Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X400
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X400 is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm bore, 400mm 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
- Stroke400 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 SAILF63X400
The AirTAC SAILF63X400 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This mechanism engages automatically when the piston reaches the extended stroke end, ensuring your load is held securely without requiring continuous live air pressure. With a 63mm bore, it delivers 1559N of push thrust and 1402N of pull thrust at 0.5MPa, making it well-suited for medium-force vertical holding tasks.
A key mechanical detail is that the variable air cushion at the locker end is 21mm, intentionally shorter than the 30mm cushion on the free end to accommodate the locking hardware. Because the lock is static and engages only after the cylinder stops, it cannot clamp a moving rod at an arbitrary mid-stroke point. For mid-stroke holding, the BSAI clamp-lock series is required instead.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X400 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X400 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 400 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 SAILF63X400 Is Used
Vertical Load Holding
Secures elevated loads in the extended position automatically upon air pressure loss, preventing sudden drops in lifting rigs.
Pallet Stopper Arm
Locks the extended stopper arm firmly in place to hold heavy pallets on a conveyor line without consuming continuous air.
Press Clamping Hold
Maintains outward clamping pressure on a workpiece at the stroke end, retaining the part securely during secondary machining.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X400 the Right Lock Cylinder?
Choose this 63mm bore if your application requires around 1559N of push force at 0.5MPa; stepping up to an 80mm bore provides 2513N, while dropping to a 50mm bore offers 982N. Select the SAILF configuration when the load must be secured in the extended rod-out position, and choose SAILB if the retracted position needs holding. Since this is a 400mm stroke, ensure external guide rails are used to prevent excessive side-load wear on the rod and seals.
For safe operation, never use a fast-exhaust valve with this lock cylinder; an independent-exhaust solenoid valve is required because back-pressure on the locker side can unintentionally release the lock. Always add an independent mechanical safety measure if human safety depends on the load remaining extended. Replacement units must match the 63mm bore, 400mm stroke, front locker position, 3/8 PT port, and standard carbon steel rod.
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 SAILF63X400 FAQ
At 0.5MPa, the 63mm bore 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 statically only when the piston reaches the extended stroke end. It unlocks automatically via air supply to the release port or manually via the lever; it does not clamp mid-stroke.
Related AirTAC Lock & Standard Cylinders
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