Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900 is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 900mm 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
- Stroke900 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 SAILF40X900
The AirTAC SAILF40X900 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 when the piston reaches the extended stroke end, securely holding the rod out without requiring live pressure. With a 40mm bore, it delivers 879N of push force at 0.7 MPa. The standard carbon steel rod provides durable service, and the PT tapered threads ensure tight pneumatic connections.
A key design feature is the variable air cushion, which is notably shorter on the locker end (20mm) compared to the free end (27mm) to accommodate the locking mechanism. This model carries a non-standard 900mm stroke, exceeding the 40mm bore maximum standard stroke of 1200mm. The lock is a static holding device that engages after the cylinder stops; it is not a dynamic brake for a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 900 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 SAILF40X900 Is Used
Extended Lift Hold
Holds a vertical lift safely in the extended position during a sudden air pressure loss.
Out-Stroke Clamp
Maintains clamping pressure on a part at the end of the stroke without consuming air.
Gate Safety Stop
Secures an extended safety gate in place until the release air is actively supplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X900 the Right Lock Cylinder?
Choose this SAILF40X900 when your application requires the load to be held securely at the extended stroke end on power loss. If you need higher clamping force, stepping up to the 50mm bore yields 1374N of push force at 0.7 MPa. If your mechanism must lock at an arbitrary mid-stroke position rather than the stroke terminal, select the BSAI clamp-lock cylinder instead. To match this unit for replacement, verify the 40mm bore, 900mm stroke, front locker position, PT port threads, and mounting style.
Because this model uses a 900mm stroke, adding an external guide rail is highly recommended to prevent excessive side-load wear on the rod and barrel seals. For valve selection, avoid fast-exhaust valves; 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 remaining extended, always add an independent mechanical safety measure.
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 SAILF40X900 FAQ
The 40mm bore provides 628N of push force at 0.5 MPa and 879N at 0.7 MPa. The pull force is 528N at 0.5 MPa. Maximum operating pressure is 1.0 MPa.
The lock is spring-applied and air-released, located in the front cover. It holds the rod statically only at the extended stroke end after the cylinder stops. It is unlocked automatically by supplying release air or manually via the release lever.
Related AirTAC Lock & Standard Cylinders
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