Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400S 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 SAILF50X400S
The AirTAC SAILF50X400-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because it is an F-type model, the spring-applied, air-released lock engages precisely at the extended stroke end, securely holding the rod-out position. It delivers a push force of 982N and a pull force of 825N at 0.5 MPa, making it highly capable for medium-duty load control. The standard carbon steel rod and integrated magnet enable precise position detection.
This cylinder features a variable air cushion at both ends, though the locker-end cushion is notably shorter at 20 mm compared to the 30 mm cushion on the free end. The lock itself is a static holding device that engages only after the piston stops at the stroke terminal, rather than acting as a dynamic brake mid-travel. To release the load, operators can supply air to the release port for automatic unlocking or use the manual release lever.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400S |
|---|---|
| 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 SAILF50X400S Is Used
Vertical Lift Safety
Holds an extended vertical load securely in place during a power loss event, preventing sudden drops via the front-cover mechanical lock.
Extended Position Diverter
Maintains an extended diverter arm locked out on a conveyor line without consuming continuous compressed air, saving energy.
End-of-Stroke Clamp
Locks a workpiece firmly at the full extension point, ensuring zero rod drift during machining or pressing operations.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X400S the Right Lock Cylinder?
Choose this 50 mm bore when your application requires up to 982N of push force at 0.5 MPa; if your load demands less force, stepping down to a 40 mm bore provides 628N, while upgrading to a 63 mm bore yields 1559N. Select the SAILF configuration specifically when you need the load held securely at the extended rod-out position, whereas a SAILB variant holds the retracted position. If your application requires clamping at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is the correct choice instead.
Because this model has a 400 mm stroke, mounting must account for side-load forces; using a non-rotating guide or external support is recommended to prevent rod binding. The lock holds the load statically without live pressure, but back-pressure on the locker side can unintentionally release it, so avoid fast-exhaust valves and use an independent-exhaust solenoid valve. For safety-critical suspended loads, always add an independent mechanical safety measure. Replacement requires matching the 50 mm bore, 400 mm stroke, front locker position, PT tapered port thread, and the -S magnet for CMSE reed and DMSE electronic sensors.
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 SAILF50X400S FAQ
At 0.5 MPa operating pressure, this 50 mm bore cylinder provides 982N of push force and 825N of pull force. At 0.7 MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, engaging statically only when the piston reaches the extended stroke end in the front cover. It does not clamp mid-stroke; for any-position locking, use a BSAI cylinder. Unlocking is achieved automatically via air pressure or manually via a lever.
Related AirTAC Lock & Standard Cylinders
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