Airtac SILF Front Locking Air Cylinder SILF125X400-S
Genuine AirTAC ø125 mm end-lock iso 15552 cylinder, order code SILF125X400-S from the SIL125 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- Stroke400 mm
- MountingBasic (no mounting)
- VersionFront lock (F) · S · PT
- Bore sizeØ125 mm
- Stock strokes25 – 1150 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 SILF125X400-S
SILF125X400-S belongs to the discontinued SILF/SILB series, and AirTAC fills the order with SAILF125X400S - the identical code under the current SAIL prefix - so the old order number still works. The cylinder is double acting to ISO 15552 with a 125 mm bore, a 400 mm stroke, an end lock in the front (rod-end) cover and the S magnet fitted for position sensors.
At 400 mm of stroke the body is long, so mounting and buckling under side loads deserve attention even though force is unchanged by travel: 6136 N push and 5734 N pull at 0.5 MPa, rising to 8590 N push and 8027 N pull at 0.7 MPa. The unit has 1/2 inch PT ports, an M27x2 rod thread and adjustable air cushions, works on 40 um filtered air at 0.15 to 1.0 MPa (proof 1.5 MPa), -20 to +70 C, and moves at 30 to 800 mm/s.
Airtac SILF Front Locking Air Cylinder SILF125X400-S Technical Specifications
| Order code | SILF125X400-S |
|---|---|
| Product | Ø125 mm end-lock ISO 15552 cylinder |
| Stroke | 400 mm |
| Mounting | Basic (no mounting) |
| Version | Front lock (F) · S · PT |
| Bore size | Ø125 mm |
|---|---|
| Stock strokes | 25 – 1150 mm |
| Catalog standard stroke | up to 1500 mm (longer on request) |
| Acting type | Double acting, with end lock |
| Lock position | Front cover (F) or rear cover (B) |
| Lock release | Automatic (air on the lock-side port) or manual lever |
| Port size | 1/2" (PT standard) |
| Piston rod / rod thread | Ø32 mm / M27×2 |
| 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
Neighbouring strokes make the comparison simple: SILF125X300-S costs less length and air for 300 mm of travel, SILF125X450-S and other longer codes extend reach - none of them change the 6136 N / 8590 N push figures, so choose by travel alone and ask for a quote if 400 mm is not your exact length.
This code is basic (no mounting letter), which on a 400 mm body may warrant a support or a dedicated mounting: LB foot, FA front flange, CB double clevis, TC center trunnion or FTC front trunnion can be added to the code for rigid or pivoting installation. The F lock holds the piston at the front cover - SILB125X400-S holds at the rear cover instead - the S magnet is built in, and G converts the ports from PT to G (BSPP).
Applications
Long-travel indexing pusher
A 400 mm stroke indexes product across wider conveyor sections; the adjustable air cushions tame the end of stroke at speeds from 30 to 800 mm/s, and the front-cover lock parks the pusher positively at the rod end.
Lift-and-lock material handling
In lifting fixtures the end lock holds the load at the front cover while the lock-side port is exhausted, so a dropped supply does not lower the load; air or the manual lever releases it when the cycle resumes.
Heavy gate and hopper gate actuation
Gates and hopper slides in the 400 mm range benefit from the 125 mm bore output - 8590 N push at 0.7 MPa - plus the S magnet feeding open/closed signals to the control system.
FAQ
What are the key figures for the SILF125X400-S?
Stroke 400 mm, bore 125 mm, rod 32 mm with M27x2 thread, 1/2 inch PT ports, double acting with end lock in the front cover, built-in magnet (S), basic body with no mounting code. Pressure 0.15 to 1.0 MPa (proof 1.5 MPa), temperature -20 to +70 C, speed 30 to 800 mm/s, air filtered to 40 um, adjustable air cushions. Force: 6136 N push / 5734 N pull at 0.5 MPa; 8590 N push / 8027 N pull at 0.7 MPa. Supplied as SAILF125X400S.
Since SILF is discontinued, what exactly do I receive?
You receive SAILF125X400S - AirTAC's current replacement for the SILF125X400-S code, carrying the same code after the prefix. Every figure quoted for this page, from the 400 mm stroke and 1/2 inch PT ports to the front-cover lock and magnet option, describes the SAILF125X400S that ships; the old SIL version itself is no longer produced.