Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X500S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X500S is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 500mm 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
- Stroke500 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 SAILF50X500S
The AirTAC SAILF50X500-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock housed in the front cover. Because it is a front-locker (SAILF), the spring-applied, air-released mechanism engages when the piston reaches the extended stroke end, securely holding the rod out without requiring live air pressure. With a 50mm bore, it delivers 982N of push thrust and 825N of pull thrust at 0.5 MPa. The carbon steel rod provides durable service, and the integrated -S magnet enables precise position sensing using AirTAC CMSE reed switches or DMSE solid-state electronic sensors.
This model features a 500mm stroke and PT tapered port threads. A distinct mechanical characteristic of this series is that the variable air cushion at the locker end is physically shorter than the cushion on the free end. The lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. To release the lock, you can supply air to the release port for automatic operation or use the manual override lever.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X500S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X500S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 500 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 SAILF50X500S Is Used
Vertical Lift Safety
Holds a lifted load securely at the extended stroke end during a power loss, preventing sudden drops until air is restored to the release port.
Pallet Stop Arm
Extends 500mm to halt heavy pallets on a line, maintaining the extended position without live air pressure to conserve energy between cycles.
Gate Actuation
Secures heavy industrial gates in the open position using the front cover lock, requiring an intentional air signal or manual lever release to close.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X500S the Right Lock Cylinder?
Choose this 50mm bore cylinder when you need to hold a load securely at the extended stroke end without consuming continuous air pressure. If your application requires less force, the 40mm bore offers 528N of pull thrust at 0.5 MPa; if you need substantially more holding capability, stepping up to the 63mm bore provides 1402N of pull force. For applications where the load must be clamped at an arbitrary mid-stroke position rather than at the extended end, the AirTAC BSAI clamp-lock cylinder is the correct choice. If human safety depends on the load remaining extended, always add an independent mechanical safety measure alongside the lock.
When matching this cylinder for a replacement, verify the 50mm bore, 500mm stroke, front locker position, 1/4 PT port threads, and the -S magnet option. Because this model has a 500mm stroke, it is highly recommended to use external guide rails to prevent excessive side-load moments from damaging the rod seals and front cover lock mechanism. Furthermore, avoid using fast-exhaust valves with this cylinder; always use an independent-exhaust solenoid valve, as back-pressure on the locker side can inadvertently release the spring-applied 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 SAILF50X500S FAQ
At 0.5 MPa operating pressure, the 50mm bore provides 982N of push thrust and 825N of pull thrust. At 0.7 MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, engaging only when the rod reaches the extended stroke end. It provides a static hold after the cylinder stops, not a dynamic brake. Unlocking is done automatically by supplying air to the release port or manually via the override lever.
Related AirTAC Lock & Standard Cylinders
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