Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250S is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 250mm 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
- Stroke250 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 SAILF50X250S
The AirTAC SAILF50X250-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. Because the lock sits at the front, it engages when the piston reaches the extended stroke end, securing the rod-out position. In the 50 mm bore class, this actuator generates 982 N of push force and 825 N of pull force at 0.5 MPa, utilizing a 20 mm carbon steel rod.
This model includes a magnetic piston (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The variable air cushion decelerates the load near the stroke terminals, with the front locker-end cushion measuring 20 mm compared to 30 mm on the free end. Remember that the lock provides a static hold after the cylinder stops; it is not a dynamic brake for a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 250 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 SAILF50X250S Is Used
Extended Lift Holding
Maintains a vertical lift securely in the extended rod-out position during a power loss, preventing sudden drops without relying on live air pressure.
Pallet Stop Gate
Holds an extended pallet stop gate rigidly in place at the end of the stroke while goods transfer, absorbing impact without backdriving the cylinder.
Clamp and Secure
Extends to clamp a workpiece at the stroke end and mechanically locks the position, ensuring the clamp remains firm even if shop air fluctuates.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X250S the Right Lock Cylinder?
Choose this 50 mm bore when an application requires 982 N of thrust at 0.5 MPa and a secure hold at the extended position. If your load demands less force, stepping down to a 40 mm bore yields 628 N of push force, whereas moving up to a 63 mm bore provides 1559 N. Select the SAILF configuration for rod-out holding, or switch to SAILB if the load must be held retracted. If the mechanism requires clamping at an arbitrary mid-stroke point rather than the end, the BSAI clamp-lock cylinder is the correct choice.
For reliable operation, avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. The 250 mm stroke necessitates external guide rails to prevent excessive side-loading on the rod. To replace this unit, match the 50 mm bore, 250 mm stroke, front lock position, PT port threads, and the -S magnet option.
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 SAILF50X250S FAQ
At 0.5 MPa operating pressure, the 50 mm bore generates 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
The spring-applied, air-released lock engages automatically when the piston reaches the extended stroke end, holding the load without live pressure. It unlocks by supplying air to the release port or by using the manual release lever. It provides a static hold only, not mid-stroke clamping.
Related AirTAC Lock & Standard Cylinders
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