Airtac SILF Front Locking Air Cylinder SILF40X125S
Genuine AirTAC ø40 mm end-lock iso 15552 cylinder, order code SILF40X125S from the SIL40 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- Stroke125 mm
- MountingBasic (no mounting)
- VersionFront lock (F) · S · PT
- Bore sizeØ40 mm
- Stock strokes25 – 1000 mm
- Catalog standard strokeup to 1200 mm (longer on request)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SILF Front Locking Air Cylinder SILF40X125S
Order code SILF40X125S adds the S option to the 125 mm end-lock cylinder: a magnet built into the piston, so external reed or Hall-effect switches can report rod position along the 125 mm travel. Because the SILF/SILB series is discontinued, this exact code ships as SAILF40X125S - same code, new prefix - and the figures here describe the SAILF40X125S unit you receive.
Like every SIL40 code it is double acting with a lock in the front (rod-end) cover, released automatically by air on the lock-side port or by hand lever. The basic version mounts through the cylinder's own holes with no foot or flange hardware, uses 1/4" PT ports and an M12x1.25 thread on the 16 mm rod, and its adjustable air cushions suit speeds from 30 to 800 mm/s.
Airtac SILF Front Locking Air Cylinder SILF40X125S Technical Specifications
| Order code | SILF40X125S |
|---|---|
| Product | Ø40 mm end-lock ISO 15552 cylinder |
| Stroke | 125 mm |
| Mounting | Basic (no mounting) |
| Version | Front lock (F) · S · PT |
| Bore size | Ø40 mm |
|---|---|
| Stock strokes | 25 – 1000 mm |
| Catalog standard stroke | up to 1200 mm (longer on request) |
| Acting type | Double acting, with end lock |
| Lock position | Front cover (F) |
| Lock release | Automatic (air on the lock-side port) or manual lever |
| Port size | 1/4" (PT standard) |
| Piston rod / rod thread | Ø16 mm / M12×1.25 |
| Fluid | Air (filtered by 40 µm element) |
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable air cushions |
Source: AirTAC Products Catalog 2026A (PDF01-P0376/P0377), SAIL specifications and ordering code; body as SAI. The SILF/SILB series is discontinued; these are the SAILF/SAILB specifications.
How to choose
The S magnet is the deciding feature here: choose SILF40X125S when a PLC needs end-of-stroke or mid-stroke confirmation, and SILF40X125 if no sensing is required on this axis. SILB40X125S moves the lock to the rear cover instead of the rod end. If the cylinder must be bolted down rigidly, SILF40X125SLB adds the LB foot mounting to the same magnetic, front-locked, 125 mm specification.
Applications
Verified parking position
A switch reading the built-in magnet confirms the rod is held at the front cover before the next machine cycle starts, closing the loop that a non-magnetic SILF40X125 leaves open.
Stopper with position feedback
On a conveyor stopper, the 125 mm stroke lifts and lowers the stop blade while sensors on the magnet report raised and lowered states back to the line controller.
Interlocked access gate
The front lock holds a small gate closed when air is lost, and the magnet lets a safety circuit verify closure electrically; the manual lever allows a controlled release during maintenance.
FAQ
What are the key figures of the SILF40X125S?
40 mm bore, 125 mm stroke, double acting with a front-cover end lock and a built-in piston magnet for position sensors. Output is 628 N push / 528 N pull at 0.5 MPa and 880 N push / 739 N pull at 0.7 MPa. Ports 1/4" PT, rod thread M12x1.25 on a 16 mm rod, adjustable air cushions, pressure 0.15 - 1.0 MPa (proof 1.5 MPa), temperature -20 to +70 C, speed 30 - 800 mm/s.
Which cylinder arrives when I order SILF40X125S?
The SILF/SILB series is discontinued, so you receive the replacement SAILF40X125S - the same order code with the new SA prefix. All specifications quoted for this code are those of that SAILF40X125S unit.