Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 400mm 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
- Stroke400 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 SAILF50X400
The AirTAC SAILF50X400 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This mechanism secures the rod specifically at the extended stroke end, retaining loads safely without relying on continuous live air pressure. In the 50 mm bore class, it generates 982 N of push force and 825 N of pull force at 0.5 MPa.
A key design trait is that the variable air cushion at the locker end is shorter (20 mm) compared to the free end (30 mm). The lock engages statically after the piston stops; it is not a dynamic brake for a moving rod. For position feedback, adding a magnet allows the use of AirTAC CMSE reed or DMSE electronic sensors in the dual-side barrel grooves.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 400 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 SAILF50X400 Is Used
Vertical Lift Hold
Secures an elevated load at the extended rod-out position during a power loss, preventing sudden drops without needing continuous air pressure.
Pallet Stop Gate
Holds a pallet at the end of the stroke extended outward, maintaining a physical barrier until the release air is supplied.
Extended Clamp Hold
Maintains a static clamping force on a part at the forward stroke end while machinery cycles, saving energy by dropping live pressure.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400 the Right Lock Cylinder?
Choose this 50 mm bore when an application requires 982 N push force at 0.5 MPa; step down to a 40 mm bore (628 N) for lighter loads, or up to a 63 mm bore (1559 N) for heavier demands. Select this SAILF front-lock variant to hold the rod-out extended position, whereas a SAILB back-lock version holds the retracted position. If your process requires clamping at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct choice.
Because the stroke is 400 mm, ensure external guide rails are used to prevent excessive side-loading on the rod. Crucially, do not use a fast-exhaust valve with this cylinder; back-pressure on the locker side can unintentionally release the lock, so an independent-exhaust solenoid valve is required. If human safety depends on the load staying elevated, always add an independent mechanical safety measure beyond this pneumatic lock. Replacement match: 50 mm bore, 400 mm stroke, front lock, PT port, no 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 SAILF50X400 FAQ
At 0.5 MPa operating pressure, the 50 mm bore 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 only at the fully extended stroke end. It engages statically after the cylinder stops and is unlocked by supplying air to the release port or using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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