Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X300S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X300S is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm bore, 300mm 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
- Stroke300 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 SAILF63X300S
The AirTAC SAILF63X300-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, cutting the release air drives a lock pin into the rod, securely holding the load at the extended stroke end without requiring live pressure. In this 63mm bore class, the cylinder delivers a robust 2805N of push force at 0.9 MPa, making it highly capable of managing heavy vertical loads during power loss.
This model includes a magnetic piston (-S) for use with CMSE reed and DMSE electronic solid-state sensors. A key design detail is that the variable air cushion at the locker end is shorter (21mm) compared to the free end (30mm) to accommodate the locking hardware. The lock engages only 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 SAILF63X300S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X300S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 300 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 SAILF63X300S Is Used
Vertical Lift Safety
Secures elevated platforms or heavy doors in the extended position instantly upon air pressure loss, preventing accidental crashes.
Pallet Arrestor
Holds a stopped pallet firmly at the extended end-of-stroke terminal during a power outage to maintain line sequencing.
Overhead Clamp Hold
Maintains outward clamping pressure on a workpiece without consuming continuous air supply once the rod reaches its extended stop.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF63X300S the Right Lock Cylinder?
Choose this 63mm bore when a 50mm bore (offering 1767N push at 0.9 MPa) lacks the necessary force to hold your load, but a larger 80mm bore (providing 4523N) would be excessive. The SAILF variant is specifically selected when the application demands the load be safely secured at the extended rod-out position, whereas a SAILB version holds at the retracted end. If your process requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, select the BSAI clamp-lock cylinder instead.
For reliable operation, never pair this cylinder with a fast-exhaust valve, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. This 300mm stroke exceeds the 150mm threshold where side-loading becomes a concern, so proper guiding of the load is essential. To replace this unit, match the 63mm bore, 300mm stroke, front locker position, PT port threads, and the -S magnet. Always add an independent mechanical safety measure if human safety depends on the load remaining elevated.
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 SAILF63X300S FAQ
At the maximum operating pressure of 0.9 MPa, this 63mm bore cylinder generates 2805N of push force and 2182N at 0.7 MPa.
The lock is spring-applied and air-released. It engages automatically when the rod reaches the extended stroke end, holding the load statically without live pressure. To unlock, supply air to the release port or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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