Airtac SILF Front Locking Air Cylinder SILF63X250-S
Genuine AirTAC ø63 mm end-lock iso 15552 cylinder, order code SILF63X250-S from the SIL63 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- Stroke250 mm
- MountingBasic (no mounting)
- VersionFront lock (F) · S · PT
- Bore sizeØ63 mm
- Stock strokes10 – 1000 mm
- Catalog standard strokeup to 1500 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 SILF63X250-S
The SILF63X250-S pairs 250 mm of travel with a 63 mm ISO 15552 end-lock cylinder. The lock sits in the front (rod-end) cover: while the lock-side port is exhausted, the piston is held mechanically, so the rod stays put if air is lost. Air on that port releases the lock automatically, or a manual lever frees it by hand. At 0.5 MPa the bore pushes 1559 N and pulls 1402 N; at 0.7 MPa it reaches 2182 N and 1962 N. The trailing S in the code means a magnet is built into the piston, so position sensors can read it anywhere along the 250 mm.
The SILF/SILB series is discontinued, so this order code is supplied as the current SAILF63X250S with the same code after the prefix. Every figure here describes that replacement unit: 3/8" PT ports, M16x1.5 thread on a 20 mm rod, adjustable air cushions, 0.15-1.0 MPa working pressure (proof 1.5 MPa), -20 to +70 C and 30-800 mm/s on air filtered by a 40 um element.
Airtac SILF Front Locking Air Cylinder SILF63X250-S Technical Specifications
| Order code | SILF63X250-S |
|---|---|
| Product | Ø63 mm end-lock ISO 15552 cylinder |
| Stroke | 250 mm |
| Mounting | Basic (no mounting) |
| Version | Front lock (F) · S · PT |
| Bore size | Ø63 mm |
|---|---|
| Stock strokes | 10 – 1000 mm |
| Catalog standard stroke | up to 1500 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 | 3/8" (PT standard) |
| Piston rod / rod thread | Ø20 mm / M16×1.5 |
| 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
Choose the blank mounting only if your fixture grips the cylinder body itself: this code arrives without the FA front flange, TC center trunnion or FTC front trunnion that neighbouring codes add. For a rigid straight-line load the FA flange is the usual pick; if the load travels in an arc, step up to the TC center trunnion instead.
Two more option codes matter here. Drop the trailing S and no sensor will trigger, since the magnet is what the S buys. A blank port code gives 3/8" PT thread, while selecting G switches to G (BSPP). F fixes the end lock in the front cover; the SILB codes move it to the rear cover, though this bore is offered with front locks only.
Applications
Fail-safe clamp hold
If supply pressure drops while a 250 mm stroke clamp is closed on the part, the front-cover lock keeps the piston where it was; air to the lock-side port, or the manual lever, releases it again.
Pneumatic gate or stopper
A 63 mm bore at 0.5 MPa delivers 1559 N push, enough to divert or stop product on a conveyor lane, while the built-in magnet lets sensors report gate-open and gate-closed to the controller.
Eject or part kick-off
The end lock parks the rod at the front cover between cycles, so a 250 mm eject stroke does not creep back while the lock-side 3/8" port sits vented.
FAQ
What are the key figures of the SILF63X250-S?
Bore 63 mm, stroke 250 mm, rod 20 mm with M16x1.5 thread, ports 3/8" PT. Force: 1559 N push / 1402 N pull at 0.5 MPa, and 2182 N / 1962 N at 0.7 MPa. Operating pressure 0.15-1.0 MPa (proof 1.5 MPa), temperature -20 to +70 C, speed 30-800 mm/s, adjustable air cushions, magnet for position sensors, end lock in the front cover with automatic and manual release.
Is the SILF63X250-S discontinued?
Yes. AirTAC has replaced the SILF/SILB series with SAILF/SAILB, so a SILF63X250-S order is supplied as SAILF63X250S, the same code with the new prefix. All specifications above are those of the SAILF cylinder you receive. Hyphenated variants of the code order the same cylinder; only the prefix changes.