Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900S is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm 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.
- BoreØ50 mm
- Stroke900 mm
- Port sizeG1/4
- 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 SAILF50X900S
The AirTAC SAILF50X900-S is a double-acting ISO 15552 profile cylinder featuring a mechanical lock built into the front cover. Because the lock is spring-applied and air-released, it automatically secures the piston rod at the fully extended stroke end whenever release air is cut, ensuring loads remain safely held without live pressure. At 0.5 MPa, this 50 mm bore generates 982 N of push force and 825 N of pull force.
This unit includes a magnet (-S) for position sensing with CMSE reed or DMSE electronic switches. The variable air cushion at the locker end is 20 mm, intentionally shorter than the 30 mm cushion at the free end. Note that the lock engages only after the cylinder has stopped moving; it is a static holding device, not a dynamic brake.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 900 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| 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 / 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SAILF50X900S Is Used
Overhead Lift Safety
Secures elevated platforms at the extended stroke end during power loss, preventing sudden drops.
Material Stop Gate
Holds a heavy diverter gate open at the rod-out position without consuming continuous air supply.
Vertical Door Hold
Locks an extended vertical door in place securely, releasing only when pilot air is applied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900S the Right Lock Cylinder?
Choose this 50 mm bore if your application requires up to 982 N of push force at 0.5 MPa, or step up to the 63 mm bore (1559 N push at 0.5 MPa) for heavier lifting. Select this SAILF front-locker variant when the load must be held at the rod-out extended position; choose a SAILB back-locker version for retracted holds. If you need to clamp the rod at an arbitrary mid-stroke point rather than a stroke end, use the BSAI clamp-lock cylinder instead.
For reliable operation, avoid fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; use an independent-exhaust solenoid valve. With a 900 mm stroke, adding an external guide rail is recommended to manage side loads and prevent rod binding. Always add an independent safety measure for human-life critical overhead loads. Replacement requires matching the 50 mm bore, 900 mm stroke, front locker position, PT ports, and the -S magnet.
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 SAILF50X900S FAQ
At 0.5 MPa, this 50 mm bore cylinder provides 982 N of push force and 825 N of pull force. At 0.7 MPa, the push force increases to 1374 N.
The lock is spring-applied and air-released, located in the front cover to hold the rod at the extended stroke end. It engages statically after the cylinder stops and unlocks automatically via air supply or a manual release lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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