Information from APCO Aviation:
"Our carabiners have very precise tolerance between the gate and the catch, preventing periodical bending cycles under repeated loads. So no loss of strength is recorded after prolonged use. The carabiner is made from aircraft quality 7075 Aluminium Alloy Hot Forged and individually tested. This is a manufacturing technique guaranteeing the best strength results (as the material is free of internal stress). The carabiners from most other manufacturers are made by bending aluminium rod which introduces internal tension and invisible micro cracks significantly reducing the strength of the carabiner during its lifespan, accelerated by the periodical bending cycles under repeated load due to the big tolerance between the gate and the body catch.

To reconfirm our data, we asked the Israel Institute of Standards to test the breaking strength of carabiner both before and after repeated bending cycle. Test results received from them, showing carabiner before bending carries 2.5 ton and after prolonged use is still good for at least 1,700-1,800 kg."

Key features Air Extreme Gate Lock Carabiner