Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X80S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF40X80S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 80mm 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
- Stroke80 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 SAILF40X80S
The AirTAC SAILF40X80-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because the lock is spring-applied and air-released, cutting the release air drives a lock pin into the rod, securely holding the load at the extended stroke end without relying on live pressure. In the 40mm bore class, it delivers 879N of push force at 0.7MPa and includes a magnetic piston (-S) for electronic DMSE or reed CMSE position sensing.
Unlike a plain SAI cylinder, this model provides true power-loss safety, but it is strictly a static holding device that engages after the piston stops, not a dynamic brake. The variable air cushion at the front locker end is notably shorter at 20mm compared to the 27mm cushion on the free back end. Furthermore, you must avoid fast-exhaust valves and use an independent-exhaust solenoid valve, as back-pressure on the locker side can unintentionally release the lock.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X80S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X80S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 80 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 SAILF40X80S Is Used
Extended Lift Holding
Maintains a vertically elevated load at the extended stroke end during air pressure loss, preventing sudden drops on lifting jigs.
Clamp and Hold
Secures a workpiece in the extended position without consuming continuous compressed air, saving energy during machining cycles.
Gate Safety Locking
Keeps safety gates and heavy guards open at the rod-out terminal position until a controlled air signal releases the pin.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X80S the Right Lock Cylinder?
Choose this 40mm bore cylinder when an application requires maintaining an extended position during a power loss, delivering 628N push at 0.5MPa or 879N at 0.7MPa. If your machine requires higher clamping or lifting force, stepping up to the 50mm bore provides 1374N at 0.7MPa. Select this SAILF variant specifically because the load must be held at the rod-out stroke end; if you need to hold the retracted position, choose the SAILB instead. For applications requiring mid-stroke clamping at arbitrary positions, the BSAI clamp-lock cylinder is the correct choice over this stroke-end-only lock.
When replacing this unit, match the 40mm bore, 80mm stroke, front locker position, PT tapered port threads, and the -S magnet option. The carbon steel rod handles standard side loads, and the extruded aluminum barrel accepts the full range of ISO 15552 mounting interfaces including Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, and TCM2. Always confirm from the datasheet if human safety depends on the load staying elevated, as an independent mechanical safety measure is required in addition to the lock.
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 SAILF40X80S FAQ
The 40mm bore generates 628N of push force and 528N of pull force at 0.5MPa. At 0.7MPa, the push force is 879N, increasing to 1130N at 0.9MPa.
The lock is spring-applied and air-released, engaging only at the extended stroke end in the front cover. It holds the load statically after the rod stops; it is not a mid-stroke clamp or dynamic brake. Unlocking occurs automatically via air pressure or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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