Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25S 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 SAILF40X25S
The AirTAC SAILF40X25-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because it is an F-series unit, the spring-applied, air-released lock engages when the piston reaches the extended stroke end, securely holding the rod-out position. In the 40mm bore class, it generates 879N of push force at 0.7MPa, making it well-suited for compact load-holding tasks.
This model includes a magnetic piston (-S) for precise position detection using CMSE reed or DMSE solid-state sensors. The variable air cushion at the locker end is specifically shortened to 20mm to accommodate the locking hardware, compared to 27mm on the free end. The lock itself is a static holding device that engages after the cylinder stops, rather than a dynamic brake for a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25S |
|---|---|
| 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 SAILF40X25S Is Used
Vertical Lift Hold
Secures an extended vertical lift in place automatically when air pressure drops, preventing sudden collapses.
Extended Clamp Hold
Maintains a clamping force at the full rod-out position without consuming continuous compressed air.
Gate Safety Lock
Keeps a safety gate locked open at the end of stroke until a controlled air signal releases it.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25S the Right Lock Cylinder?
Choose this 40mm bore cylinder when you need to safely hold a load at the extended position during a power loss, as the 40mm class provides 628N push force at 0.5MPa. If your application requires a higher clamping force, stepping up to the 50mm bore yields 982N at 0.5MPa. Conversely, if you need to hold the rod-in position instead of rod-out, select the SAILB equivalent.
If your machinery requires locking at an arbitrary mid-stroke point rather than the stroke terminal, you must use the BSAI clamp-lock cylinder instead of this SAIL model. For reliable operation, avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; always use an independent-exhaust solenoid valve. This unit features a PT tapered port, a carbon steel rod, and a 25mm stroke. For safety-critical suspended loads, 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 SAILF40X25S FAQ
The 40mm bore generates 628N of push force and 528N of pull force at 0.5MPa. At 0.7MPa, the push force is 879N, and it reaches 1130N at 0.9MPa.
The lock is spring-applied and air-released. It engages statically when the rod reaches the extended stroke end, holding the load without live pressure. To unlock, you supply air to the release port or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X25S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.