Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25 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 SAILF63X25
The AirTAC SAILF63X25 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because it is a SAILF variant, the spring-applied, air-released lock engages only when the piston reaches the extended stroke end, securely holding the rod-out position. With a 63mm bore, it generates 1559N of push force and 1402N of pull force at 0.5 MPa, making it well-suited for medium-duty holding tasks.
This model uses a carbon steel rod and PT tapered port threads. The variable air cushion at the locker end is 21mm, which is intentionally shorter than the 30mm cushion on the non-locking end. The lock itself is a static holding device that engages after the cylinder stops; it is not a dynamic brake for a moving rod. For position detection, adding a magnet (-S) allows the use of AirTAC CMSE reed or DMSE electronic solid-state sensors.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25 |
|---|---|
| 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 SAILF63X25 Is Used
Extended Load Holding
Maintains a vertically lifted load securely at the extended stroke end during a power loss, relying on the mechanical lock rather than continuous air pressure.
Clamp and Secure
Holds a workpiece firmly at the rod-out position for machining or inspection, ensuring the part remains fixed without consuming compressed air.
Gate Safety Stop
Prevents a heavy guard or gate from dropping accidentally when extended, engaging automatically if the air supply is cut off.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X25 the Right Lock Cylinder?
Select this 63mm bore model when an application requires holding a load at the fully extended stroke end without maintaining live air pressure, as the spring-applied lock engages automatically upon pressure loss. If your process requires holding at the retracted position, the SAILB63X25 is the correct alternative. Should you need to freeze the rod at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is the required choice instead of this stroke-end lock.
When sizing force, stepping down to a 50mm bore yields 982N push at 0.5 MPa, while stepping up to an 80mm bore provides 2513N. Crucially, avoid using fast-exhaust valves with this cylinder; an independent-exhaust solenoid valve is mandatory because back-pressure on the locker side can unintentionally release the lock. If human safety depends on the load remaining extended, always add an independent safety measure. Replacement matches require 63mm bore, 25mm stroke, front locker, PT ports, and standard mountings like FA, FB, or TC.
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 SAILF63X25 FAQ
At 0.5 MPa operating pressure, the 63mm bore provides 1559N of push force and 1402N of pull force. At the maximum 1.0 MPa, it achieves a push force of 318 kgf.
The lock is spring-applied and air-released, engaging statically only when the piston reaches the extended stroke end. It does not clamp mid-stroke. You can unlock it automatically by supplying air to the release port, or manually via the release lever.
Related AirTAC Lock & Standard Cylinders
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