Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800 is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 800mm 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.
- BoreØ40 mm
- Stroke800 mm
- Port sizeG1/4
- Lock positionFront cover
- Rod threadM12×1.25
- 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 SAILF40X800
The AirTAC SAILF40X800 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This built-in lock engages automatically when the piston reaches the extended stroke end, safely holding a load of up to 879N at 0.7MPa without requiring continuous live air pressure. You can unlock the rod pneumatically via the release port or use the manual override lever for maintenance.
Because this is a 800mm stroke model, the 16mm carbon steel rod requires external guide support to prevent excessive side-loading on the seals. The variable air cushion at the locker end is 20mm, which is shorter than the 27mm cushion on the free end to accommodate the locking mechanism. The barrel features dual sensor grooves, compatible with AirTAC CMSE reed and DMSE solid-state switches if a magnet is added later.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 800 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 (27 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SAILF40X800 Is Used
Extended Load Holding
Maintains a vertical load securely at the extended stroke end during a power loss or emergency stop, preventing sudden drops.
Flow Control Diverter
Keeps a conveyor sorting gate locked in the outward position until the system actively supplies release air to retract it.
Safety Barrier Actuation
Holds a protective machine guard open at the full extension point without consuming continuous compressed air.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800 the Right Lock Cylinder?
Choose this SAILF40X800 when your application specifically requires the load to be held securely at the extended rod-out position. If your safety requirement involves stopping and holding a load mid-stroke, the BSAI clamp-lock cylinder is the correct choice instead, as the SAIL lock only engages at the stroke terminal. For lower force needs, the 32mm bore is not available in the SAIL series, so the 40mm bore is the baseline option; for higher force demands, stepping up to the 50mm bore provides 1374N at 0.7MPa.
When integrating this cylinder, never use a fast-exhaust valve, as back-pressure on the locker side can inadvertently release the lock; always use an independent-exhaust solenoid valve. The lock provides a static hold after the cylinder stops and is not a dynamic brake. If human safety depends on the load remaining extended, add an independent mechanical safety measure. Replacement matching requires a 40mm bore, 800mm stroke, front locker position, PT tapered port threads, and standard carbon steel rod.
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 SAILF40X800 FAQ
The 40mm bore generates a push force of 879N at 0.7MPa and 1130N at 0.9MPa. The pull force is 528N at 0.5MPa. The maximum operating pressure is 1.0MPa.
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 mid-stroke clamping. To unlock, supply air to the release port or use the manual override lever.
Related AirTAC Lock & Standard Cylinders
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