Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25 is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke25 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 SAILF40X25
The AirTAC SAILF40X25 is a double-acting ISO 15552 profile cylinder equipped with a mechanical lock in the front cover. It delivers a push force of 879N at 0.7MPa, utilizing a 16mm carbon steel rod and a 1/4 inch PT port. Because the lock is spring-applied and air-released, cutting the release air drives a pin into the rod to hold the load securely at the extended stroke end without requiring continuous live pressure.
This static holding mechanism engages only after the piston reaches the front stroke terminal, meaning it will not clamp a moving rod at an arbitrary mid-stroke point. To accommodate the locking hardware, the variable air cushion at the locker end is shorter, measuring 20mm compared to the 27mm cushion on the free end. You can unlock the rod automatically by supplying air to the release port or by using the manual release lever.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 25 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 SAILF40X25 Is Used
Extended Rod Safety Hold
Secures a vertical load in the extended position on power loss, preventing gravity-driven collapses without needing continuous air pressure.
End-of-Stroke Clamping
Holds a workpiece firmly at the front stroke terminal during a machining or assembly cycle, releasing only when air is restored.
Gate and Guard Positioning
Keeps safety gates and machine guards locked open at the full extended stroke end until the control system actively releases the lock.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25 the Right Lock Cylinder?
Choose this 40mm bore when your application requires up to 879N of push force at 0.7MPa; step up to the 50mm bore if you need 1374N, or down to a smaller profile if your load is lighter. Select the SAILF front-locker variant when the rod must be held in the extended position, and choose SAILB if the retracted position must be secured. If your design requires locking at an arbitrary mid-stroke point rather than the stroke end, use the BSAI clamp-lock cylinder instead.
For safe operation, never use a fast-exhaust valve with this lock cylinder; back-pressure on the locker side can accidentally release the lock, so an independent-exhaust solenoid valve is required. The lock provides a static hold after the cylinder stops, not a dynamic brake. If human safety depends on the load staying extended, add an independent safety measure. To replace this unit, match the 40mm bore, 25mm stroke, front lock position, PT port threads, and standard mounting options like FA, FB, or TC.
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 SAILF40X25 FAQ
At 0.7MPa operating pressure, the 40mm bore provides a push force of 879N and a pull force of 628N. The maximum operating pressure is 1.0MPa.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end in the front cover. It provides a static hold, not a dynamic brake. Unlock it automatically by supplying release air or manually via the release lever.
Related AirTAC Lock & Standard Cylinders
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