Omega Pacific 1/2" Large D NFPA KeyLock 3-Stage Quik-Lok. OP12S58KLQ3NFPA. $43.25. Large D shape for great handling, huge gate opening and massive strength. At a rated strength of 72 kN, it's one of the strongest carabiners in the world. Heat treated, half-load tested (over 8,000 lbf.) and built to exacting standards, the 1/2" Large D is the standard in steel carabiners. Made from 1/2" steel barstock with a symetrical D shape that is engineered for superior strength. Zinc chromate plated to increase corrosion resistance. Made in the U.S.A.

UL Classified G for General Use
Exceeds NFPA 1983.01 strength standards
Meets NFPA 1983.01 manufacturing standards
Certified to the ANSI Z 359.1 standard for Industrial Safety Use

Weight: 11.4 oz (125 g)
Breaking Strengths:
Major Axis: 72 kN
Minor Axis: 28 kN
Gate Open: 28 kN
Gate Opening: .866" (22 mm)