Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250 is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm bore, 250mm 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.
- BoreØ80 mm
- Stroke250 mm
- Port sizeG3/8
- Lock positionFront cover
- Rod threadM20×1.5
- 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 SAILF80X250
The AirTAC SAILF80X250 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This lock engages automatically to hold the rod securely at the extended stroke end whenever the release air is cut, ensuring your load remains safely positioned without requiring continuous live pressure. It delivers a robust 2513N of push force at 0.5 MPa, utilizing a 25mm carbon steel rod and 3/8 PT ports.
Because the lock physically occupies space inside the front end cap, the variable air cushion on the locker side is shorter at 22.5mm compared to the 36mm cushion on the free end. Unlocking is achieved by supplying air to the release port for automatic operation or by using the manual release lever. The extruded aluminum barrel includes sensor grooves on both sides, ready to accept CMSE reed or DMSE electronic switches if a magnet is specified later.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 250 mm |
| Acting type | Double acting, with lock |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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 (36 mm free end / 22.5 mm lock end) |
| Max stroke | Up to 1500 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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 SAILF80X250 Is Used
Extended Load Holding
Maintains vertical loads safely at the extended stroke end during a power loss, preventing sudden drops without needing continuous air pressure.
Actuator Pause
Holds a pushed-out actuator firmly in place at the end of its stroke while a conveyor processes or inspects the transferred component.
Safety Gate Lock
Secures a safety gate or guard in the open, extended position until the release air is deliberately supplied to unlock the mechanism.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X250 the Right Lock Cylinder?
Choose this 80mm bore when an application requires holding a load out at the extended stroke end; if you need less force, the 63mm bore provides 1559N of push at 0.5 MPa, while stepping up to the 100mm bore yields 3927N. Select the SAILF front-locker configuration specifically to secure loads at the rod-out position, whereas a SAILB back-locker variant holds the retracted position. If your design requires clamping at an arbitrary mid-stroke point rather than a stroke-end hold, the BSAI clamp-lock cylinder is the correct choice instead.
For safe operation, remember this lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves with this cylinder; back-pressure on the locker side can unintentionally release the lock, so an independent-exhaust solenoid valve is required. At 250mm of stroke, ensure external guide rails are used to support side loads and prevent rod binding. To match this unit exactly, verify the 80mm bore, 250mm stroke, front locker position, 3/8 PT ports, and standard carbon steel rod without a 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 SAILF80X250 FAQ
At 0.5 MPa operating pressure, this 80mm bore cylinder provides 2513N of push force and 2268N of pull force. At 0.7 MPa, the push force increases to 3518N.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end in the front cover. It provides a static hold, not a dynamic brake, and is unlocked by supplying air to the release port or using the manual lever.
Related AirTAC Lock & Standard Cylinders
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