Omega's extra large Steel Ladder Hook Carabiner is designed to fit over ladder rungs, pipes, safety rails, building apparatus, or anywhere you may need the huge gate clearance of this exceptionally strong carabiner. The gate clearance of the Ladder Hook is enhanced by the unique side-swing gate mechanism, which enables the gate to open beyond the carabiner spine to provide a massive gate opening, even for a carabiner of this size. Large, lightweight, and durable, Omega's Steel Ladder Hook Carabiner meets NFPA 1983.01 construction standards, exceeds NFPA 1983.01 and ANSI/OSHA strength standards, and has a UL Classification of G.
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Rick we sent our vendor your question, and this was their response back;
OPLH8L is self-closing, but requires the user to manually screw the locking sleeve upward to lock the carabiner. Instead, please look at OPLH8Q ... same frame, but it has our Quik-Lok gate which means it is both self-closing and self-locking. To open OPLH8Q, one must rotate the sleeve approximately one-quarter turn prior to opening the gate. This is a single-handed operation for most users.
Both SKUs are G-Rated to the NFPA standard. Neither are certified to the ANSI standards referenced, the significant difference in ANSI being an additional series of tests on the closed gate of the finished carabiner. :
This is the response i got back from Omega Pacific; Hope it helps you,
The kN, or kilonewton, rating measures the amount of force the carabiner can accept, as opposed to how much mass it can hold in a static situation. Objects with relatively low mass (like a person) can generate substantial energy (force) when accelerating, so it can be misleading if a piece of climbing or fall-arrest equipment were rated in terms of "pounds" or "kilo grams." In order to convert kilonewtons into pounds-of-force (another measure of force, not mass), simply multiply the rating in kN by 224.8 (1kN = 224.8 lbf). All Omega Pacific carabiners are stamped with the major axis strength measured in kilonewtons.
In your case, the Ladder Hook unit is rated to 41 kilonewtons.
41 kn x 224.8 lbf = 9,216.8 lbf