Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X50
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X50 is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 50mm 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
- Stroke50 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 SAILF40X50
The AirTAC SAILF40X50 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock built into the front cover. This lock engages when the piston reaches the extended stroke end, securely holding the rod-out position without requiring continuous live air pressure. Delivering 628N of push force and 528N of pull force at 0.5MPa, it provides reliable linear motion for lighter loads.
The lock is a static holding device, not a dynamic brake for a moving rod. For position feedback, adding a -S magnet enables CMSE reed and DMSE solid-state sensors in the dual-side barrel grooves. Note that the variable air cushion at the locker end is 20mm, intentionally shorter than the 27mm cushion on the free end to accommodate the locking mechanism.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X50 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X50 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAILF40X50 Is Used
Vertical Lift Hold
Maintains an elevated load at the extended stroke end during air pressure loss, preventing sudden drops.
Extended Clamp Hold
Secures a clamped workpiece in the rod-out position without consuming continuous compressed air.
Gate Safety Stop
Locks a barrier or gate open at full extension until an air signal safely releases the mechanism.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X50 the Right Lock Cylinder?
Choose this 40mm bore model when your application requires maintaining an extended position during power loss or pneumatic exhaustion. If your process requires higher force, stepping up to the 50mm bore yields 982N of push force at 0.5MPa. Select the SAILF configuration to hold the rod-out extended end, whereas SAILB holds the retracted rod-in end. If your design requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, use the BSAI clamp-lock cylinder instead.
Ensure your replacement matches the 50mm stroke, front locker position, 1/4 PT port, and standard carbon steel rod. Avoid using fast-exhaust valves with this cylinder; back-pressure on the locker side can unintentionally release the lock, so utilize an independent-exhaust solenoid valve. For any human-safety critical lifting application, always add an independent mechanical safety measure beyond the pneumatic lock.
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 SAILF40X50 FAQ
At 0.5MPa operating pressure, the 40mm bore provides 628N of push force and 528N of pull force. The maximum operating pressure is 1.0MPa.
The lock is spring-applied and air-released, engaging statically when the rod reaches the extended stroke end. It is not a mid-stroke clamp or dynamic brake. Unlocking occurs automatically via air supply to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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