Columbus McKinnon M666A-P 1-3/8" Alloy Steel Screw Pin Anchor Shackle 21 Ton WLL

The Columbus McKinnon M666A-P is a heavy-duty 1-3/8 inch alloy steel screw pin anchor shackle designed for demanding lifting and rigging applications. This professional-grade shackle features a 21-ton working load limit and is manufactured with a 5:1 design factor, providing superior strength that is approximately 50% higher than comparable carbon steel shackles and about 25% stronger than super strong shackles.

Key Features:

• Forged alloy steel construction with quenched and tempered alloy pin for maximum durability
• 21-ton working load limit (42,000 lbs capacity)
• 5:1 design factor for enhanced safety margins
• Screw pin design allows for quick attachment and removal
• Anchor (bow) style allows for side loading and multiple connections
• Made in USA from domestic Special Bar Quality (SBQ) steel
• Meets Federal Specification RR-C-271 and ASME B30.26 requirements
• Permanent markings show working load limit and traceability codes
• Available in powder coated orange, galvanized, or self-colored finishes

Columbus McKinnon alloy anchor shackles are manufactured at their Tennessee facilities using state-of-the-art forging processes. The micro-alloy steel construction provides optimal hardness for both strength and ductility, making this shackle ideal for industrial lifting, construction, rigging, material handling, and heavy equipment applications where reliability is critical.