Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X75S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X75S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 75mm 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
- Stroke75 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 SAILF125X75S
The AirTAC SAILF125X75-S is a double-acting ISO 15552 profile cylinder equipped with a built-in mechanical lock in the front cover. Because the lock is spring-applied and air-released, it safely holds the rod at the extended stroke end without requiring continuous live air pressure. In the event of a pressure drop, the mechanism engages automatically, and you can unlock it by supplying release air or using the manual override lever. Generating 8590N of push force at 0.7MPa, this unit is dimensionally interchangeable with ISO 15552 cylinders while adding critical power-failure safety.
This model includes a magnetic piston for position detection, compatible with AirTAC CMSE reed and DMSE solid-state sensors. The variable air cushion at the front locker end measures 24mm, which is intentionally shorter than the 40mm cushion on the free end to accommodate the locking hardware. The standard carbon steel rod handles substantial axial loads, and the 1/2-inch PT port ensures high flow rates for rapid cycling within the 30-500mm/s speed range.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X75S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X75S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAILF125X75S Is Used
Vertical Lift Holding
Maintains an elevated load in the extended position automatically during power loss, preventing sudden drops until release air is restored.
Diverter Gate Safety
Keeps a heavy routing gate locked open at the stroke end without consuming continuous air, ensuring stable flow control.
Press Safety Barrier
Holds a protective barrier open at full extension, relying on the spring-applied lock to remain secure even if the main air supply is disconnected.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X75S the Right Lock Cylinder?
Choose this 125mm bore when substantial thrust is required to move a load out and hold it securely in the extended position, offering 6136N push at 0.5MPa. If your application requires less force, stepping down to an 80mm bore yields 3518N at 0.7MPa, whereas a 160mm bore provides 14074N for heavier mechanisms. Select the SAILF front-locker configuration when the extended rod-out state is the safe resting position; conversely, pick SAILB if the load must be held retracted. If your process needs to freeze the piston at an arbitrary mid-stroke point rather than at the end, you must use a BSAI clamp-lock cylinder instead.
Remember that this lock is a static holding device that engages only after the cylinder stops, not a dynamic brake for a moving rod. Valve selection is critical: never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can unintentionally release the lock. Always utilize an independent-exhaust solenoid valve, and if human safety depends on the load staying extended, implement an additional independent safety measure. For replacements, verify the 125mm bore, 75mm stroke, front locker position, 1/2-inch PT port, and the -S magnet requirement.
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 SAILF125X75S FAQ
The 125mm bore generates 6136N of push force at 0.5MPa and 8590N at 0.7MPa. The pull force is 5734N at 0.5MPa and 8590N at 0.7MPa, with a maximum operating pressure of 1.0MPa.
The spring-applied, air-released lock engages only when the piston reaches the extended stroke end in the front cover. It provides a static hold, not mid-stroke clamping, and can be released automatically via air pressure or manually via the lever.
Related AirTAC Lock & Standard Cylinders
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