Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X225S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X225S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 225mm stroke and a built-in spring-applied, air-released mechanical lock in the front cover — it holds the load at the extended (rod-out) stroke end even when air is lost.
- BoreØ40 mm
- Stroke225 mm
- Port sizeG1/4
- Lock positionFront cover
- Rod threadM12×1.25
- UnlockAir + manual
- 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 SAILF Front Locking Pneumatic Cylinder SAILF40X225S
The AirTAC SAILF40X225-S is a double-acting ISO 15552 profile cylinder with a spring-applied, air-released mechanical lock housed in the front cover. This lock engages when the piston reaches the extended stroke end, holding the rod out without relying on live air pressure. Equipped with a magnet for position sensing, it pairs directly with AirTAC CMSE reed and DMSE electronic solid-state sensors fitted into the dual-side barrel grooves.
In the 40mm bore class, this actuator yields a 0.5MPa push force of 628N and a pull force of 528N. The front locker cover incorporates a shorter 20mm variable air cushion compared to the 27mm cushion on the free back end, ensuring controlled deceleration before the mechanical lock takes over the static load hold.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X225S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X225S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 225 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Lock type | Spring-applied, air-released (front cover) |
|---|---|
| Unlock | Automatic (air) & manual |
| Operating pressure | 0.15 – 1.0 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable (27 mm free end / 20 mm lock end) |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAIL datasheet (ISO 15552). Confirm against the product label before installation. Port options: PT / G.
How the Lock Holds
The lock is spring-applied and air-released: a spring drives a lock pin into the rod when the release air is removed, so the load is held at the extended (rod-out) stroke end without live pressure. Supply air to the release port to unlock automatically, or use the manual release lever.
The lock engages only when the piston reaches the stroke terminal on the front-cover side — it is a static end-of-stroke hold, not a mid-stroke clamp and not a moving-rod brake. For locking at any position along the stroke, choose a BSAI clamp-lock instead.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Cylinder thrust is separate from the lock's holding capability. Actual usable force is lower than theoretical due to friction and back-pressure — size with a margin.
Where the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X225S Is Used
Extended Load Holding
Secures vertical loads in the extended out position during power loss, preventing gravity-driven collapses without needing continuous air supply.
End-Stop Clamping
Holds a conveyor workpiece firmly at the extended stroke terminal for assembly or inspection, releasing automatically only when release air is supplied.
Gate Safety Barrier
Keeps safety gates and machine guards locked in the open extended position, requiring an intentional air signal to unlock and close.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X225S the Right Lock Cylinder?
Choose this SAILF model when your application requires the rod to be securely held at the extended out-stroke end during a power loss or air cutoff. If your load must be clamped at an arbitrary mid-stroke position rather than the stroke terminal, the AirTAC BSAI clamp-lock cylinder is the correct alternative. For higher force needs, stepping up to the 50mm bore provides a 982N push force at 0.5MPa.
This lock is a static holding device, not a dynamic brake for a moving rod. Never use a fast-exhaust valve with this unit; an independent-exhaust solenoid valve is required because back-pressure on the locker side can inadvertently release the lock. If human safety relies on the load staying extended, add an independent mechanical safety measure. Replacement specifications: 40mm bore, 225mm stroke, front locker, PT 1/4 ports, carbon steel rod, -S magnet, and standard ISO 15552 mounting options including FA, FB, and TC.
Quick checklist
- ✓ Hold needed at the extended (rod-out) end?
- ✓ Or lock anywhere → use BSAI
- ✓ Independent-exhaust valve fitted
- ✓ Port/thread type (PT/G)
- ✓ Extra safety measure for people
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X225S FAQ
At 0.5MPa operating pressure, the 40mm bore provides a push force of 628N and a pull force of 528N. At 0.7MPa, the push force increases to 879N.
The lock is spring-applied and air-released. It statically holds the rod only at the extended stroke end after the cylinder stops. It unlocks automatically via air supply to the release port or manually via the release lever.
Related AirTAC Lock & Standard Cylinders
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