Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X800
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X800 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 800mm 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
- Stroke800 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 SAILF50X800
The AirTAC SAILF50X800 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This mechanism secures the rod specifically at the extended stroke end, retaining loads without requiring continuous live air pressure. Delivering a push force of 982N at 0.5 MPa, it utilizes a carbon steel rod and PT tapered port threads.
Because the lock engages statically after the piston stops, it functions purely as an end-of-stroke holding device rather than a dynamic brake for a moving rod. The variable air cushion at the locker end is notably shorter at 20mm compared to the 30mm cushion on the free end, a design detail required to accommodate the locking hardware. The lock releases automatically via air supply or manually via a lever.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X800 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X800 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 800 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 SAILF50X800 Is Used
Extended Load Holding
Secures vertical lifts in the extended position during a power loss, keeping the load safely elevated without relying on continuous air pressure.
Pallet Stop Gate
Acts as a rigid stop for pallets on a conveyor at the extended stroke end, holding the load firmly in place while indexing occurs.
Safety Guard Positioning
Maintains a safety guard or gate in the fully open extended position, requiring an intentional air release signal to unlock and close.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X800 the Right Lock Cylinder?
Choose this 50mm bore when an application requires 982N of push force at 0.5 MPa; step up to the 63mm bore if you need 1559N, or down to the 40mm bore for 628N loads. Select the SAILF front-locker variant to hold the rod in the extended position, and choose SAILB if the retracted position must be secured. If your process requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, utilize the BSAI clamp-lock cylinder instead.
For reliable operation, never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can inadvertently release the lock; an independent-exhaust solenoid valve is required. At 800mm of travel, side-load forces are amplified, so external guide rails must be used to prevent rod binding. Ensure replacement parts match the 50mm bore, 800mm stroke, front locker position, PT port, and mounting style. If human safety depends on the load remaining elevated, always add an independent mechanical safety measure.
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 SAILF50X800 FAQ
At 0.5 MPa operating pressure, the 50mm bore provides a push force of 982N and a pull force of 825N. At 0.7 MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, engaging statically to hold the rod only at the extended stroke end. It unlocks automatically when air is supplied to the release port or manually via a lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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