Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800S 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 SAILF40X800S
The AirTAC SAILF40X800-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because this is a SAILF variant, the spring-applied, air-released lock engages automatically when the piston reaches the fully extended stroke end, securely holding the rod-out position without requiring live air pressure. In the 40mm bore class, it generates 879N of push force and 528N of pull force at 0.7 MPa, utilizing a 16mm carbon steel rod with M12x1.25 threading. Equipped with a magnet (-S), it supports CMSE reed and DMSE solid-state sensors for precise end-position detection.
A critical mechanical detail is that the variable air cushion at the locker end measures 20mm, which is shorter than the 27mm cushion on the free end, ensuring compact lock integration. The lock is a static holding device that engages only after the cylinder stops; it is not a dynamic brake for a moving rod. If your application requires clamping at an arbitrary mid-stroke position rather than the extended end, the BSAI clamp-lock cylinder is the correct choice.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800S |
|---|---|
| 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 SAILF40X800S Is Used
Extended Vertical Lift Hold
Maintains a securely elevated position on vertical lifts when air pressure is removed, preventing gravity-driven collapses during power loss.
Overhead Conveyor Stop
Locks the rod out to act as a rigid physical stop for overhead conveyor items, holding the load firmly at the extended stroke terminal.
Safety Gate Barrier
Secures a safety barrier or gate in the open, extended position without relying on continuous air pressure, ensuring fail-safe operation.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X800S the Right Lock Cylinder?
Select this 40mm bore lock cylinder when an application demands secure load holding at the fully extended rod-out position, particularly in long-stroke vertical lift setups. If your force requirements are higher, stepping up to the 50mm bore yields 1374N of push force at 0.7 MPa. Conversely, if you need to hold the load at the retracted rod-in position, the SAILB40 variant is the appropriate selection. For this 800mm stroke, adding external linear guides is strongly recommended to prevent excessive side-load wear on the rod and cylinder seals.
When integrating this model, avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. The lock holds the load statically at the stroke end, but if human safety depends on the load remaining elevated, always add an independent mechanical safety measure. Replacement specifications must match the 40mm bore, 800mm stroke, front lock position, PT tapered 1/4 port, and -S magnet.
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 SAILF40X800S FAQ
At 0.7 MPa, this 40mm bore cylinder provides 879N of push force and 528N of pull force. It can achieve a maximum push force of 1130N at 0.9 MPa.
The lock is spring-applied and air-released, engaging statically only when the piston reaches the fully extended stroke end. It does not clamp at mid-stroke. Unlocking is achieved automatically by supplying release air to the port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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