Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250S is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm bore, 250mm 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
- Stroke250 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 SAILF63X250S
The AirTAC SAILF63X250-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 secures the rod at the fully extended stroke end whenever the release air is cut. This guarantees load-holding safety on power loss, a capability a standard SAI unit lacks. Equipped with a magnet, it integrates seamlessly with CMSE reed and DMSE electronic solid-state sensors.
Delivering 1559N of push force at 0.5MPa and 1402N of pull force, this 63mm bore unit utilizes a 3/8 PT port and a 20mm carbon steel rod with an M16x1.5 thread. The variable air cushion at the locker end is notably shorter at 21mm compared to the 30mm cushion on the free end. Remember that the lock only engages after the piston stops at the stroke terminal; it is a static holding device, not a dynamic brake for a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 250 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 SAILF63X250S Is Used
Extended Lift Holding
Secures vertical lifts in the rod-out position during air pressure loss, preventing sudden drops.
Clamp-and-Hold at Stroke End
Maintains positive holding force on extended workpieces without consuming continuous live air pressure.
Gate Safety Barrier
Keeps safety gates and barriers locked open at the extended stroke terminal until actively released.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X250S the Right Lock Cylinder?
Select this 63mm bore if your application demands 1559N push at 0.5MPa; if you require less force, the 50mm bore offers 982N, while stepping up to the 80mm bore yields 2513N. Choose this SAILF configuration specifically when the load must be held securely at the rod-out position. If your workflow requires clamping at an arbitrary mid-stroke point rather than the extended end, the BSAI clamp-lock cylinder is the correct alternative. For safety-critical suspended loads, always add an independent mechanical safety measure alongside the lock.
When replacing this unit, verify the 250mm stroke, front locker position, 3/8 PT port, and the -S magnet for sensor compatibility. Because the stroke is 250mm, ensure adequate side-load support by utilizing external linear guides to prevent rod binding. Furthermore, never use a fast-exhaust valve with this cylinder; always install an independent-exhaust solenoid valve, as back-pressure on the locker side can inadvertently release 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 SAILF63X250S FAQ
At 0.5MPa, this 63mm bore cylinder provides 1559N of push force and 1402N of pull force. At 0.7MPa, the push force increases to 2182N.
The lock is spring-applied and air-released, engaging only when the piston reaches the fully extended stroke end. It holds statically after stopping and is unlocked by supplying release air or using the manual override lever.
Related AirTAC Lock & Standard Cylinders
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