Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250 is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm 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.
- BoreØ63 mm
- Stroke250 mm
- Port sizeG3/8
- 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 SAILF63X250
The AirTAC SAILF63X250 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This mechanism engages automatically when the piston reaches the extended stroke end, securing the load without requiring continuous live air pressure. Delivering a push thrust of 1559 Newtons at 0.5 MPa, it utilizes a carbon steel rod with a 3/8 PT tapered port.
Unlike a standard SAI cylinder, this unit provides true power-failure safety, but it is strictly a static holding device and not a dynamic brake for moving rods. To accommodate the locking hardware, the variable air cushion at the front locker end is shorter at 21 mm compared to the 30 mm cushion on the rear free end. The lock releases automatically via air supply or manually via a lever, and adding an -S magnet enables electronic DMSE or reed CMSE sensors for position feedback.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 250 mm |
| Acting type | Double acting, with lock |
| Port size | G3/8 |
| 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 / 21 mm lock end) |
| Max stroke | Up to 1500 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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 SAILF63X250 Is Used
Extended Lift Holding
Maintains a vertical lift securely in the extended rod-out position during a power loss, preventing gravity-driven crashes without needing continuous air pressure.
Flow Stop Gate
Keeps a conveyor diversion gate fully extended and locked against passing loads, releasing only when the release air port is actively pressurized.
Out-Stroke Clamp
Secures a workpiece at the end of the forward stroke, providing a stable hold for secondary operations while the primary air supply is exhausted.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250 the Right Lock Cylinder?
Choose this 63 mm bore when an application requires 1559 N of push force at 0.5 MPa, stepping up from the 50 mm bore which provides 982 N, or down from the 80 mm bore offering 2513 N. Select the SAILF configuration when the load must be safely held in the extended rod-out position, whereas SAILB secures the retracted position. If your process demands clamping at an arbitrary mid-stroke point rather than the stroke terminal, the BSAI clamp-lock cylinder is the correct alternative.
Because the stroke is 250 mm, ensure adequate guide support to prevent side-load wear on the seals and locking pin. Remember that the lock holds statically only at the extended end and does not stop a moving rod. Avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; instead, use an independent-exhaust solenoid valve, and always add an independent mechanical safety measure if human safety depends on the load staying up. Replacement matches require a 63 mm bore, 250 mm stroke, front lock, 3/8 PT port, and your chosen ISO 15552 mounting like TC or FA.
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 SAILF63X250 FAQ
At 0.5 MPa operating pressure, this 63 mm bore cylinder provides 1559 N of push force and 1402 N of pull force. At 0.7 MPa, the push force increases to 2182 N.
The lock is spring-applied and air-released, engaging statically when the rod reaches the extended stroke end to hold the load without live pressure. It does not clamp at mid-stroke. Unlocking is achieved automatically by supplying air to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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