Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X225S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X225S is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm 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.
- BoreØ50 mm
- Stroke225 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 SAILF50X225S
The AirTAC SAILF50X225-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock housed within the front end cover. Because the lock is spring-applied and air-released, it automatically engages to hold the rod securely at the extended stroke end whenever the release air is cut. Delivering 982N of push force and 825N of pull force at 0.5MPa, this carbon-rod unit ensures reliable load management during power loss.
This model includes a magnetic piston (-S) for direct compatibility with CMSE reed and DMSE electronic solid-state sensors. The variable air cushion at the locker end is notably shorter at 20mm compared to the 30mm cushion on the free end, providing tailored deceleration. Remember that the lock engages only after the piston stops; it is a static holding device, not a dynamic brake for a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X225S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X225S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 225 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 SAILF50X225S Is Used
Extended Lift Holding
Secures vertical loads in the raised rod-out position during a power loss, preventing sudden drops without needing continuous air pressure.
Clamp and Hold
Maintains outward clamping force at the stroke end on machining fixtures, keeping the workpiece locked without consuming energy.
Safety Gate Lock
Holds safety gates and access barriers securely open at the extended terminal, remaining locked until the release air is actively supplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X225S the Right Lock Cylinder?
Choose this 50mm bore when an application demands 982N of thrust at 0.5MPa; if your load requires less force, stepping down to a 40mm bore yields 628N, whereas heavier loads might necessitate the 63mm bore providing 1559N. Select the SAILF configuration specifically when the load must be secured in the extended rod-out position, as opposed to the SAILB variant which holds retracted. If your machinery requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, the BSAI clamp-lock cylinder is the correct choice.
For safe operation, avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; an independent-exhaust solenoid valve is required. This PT-ported cylinder uses a 1/4 port and supports the full ISO 15552 mounting set including Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, and TCM2. At a 225mm stroke, ensure external guides are used to manage side loads and prevent rod binding. If human safety relies on this load staying elevated, always add an independent mechanical safety measure.
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 SAILF50X225S FAQ
At an operating pressure of 0.5MPa, this 50mm bore cylinder generates 982N of push force and 825N of pull force. At 0.7MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, engaging automatically to hold the rod at the extended stroke end when air is cut. It unlocks via air supply to the release port or a manual lever, but it is a static hold that only engages after the piston stops, not a mid-stroke clamp.
Related AirTAC Lock & Standard Cylinders
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