Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X450S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X450S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 450mm 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
- Stroke450 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 SAILF40X450S
The AirTAC SAILF40X450-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. Because the lock sits at the front, it engages when the piston reaches the extended stroke end, securely holding the rod-out position without requiring live air pressure. In this 40mm bore class, the cylinder generates 879N of push force and 528N of pull force at 0.5 MPa, making it well-suited for lighter load-holding tasks.
This model includes a magnetic piston (-S) for position detection with AirTAC CMSE reed or DMSE electronic solid-state sensors. The variable air cushion at the locker end is notably shorter (20mm) compared to the free end (27mm) to accommodate the locking mechanism. Furthermore, the lock is a static holding device that engages only after the rod has stopped; it is not a dynamic brake for a moving load.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X450S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X450S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 450 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 SAILF40X450S Is Used
Extended Lift Holding
Maintains a vertical lift in the rod-out position during a power loss, keeping the load safely suspended without continuous air supply.
Actuator Stop Gate
Locks a conveyor diverter gate at the extended stroke end to hold a flow path open securely until an air signal releases it.
Clamp and Hold
Extends to clamp a light workpiece and holds the pressure at the stroke terminal, preventing drift during machining operations.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X450S the Right Lock Cylinder?
Choose this 40mm bore cylinder when you need to secure a load at the fully extended position; if your application requires holding at the retracted rod-in position instead, select the SAILB variant. For applications demanding mid-stroke clamping at any arbitrary position, the BSAI clamp-lock cylinder is the correct choice rather than this stroke-end-only lock. When sizing for force, stepping up to a 50mm bore increases push thrust to 1374N at 0.7 MPa, while dropping below 40mm is not available in the SAIL series.
Because this model features a 450mm stroke, external guide rails should be used to prevent excessive side-loading on the rod and carbon steel piston. To ensure the lock functions safely, never use a fast-exhaust valve with this cylinder; always use an independent-exhaust solenoid valve, as back-pressure on the locker side can unintentionally release the lock. If human safety depends on the load staying extended, add an independent mechanical safety measure as well. Replacement parts must match the 40mm bore, 450mm stroke, front lock position, PT 1/4 port, and -S magnet specifications.
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 SAILF40X450S FAQ
At an operating pressure of 0.5 MPa, the 40mm bore generates 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end to hold the load statically. It unlocks automatically via air supply 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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