Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X500S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X500S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm 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.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Lock positionFront cover
- Rod threadM27×2
- 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 SAILF125X500S
The AirTAC SAILF125X500-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock housed in the front cover. Because it is an F-series unit, the spring-applied, air-released lock engages when the piston reaches the extended stroke end, securely holding the rod-out position without requiring live pressure. In the 125mm bore class, it generates 6136N of push force and 5734N of pull force at 0.5MPa, making it well-suited for heavy vertical lifting tasks. A standard carbon steel rod handles side loads, and the included -S magnet supports position sensing via CMSE reed or DMSE solid-state switches.
This model uses a 1/2-inch PT port and operates at speeds between 30-500mm/s. The variable air cushion at the locker end measures 24mm, which is intentionally shorter than the 40mm cushion found on the free end. This cylinder provides automatic air unlocking and a manual release lever for operational flexibility during power loss.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X500S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X500S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 500 mm |
| Acting type | Double acting, with lock |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable (40 mm free end / 24 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 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 SAILF125X500S Is Used
Vertical Lift Holding
Secures heavy elevated platforms at the extended stroke end, preventing sudden drops during power loss or air pressure failure.
Safety Gate Lock
Maintains a protective barrier in the open position by mechanically locking the rod out until the release air is restored.
Clamp and Hold
Keeps a heavy workpiece clamped at the end of the stroke without consuming continuous compressed air.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X500S the Right Lock Cylinder?
Select this 125mm bore when a 100mm bore (providing 3927N push at 0.5MPa) lacks the thrust to safely elevate a heavy load, but a 160mm bore (delivering 10053N) would be excessive overkill. The SAILF configuration is specifically chosen when the application requires the load to be safely parked at the fully extended rod-out position; conversely, a SAILB variant holds the retracted position. If your machinery needs to freeze the rod at an arbitrary mid-stroke point rather than at a stroke terminal, you must select a BSAI clamp-lock cylinder instead, as the SAIL lock only engages at the stroke end.
Remember that this lock is a static holding device, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves with this cylinder; always select an independent-exhaust solenoid valve, because back-pressure on the locker side can inadvertently release the lock. For safety-critical lifting applications where human safety depends on the load remaining elevated, always add an independent secondary safety measure. With a 500mm stroke, ensure external load guides are used to prevent excessive side-load wear on the rod seals. Replacement units must match the 125mm bore, 500mm stroke, front locker position, PT port, and -S magnet specification.
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 SAILF125X500S FAQ
At 0.5MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7MPa, the push force increases to 8590N.
The lock is spring-applied and air-released, engaging only when the piston reaches the fully extended stroke end in the front cover. It provides a static hold, not a dynamic brake. To unlock, supply air to the release port or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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