Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 25mm 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
- Stroke25 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 SAILF50X25
The AirTAC SAILF50X25 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. Because the lock engages when the piston reaches the extended stroke end, it securely holds the rod-out position without requiring continuous live air pressure. Delivering 982N of push force at 0.5MPa, this bore 50mm unit is built for vertical load-holding tasks.
The integrated lock is a static holding device, not a dynamic brake for a moving rod. To ensure the mechanism functions correctly, the variable air cushion at the locker end is shorter (20mm) than the free end (30mm). The lock releases automatically via air supply to the release port or manually via a lever, but back-pressure on the locker side can unintentionally lift the lock, so an independent-exhaust solenoid valve is required.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 25 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 SAILF50X25 Is Used
Vertical Lift Holding
Secures elevated loads in the extended position during a power loss, preventing sudden drops in lifting jib arms.
Safety Gate Lock
Keeps heavy access gates firmly locked open at the end of the stroke until the release air is actively supplied.
Clamp and Hold
Maintains outward clamping pressure on a part at the stroke terminal without consuming continuous compressed air.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X25 the Right Lock Cylinder?
Choose this SAILF50X25 when a load must be safely suspended at the fully extended rod-out position. If your application requires holding at the retracted rod-in position instead, select the SAILB50X25. Alternatively, if you need to clamp the rod at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is the correct choice.
When specifying a replacement, verify the 50mm bore, 25mm stroke, front locker position, PT tapered port threads, and standard carbon steel rod. Because human safety should never rely solely on pneumatic holding, add an independent mechanical safety measure for elevated loads. Avoid fast-exhaust valves entirely, as they disrupt the pressure balance needed to keep the lock engaged.
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 SAILF50X25 FAQ
At 0.5MPa operating pressure, the bore 50mm cylinder provides 982N of push force and 825N of pull force. At 0.7MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, engaging statically only when the rod reaches the fully extended stroke end. It unlocks automatically via air pressure to the release port or manually via a lever, but it cannot clamp the rod at a mid-stroke position.
Related AirTAC Lock & Standard Cylinders
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