Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 175mm 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
- Stroke175 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 SAILF40X175S
The AirTAC SAILF40X175-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This lock engages automatically when the piston reaches the extended stroke end, securing the load without relying on live air pressure. In the 40mm bore class, it generates 628N of push force and 528N of pull force at 0.5 MPa, utilizing a 16mm carbon steel rod. Equipped with a magnet (-S), it supports position sensing via AirTAC CMSE reed and DMSE electronic switches.
A key design trait is the variable air cushioning: the front locker-end cushion is notably shorter at 20mm compared to the 27mm cushion on the free end. The lock releases automatically by supplying air to the release port, or manually via the override lever. Remember the lock is a static holding device for use after the rod stops, not a dynamic brake for a moving load.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 175 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 SAILF40X175S Is Used
Extended Load Holding
Secures vertical lifts in the extended position during a power loss, preventing gravity-induced drops without needing continuous air pressure.
End-of-Stroke Stop
Maintains a fixed extended position for conveyor sorting gates or diverter arms, locking instantly upon reaching the front stroke terminal.
Safety Gate Hold
Keeps machine access gates firmly open and locked at the extended end, requiring an intentional air release signal to close.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X175S the Right Lock Cylinder?
Select this 40mm bore model when an application requires safely holding a load at the fully extended position; choose a SAILB variant instead if the retracted position must be held. If your mechanism requires clamping at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is the correct choice. Stepping up to a 50mm bore increases the 0.5 MPa push force to 982N, while dropping below 40mm is not available in the SAIL series.
For safe operation, avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; use an independent-exhaust solenoid valve instead. If human safety depends on the load remaining extended, add an independent mechanical safety measure. This configuration features PT tapered ports, a 1/4 thread, and standard ISO 15552 mounting options including FA, FB, LB, and TC. With a 175mm stroke, ensure adequate side-load guidance to prevent rod binding.
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 SAILF40X175S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 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 rod reaches the fully extended stroke end. It holds the load statically without live pressure. To unlock, 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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