1. n. [Well Completions]

A generic term used to describe equipment attached to, and run with, the casing string. Commonly used casing hardware includes guide or float shoes, float or landing collars, centralizers, scratchers, and cement baskets. More specialized casing hardware may include stage-cementing collars, differential fill-up equipment, and other specialized equipment to help achieve successful placement and cementation of the casing string.

See: centralizer,  float collar,  float shoe,  landing collar,  scratcher