Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25S is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm bore, 25mm 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
- Stroke25 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 SAILF63X25S
The AirTAC SAILF63X25-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, it automatically engages a lock pin to hold the rod securely at the extended stroke-end whenever release air is cut. This guarantees load retention during power loss without relying on live air pressure. Delivering 1559N of push force at 0.5MPa, it integrates a carbon steel rod and a magnetic piston for precise position sensing.
Unlike a plain SAI cylinder, this SAILF variant ensures static holding at the rod-out terminal. The variable air cushion at the locker end is notably shorter at 21mm compared to the 30mm cushion on the free end, ensuring compact end-of-stroke deceleration without interfering with the lock mechanism. For pneumatic control, avoid fast-exhaust valves; an independent-exhaust solenoid valve is required because back-pressure on the locker side can unintentionally release the lock.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 25 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 SAILF63X25S Is Used
Extended Load Holding
Secures vertical lifts and elevated platforms in the rod-out position, preventing gravity-induced drops during a pneumatic pressure loss.
Power-Off Safety Clamp
Maintains a mechanical grip on pushed-out tooling or workpieces when the air supply is shut off, ensuring the assembly remains safely locked.
End-Stroke Gate Hold
Keeps heavy safety gates or machine guards firmly open at the full extension point without continuously consuming compressed air.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25S the Right Lock Cylinder?
Choose this 63mm bore for medium-force applications requiring 1559N push or 1402N pull force at 0.5MPa. If your project demands less force, a 50mm bore provides 982N push, while stepping up to an 80mm bore yields 2513N. Select this SAILF front-locker model when the load must be held at the extended position; choose SAILB if you need to secure the retracted position. If your application requires clamping at an arbitrary mid-stroke point rather than a stroke-end hold, use the BSAI clamp-lock cylinder instead.
For safe implementation, remember the lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Critical loads suspended in the air require an independent mechanical safety measure. Replacement requires matching the 63mm bore, 25mm stroke, front locker position, 3/8 PT port, and the -S magnet for CMSE reed and DMSE electronic sensors.
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 SAILF63X25S FAQ
At 0.5MPa, this 63mm bore cylinder provides 1559N of push force and 1402N of pull force. If operating at 0.7MPa, the push force increases to 2182N.
The lock is spring-applied and air-released, engaging automatically to hold the rod only at the extended stroke end when release air is cut. You can unlock it by supplying air to the release port or using the manual lever. It provides a static hold after stopping, not a mid-stroke clamp.
Related AirTAC Lock & Standard Cylinders
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