Airtac SAILF Front Locking Pneumatic Cylinder SAILF200X125
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF200X125 is a genuine double-acting ISO 15552 profile cylinder with a Ø200mm bore, 125mm 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.
- BoreØ200 mm
- Stroke125 mm
- Port sizeG3/4
- Lock positionFront cover
- Rod threadM36×2
- 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 SAILF200X125
The AirTAC SAILF200X125 is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released mechanical lock housed in the front cover. This robust 200mm bore design delivers massive thrust, yielding 15708N push and 15080N pull at 0.5 MPa, scaling up to 28274N push at 0.9 MPa. Because the lock resides in the front end, it firmly secures the piston rod at the extended stroke-end position whenever the release air is cut, ensuring heavy loads remain safely held without relying on continuous live air pressure.
A key mechanical detail is that the variable air cushion at the locker end is physically shorter (28mm) compared to the free end cushion (50mm), a necessary accommodation for the locking mechanism. The cylinder operates at 30-500mm/s and uses a carbon steel rod with an M36x2 thread. To release the rod, you can supply air to the release port for automatic unlocking or use the manual release lever. Note that this is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF200X125 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF200X125 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø200 mm |
| Stroke | 125 mm |
| Acting type | Double acting, with lock |
| Port size | G3/4 |
| Rod thread | M36×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable (50 mm free end / 28 mm lock end) |
| Max stroke | Up to 1500 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 (Ø200mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 15708 N | 15080 N |
| 0.7 MPa | 21991 N | — |
| Max (@1.0 MPa) | 3204 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 SAILF200X125 Is Used
Heavy Lift Holding
Secures elevated platens or massive lifting platforms at the extended stroke end, preventing catastrophic drops if air pressure suddenly drops.
Safety Gate Lock
Maintains a positive mechanical lock on extended safety barriers or heavy gates during power loss, requiring air pressure to intentionally unlock and retract.
Press Load Retention
Holds substantial applied loads at the front stroke end in large pressing or clamping stations, retaining the position without consuming continuous pneumatic energy.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF200X125 the Right Lock Cylinder?
Choose this 200mm bore model when a system requires extreme force that smaller bores cannot provide; for context, stepping down to a 160mm bore drops the 0.5 MPa push force to 10053N. Select the SAILF configuration specifically when the application demands the load be held at the extended rod-out position. If your process instead requires clamping at the retracted position, a SAILB variant is needed. Alternatively, if you need to secure the load at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is the correct choice.
When integrating this cylinder, valve selection is a critical red-line: never use a fast-exhaust valve, and always utilize an independent-exhaust solenoid valve, as back-pressure on the locker side can inadvertently release the lock. If human safety depends on the load staying elevated, you must add an independent safety measure alongside the lock. For replacements, verify the 200mm bore, 125mm stroke, front locker position, 3/4 PT port, and mounting style (Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, TCM2). Although this stroke is 125mm, any application moving heavy 200mm bore loads should employ external guide rails to manage side-load forces.
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 SAILF200X125 FAQ
At 0.5 MPa, this 200mm bore cylinder provides 15708N of push force and 15080N of pull force. At 0.9 MPa, the push force increases to 28274N, with a maximum rated force of 3204 kgf at 1.0 MPa.
The lock is spring-applied and air-released, engaging only when the rod reaches the extended stroke end to provide a static hold without live pressure. It unlocks automatically via air supply or manually via a lever, but it cannot clamp at mid-stroke; for that, a BSAI cylinder is required.
Related AirTAC Lock & Standard Cylinders
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