Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900 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 SAILF50X900
The AirTAC SAILF50X900 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. This spring-applied, air-released lock engages automatically when the piston reaches the extended stroke end, securely holding a 982N load at 0.5 MPa without requiring continuous air pressure. You can release the lock pneumatically via the air port or use the manual override lever. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed and DMSE electronic switches, though this unit ships without a magnet.
Because the lock mechanism occupies one end cover, the variable air cushion at the locker end is only 20mm long, which is shorter than the 30mm cushion on the free end. The standard carbon steel rod provides reliable durability for demanding cycles. This 900mm stroke falls within the 1200mm maximum standard stroke limit for the 50mm bore, operating smoothly at speeds between 30 and 800mm/s.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900 |
|---|---|
| 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 SAILF50X900 Is Used
Vertical Lift Hold
Maintains a raised platform securely at the extended stroke end during a power loss, preventing sudden drops.
Extended Divert Stop
Locks a diverter arm in the out position to halt items on a conveyor without consuming continuous air.
Gate Safety Hold
Keeps a heavy safety gate fully open and locked until the release air is actively supplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X900 the Right Lock Cylinder?
Choose this 50mm bore when an application requires holding a load at the fully extended position, delivering 982N of push force at 0.5 MPa. If your project needs less force, the 40mm bore offers 628N; if you need more holding power, step up to the 63mm bore which provides 1559N. Select the SAILF configuration specifically when the extended rod-out position is the safety-critical state. If your machine must hold a load at an arbitrary mid-stroke point rather than the stroke end, choose the BSAI clamp-lock cylinder instead.
Always remember the SAIL lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. For safety-critical vertical lifts, add an independent mechanical safety measure. When replacing this unit, match the 50mm bore, 900mm stroke, front locker position, PT tapered port thread, and mounting style. Given the 900mm stroke, use a side-load guide or external rail to prevent rod deflection and premature seal wear.
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 SAILF50X900 FAQ
At a 0.5 MPa operating pressure, this 50mm bore cylinder provides 982N of push force and 825N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 200 kgf.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end in the front cover. It holds the load statically without live pressure and is released automatically by supplying air to the release port or manually via the lever.
Related AirTAC Lock & Standard Cylinders
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