SMC’s Large Steel Locking D and ANSI Safety Lock were developed especially for the needs of the Industrial Work and Rescue communities with a large gate opening that easily fits over litter rails. The 21001 is a non-NFPA version which is not stamped with the UL Certification but is otherwise identical to the NFPA21001. The 21001 sleeve locks on the gate rather than the body of the carabiner, eliminating problems of the knob binding on the frame after the carabiner has been loaded. The 21501 ANSI Safety Lock is a triple stage auto-locking version of the 21001 featuring an ANSI Z359.1 compliant gate break strength of 16kN to meet all your OSHA compliance issues. Both the 21001 and 21501 features stainless steel gates for greater strength and reliability. All the components in these carabiners are meticulously hand finished after machining resulting in the smooth, free gate action that is the hallmark of all SMC carabiners. Additionally, each carabiner is 100% hand inspected for gate action and other functional characteristics before leaving our factory. If you want a carabiner that performs just as well after 1,000 jobs as it did the first time you used it then you need to buy SMC.
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