Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X350S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X350S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 350mm 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
- Stroke350 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 SAILF40X350S
The AirTAC SAILF40X350-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover, designed to hold the rod securely at the extended stroke end. A spring-applied, air-released locking pin engages automatically when the piston reaches the front terminal, ensuring vertical or horizontal loads remain safely held without requiring continuous live air pressure. In the 40mm bore class, it delivers a 0.7MPa push thrust of 879N and a pull thrust of 825N, making it well-suited for medium-load positioning tasks.
This model includes a magnetic piston (-S) for direct compatibility with AirTAC CMSE reed and DMSE solid-state sensors, enabling precise end-of-stroke detection. Because the lock occupies the front end, the variable air cushion on that side is shorter (20mm) compared to the standard 27mm cushion on the rear free end. For safe operation, avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; an independent-exhaust solenoid valve is required instead.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X350S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X350S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 350 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 SAILF40X350S Is Used
Extended Load Holding
Maintains an elevated platform safely in the extended position using the spring-applied front lock, preventing sudden drops during a compressed air or power loss.
Flow Control Diverter
Keeps a conveyor routing gate fully pushed out and locked without consuming continuous air, ensuring stable product flow diversion during long machine cycles.
Safety Gate Barrier
Secures a protective machine guard in the open, extended stroke end to safely isolate hazardous zones during maintenance until manual or air release is applied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X350S the Right Lock Cylinder?
Select this 40mm bore SAILF model when an application demands fail-safe load holding specifically at the fully extended position. If your process requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, the BSAI clamp-lock cylinder is the correct alternative. Stepping up to the 50mm bore increases the 0.5MPa push force to 982N for heavier payloads, while dropping to a smaller bore is not available as SAIL starts at 40mm.
With a 350mm stroke, the extended rod is highly susceptible to bending under lateral loads, so external linear guides must be used to prevent side-load damage. The lock provides a static hold that engages only after the cylinder has stopped; it is not a dynamic brake. Always confirm the exact lock holding-force from the datasheet for your specific payload, and if human safety depends on the load remaining extended, add an independent mechanical safety measure. Replacement specifications: 40mm bore, 350mm stroke, front locker, PT port threads, and a magnetic piston.
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 SAILF40X350S FAQ
At a 0.5MPa operating pressure, the 40mm bore provides 628N of push thrust and 528N of pull thrust. At 0.7MPa, the push thrust increases to 879N and the pull thrust to 825N.
The lock is spring-applied and air-released, engaging automatically when the piston reaches the extended stroke end in the front cover. It provides a static hold only, not a mid-stroke clamp. To unlock, you supply air to the release port or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X350S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.