Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X50S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF40X50S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 50mm 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
- Stroke50 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 SAILF40X50S
The AirTAC SAILF40X50-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because it is a front-locker (SAILF), the spring-applied, air-released lock engages precisely when the piston reaches the extended stroke end, securely holding the rod-out position without requiring continuous live air. In the 40mm bore class, it generates 628N of push thrust and 528N of pull thrust at 0.5 MPa, making it well-suited for compact actuation tasks. This unit includes a standard magnet for position sensing.
A key mechanical detail is that the variable air cushion at the locker end is notably shorter than at the free end (20mm versus 27mm), a deliberate design choice to accommodate the locking mechanism without compromising end-of-stroke deceleration. The lock releases automatically by supplying air to the release port, or manually via the override lever. For accurate end-of-stroke detection, the integrated magnet works seamlessly with AirTAC CMSE reed switches and DMSE solid-state electronic sensors.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X50S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X50S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 50 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 SAILF40X50S Is Used
Vertical Lift Safety
Holds an extended vertical load securely in place during a sudden power or air loss, preventing accidental gravity-driven drops.
End-of-Stroke Clamp
Maintains constant clamping pressure on a workpiece at the fully extended position without consuming continuous pneumatic energy.
Gate and Guard Hold
Keeps safety gates, machine guards, or heavy doors reliably open at the end of the stroke until the release air is actively supplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X50S the Right Lock Cylinder?
Select this 40mm bore model when your application requires a reliable hold at the extended rod-out position; if you need to hold the retracted position, choose the SAILB counterpart instead. If your load demands greater clamping force, stepping up to the 50mm bore yields 982N of push thrust at 0.5 MPa. Conversely, if you need to arrest and hold a load at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is the correct choice over this SAIL series.
Remember that the SAIL lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Valve selection is critical: never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can inadvertently release the lock; always use an independent-exhaust solenoid valve. If human safety depends on the load staying extended, add an independent safety measure. To match this exact unit for replacement, verify: 40mm bore, 50mm stroke, front locker position (F), PT tapered port threads, and the -S magnet option.
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 SAILF40X50S FAQ
At 0.5 MPa, this 40mm bore cylinder generates 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N. The maximum operating pressure is 1.0 MPa.
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 mid-stroke clamp. To unlock it, you supply air to the release port for automatic release, or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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