Airtac SILF Front Locking Air Cylinder SILF50X800S

Built for long travel, the SILF50X800S is a double-acting end-lock ISO 15552 cylinder with a 50 mm bore, a Ø20 mm rod and an 800 mm stroke. The SILF/SILB series is discontinued, and this code is supplied as its current replacement SAILF50X800S with the same code after the prefix; every specification below describes that replacement unit. The bore pushes 982 N and pulls 825 N at 0.5 MPa, rising to 1374 N push and 1155 N pull at 0.7 MPa, and those figures are unchanged anywhere along the 800 mm travel because output depends on bore and pressure only.

The F in the code places the mechanical lock in the front (rod-end) cover: with the lock-side port exhausted the piston is held there, so the rod stays put over the full 800 mm stroke if air is lost. Air on that port releases the lock automatically, and a hand lever does it manually; the catalog states no holding-force figure for the lock. The S option adds a built-in magnet that drives position sensors across the entire travel, and adjustable air cushions tame the mass at each end. The cylinder runs on air filtered by a 40 um element at 0.15 to 1.0 MPa (proof 1.5 MPa), from -20 to +70 C, at 30 to 800 mm/s, with 1/4 inch PT ports and an M16x1.5 rod thread.

Travel is the decision here: order the 800 mm code only when the machine moves exactly that far, because stretching the stroke adds length, weight and air per cycle but not force - the push at 0.5 MPa stays 982 N just as on a short SILF50X80S. Mounting is basic, meaning the body carries its own mounting holes for rigid straight-line fixing; if the load swings in an arc, order the same code with CA single clevis or TC center trunnion instead. Within this bore the lock comes in the front cover (F); the SILB rear-lock equivalent suits machines that must hold the piston at the back cover. Keep the S magnet only if you need sensing, and choose the G port code for G (BSPP) threads rather than the PT standard.