Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X400
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X400 is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm 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.
- BoreØ80 mm
- Stroke400 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 SAILF80X400
The AirTAC SAILF80X400 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This mechanism engages automatically when the piston reaches the extended stroke end, securely holding the rod out without relying on continuous live air pressure. Delivering 2513N of push force at 0.5MPa, it provides substantial load handling for demanding setups.
Because the lock occupies the front end, the variable air cushion on that side is shorter at 22.5mm compared to the 36mm cushion on the free back end. The unit uses a 25mm carbon steel rod with an M20x1.5 thread, offering robust side-load resistance. For position sensing, adding a magnet allows the use of CMSE reed or DMSE electronic sensors.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X400 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X400 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 400 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 SAILF80X400 Is Used
Vertical Lift Safety
Holds a lifted load securely at the extended top stroke end during a sudden power loss, preventing uncontrolled drops.
Pallet Stopper
Locks the rod out to halt heavy pallet traffic on a line, maintaining the block without consuming continuous air.
Overhead Door Hold
Keeps a heavy gate or door firmly open at full extension, releasing only when commanded by control air.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF80X400 the Right Lock Cylinder?
Choose this 80mm bore when 50mm bore cylinders fall short, as the 50mm variant only yields 982N push at 0.5MPa compared to this model's 2513N. Select SAILF when the load must remain held at the extended rod-out position, whereas SAILB holds the retracted rod-in end. If your application requires clamping at an arbitrary mid-stroke point rather than a stroke-end hold, use the BSAI clamp-lock cylinder instead.
With a 400mm stroke, adding an external guide is recommended to prevent excessive side-load wear on the rod seals. Remember that this lock is a static holding device, not a dynamic brake for a moving rod. Avoid fast-exhaust valves, as back-pressure on the locker side can accidentally release the lock; use an independent-exhaust solenoid valve. For human-safety critical overhead loads, always add an independent safety measure. Replacement requires matching the 80mm bore, 400mm stroke, front locker position, PT port, and mounting style.
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 SAILF80X400 FAQ
At 0.5MPa, it provides 2513N of push force and 2268N of pull force. At 0.7MPa, the push force increases to 3518N.
The lock is spring-applied and air-released, engaging only after the rod fully extends to the stroke end. It holds statically and does not brake a moving rod. Unlocking happens automatically via control air or manually via a lever.
Related AirTAC Lock & Standard Cylinders
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