Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm 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.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- 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 SAILF50X300
The AirTAC SAILF50X300 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 to hold the rod securely at the extended stroke-end when release air is cut, preventing drops on power loss. Delivering 982N of push force at 0.5 MPa, it uses a 20mm carbon steel rod and a 1/4 PT port.
Unlike a plain SAI cylinder, this unit retains the load without live pressure, but strictly at the extended terminal, not at arbitrary mid-stroke points. The variable air cushion at the locker end is notably shorter (20mm versus 30mm at the free end) to accommodate the locking hardware. For position sensing, adding a -S magnet enables compatibility with CMSE reed and DMSE electronic sensors.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 300 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| 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 / 20 mm lock end) |
| Max stroke | Up to 1200 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SAILF50X300 Is Used
Vertical Lift Safety
Holds an extended vertical load securely in place during a compressed air failure, preventing sudden drops on lifting platforms.
Flow Stop Gate
Locks a diverter or gate open at the extended end without consuming continuous air pressure, ensuring stable material flow control.
Clamp and Hold
Maintains a clamping force at the end of the stroke on a machined part, saving energy while the tooling rests at the terminal.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X300 the Right Lock Cylinder?
Choose this 50mm bore when 628N from a 40mm bore is insufficient, or step up to a 63mm bore (1559N push at 0.5 MPa) if your payload exceeds 982N. Select the SAILF front-locker variant to secure loads at the extended rod-out position; conversely, pick SAILB to hold the retracted position. If your application requires clamping at an intermediate point, select the BSAI clamp-lock cylinder instead.
The lock is a static holding device that engages after the piston stops, not a dynamic brake for moving rods. Never use a fast-exhaust valve with this cylinder; an independent-exhaust solenoid valve is mandatory because back-pressure on the locker side can unintentionally release the lock. Add an independent mechanical safety measure for human safety. With a 300mm stroke, use a side-load guide to prevent rod binding. Replacement requires matching bore, stroke, front locker position, PT port, and mounting.
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 SAILF50X300 FAQ
At 0.5 MPa, the 50mm bore provides 982N of push force and 825N of pull force. At 0.7 MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end. It holds statically after stopping, not as a mid-stroke brake. Unlock by supplying release air or using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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