Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 900mm 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
- Stroke900 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 SAILF40X900S
The AirTAC SAILF40X900-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. It safely secures the load at the extended stroke end whenever release air is cut, delivering 879N of push force at 0.7 MPa. A carbon steel piston rod provides durable service, while the integrated -S magnet enables precise position detection using CMSE reed or DMSE electronic solid-state sensors.
Because the lock engages statically after the piston stops, the variable air cushion at the locker end is engineered shorter than the free end to optimize end-of-stroke deceleration without interfering with the holding mechanism. This 900mm stroke model operates at speeds between 30 and 800mm/s, utilizing a 1/4 PT port for pneumatic supply and release.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 900 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 SAILF40X900S Is Used
Vertical Lift Safety
Holds an elevated load at the extended stroke end automatically when air pressure drops, preventing sudden falls on vertical lifting jigs.
Pallet Stop Gate
Secures a pneumatically actuated pallet stop in the out position during power loss, ensuring items do not roll past the checkpoint.
Out-Position Clamp
Maintains outward clamping pressure on a machined part at the end of the stroke without consuming continuous live air pressure.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900S the Right Lock Cylinder?
Choose this 40mm bore when you need 879N of push force at 0.7 MPa; stepping up to the 50mm bore yields 1374N, while dropping below 40mm is not available in the SAIL series. Select this SAILF variant to hold the rod securely at the extended stroke end, whereas a SAILB configuration holds the retracted end. If your application requires clamping at an arbitrary mid-stroke position rather than a stroke-end hold, the BSAI clamp-lock cylinder is the correct choice.
For reliable operation, avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; instead, use an independent-exhaust solenoid valve. At 900mm of stroke, the extended rod is susceptible to side-loading, so external guide rails should be used to prevent cylinder binding. If human safety depends on the load remaining extended, add an independent mechanical safety measure. Replacement units must match the 40mm bore, 900mm stroke, front locker position, PT threads, and -S magnet specification.
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 SAILF40X900S FAQ
At 0.5 MPa it provides 628N of push force and 528N of pull force. At 0.7 MPa the push force is 879N, and at 0.9 MPa it reaches 1130N.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end. It holds statically after the rod stops and is unlocked by supplying air to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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