Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X125
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X125 is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm 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.
- BoreØ63 mm
- Stroke125 mm
- Port sizeG3/8
- Lock positionFront cover
- Rod threadM16×1.5
- 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 SAILF63X125
The AirTAC SAILF63X125 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, it automatically engages when the piston reaches the extended stroke end, securely holding a 1559N load at 0.5MPa without requiring continuous air pressure. You can release the rod using the automatic air supply or the manual override lever.
This unit includes a 3/8 PT port and a 20mm carbon steel rod. A key design detail is that the variable air cushion at the locker end is shorter at 21mm compared to the free end, ensuring precise deceleration before the static lock engages. It operates efficiently within a 30-800mm/s speed range.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X125 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X125 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 125 mm |
| Acting type | Double acting, with lock |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| 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 (30 mm free end / 21 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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 SAILF63X125 Is Used
Extended Load Holding
Maintains vertical lifts securely in the rod-out position during power loss, preventing sudden drops.
End-Stroke Clamping
Holds a workpiece firmly at the extended terminal without consuming continuous compressed air.
Gate Safety Stop
Keeps safety barriers and heavy gates locked open at the stroke end until the release air is supplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X125 the Right Lock Cylinder?
Choose this 63mm bore when an application requires holding a load safely at the rod-out position; if your mechanism demands locking at the retracted end, select the SAILB variant instead. Should your process require clamping at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct choice. If you need higher force, stepping up to the 80mm bore yields 2513N at 0.5MPa.
For safe operation, never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can unintentionally release the lock; always utilize an independent-exhaust solenoid valve. If human safety depends on the load remaining extended, add an independent safety measure. To replace this unit, match the 125mm stroke, front locker position, 3/8 PT port, and your required mounting from the ISO 15552 set.
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 SAILF63X125 FAQ
At 0.5 MPa operating pressure, this 63mm bore cylinder provides a push force of 1559N and a pull force of 1402N. At the maximum pressure of 1.0 MPa, it achieves a push force of 318 kgf.
The spring-applied, air-released lock engages statically when the rod reaches the extended stroke end. It holds the load without live pressure; you can unlock it automatically via the release air port or manually via the lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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