These compact single-acting cylinders with built-in spring are ideal for clamping pieces on multiple fixtures of machine tools. The fluid is supplied through passages inside the machine tool assembly, thus eliminating pipelines and unions; sealing is ensured by copper washers for the version with threaded body and by O-rings for the version with base. The body is constructed in heat-treated steel for automatic machines and the piston in case hardened steel ensures long cylinder lifetime. Available in two versions: with crowned (version A) or threaded piston end (version B).