Screw lock carabiner (screw connectors, chain connectors) are mainly used to absorb tensile forces when connecting ropes, wire ropes or
chains to solid components. They are also regularly used as emergency links (rapid link) for connecting chain links. The
screw lock carabiner makes it easier to replace a damaged stainless steel chain
or a wire rope. The curved shape makes the connection more flexible. Screw lock carabiners are often
a sensible alternative to snap hooks, snap clasps and shackles.
They have proven useful in the following areas:
water sports, boat building, boating, shipping, yacht building, horticulture and landscaping, the food and beverage industry,
water and waste technology, mechanical and systems engineering, conveyor technology,
playground equipment, awnings and canopies.
These screw lock carabiners are not designed and manufactured for lifting purposes,
as part of lifting equipment or load handling devices. For this reason, it is not permitted to use them as lifting equipment, slings,
or load-bearing devices, especially within the scope of the Machinery Directive
2006/42/EC. For the calculation of the operational load
a safety factor of 3 for occasional use has been established in the past. For permanent and
dynamic loads, a safety factor of 4 was calculated. Let us say that the screw lock carabiner is loaded regularly or dynamically and has a
breaking load of 2,000 kg. Under these conditions the operating load is calculated as follows:
Operating load = breaking load/safety feature.
Operating load = 2,000 kg/4.
Operating load = 500 kg.