quality aligns with what we work towards every day here at Tway.

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