Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25S is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 25mm 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.
- BoreØ50 mm
- Stroke25 mm
- Port sizeG1/4
- Lock positionFront cover
- Rod threadM16×1.5
- 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 SAILF50X25S
The AirTAC SAILF50X25-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released mechanical lock housed in the front cover. Because the lock sits in the front end, it engages only when the piston reaches the extended stroke end, holding the rod securely out without relying on live air pressure. Driven by a 20mm carbon steel rod, this 50mm bore unit generates 982N of push force and 825N of pull force at 0.5 MPa. It includes a -S magnet for precise position sensing using AirTAC CMSE reed or DMSE solid-state switches.
This model features a variable air cushion at both ends, but the cushion at the locker end is notably shorter at 20mm compared to the 30mm cushion on the free end. The lock is a static holding device that engages after the cylinder stops; it is not a dynamic brake for a moving rod. To release the load, you can supply air to the release port for automatic unlocking or use the manual release lever.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 25 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 (30 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SAILF50X25S Is Used
Extended Load Holding
Maintains a lifted platform securely at the extended stroke end during air pressure loss, preventing gravity-driven collapses.
Clamp and Secure
Holds a workpiece or gate open at the front terminal position without consuming continuous air supply, cutting energy costs.
Power Failure Safety
Provides a fail-safe mechanical stop for vertical doors and safety flaps that must remain extended if the pneumatic system shuts down.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25S the Right Lock Cylinder?
Choose this 50mm bore cylinder when your application requires holding a load at the fully extended stroke end on power loss, generating a push force of 982N at 0.5 MPa. If your mechanism needs to secure the load at the retracted position instead, select the SAILB variant. For applications that demand locking at an arbitrary mid-stroke point rather than a stroke terminal, the BSAI clamp-lock cylinder is the correct choice. Always avoid using fast-exhaust valves with this lock cylinder; an independent-exhaust solenoid valve is required because back-pressure on the locker side can unintentionally release the lock. If human safety depends on the load staying extended, add an independent safety measure as well.
When replacing this unit, verify the 50mm bore, 25mm stroke, front locker position, 1/4 PT port thread, and the -S magnet option. The carbon steel rod and standard 25mm stroke keep the overall footprint compact while maintaining the full ISO 15552 mounting interface compatibility.
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 SAILF50X25S FAQ
At 0.5 MPa operating pressure, this 50mm bore cylinder provides a push force of 982N and a pull force of 825N. The maximum push force reaches 1767N at 0.7 MPa.
The lock is spring-applied and engages automatically when the piston reaches the extended stroke end, holding the load without air pressure. To unlock, supply air to the release port for automatic release, or use the manual release lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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