Hexcentric

Hexcentrics are items of rock climbing equipment used to protect climbers from injury during a fall. Hexcentrics, usually called "hexes", are a type of nut, a hollow eccentric hexagonal prism with tapered ends, usually threaded with webbing, a swaged cable, or a cord. They are manufactured by several firms, with a range of sizes varying from about 10 mm thick to 100 mm wide. Sides may be straight or curved although the functioning principles remain the same no matter which shape is selected; the lack of sharp corners on curved models may make them easier to remove from the rock.

Hexcentrics may be placed either as passive or active protection and are frequently carried by alpine mountaineers in place of spring loaded camming devices because of their lack of moving parts and overall lower weight for the same size crack. The hexcentric is placed actively by orienting the webbing so that a pull causes a camming action against the rock.