English to French Tech/Engineering Mechanics / Mech Engineering Cranes

"The sockets are to be installed on the quay by the crane owner, according to the geometry and installation tolerances informed by XXX S.A."

"Retractable pin fixed to the crane at ground level aimed to restrain crane movement against the rails once engaged in purpose made sockets fitted on the quay."

Je sais que "socket" a le sens de prise mais j'imagine qu'il existe un terme en français pour les trous destinés à la fixation de la grue.

D'avance merci !