Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X80S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X80S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 80mm 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
- Stroke80 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 SAILF125X80S
The AirTAC SAILF125X80-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released mechanical lock housed in the front cover. Because the lock engages when the piston reaches the extended stroke end, it securely holds the rod-out position without requiring continuous live air pressure. In this configuration, the 125mm bore generates 6136N of push force and 5734N of pull force at 0.5 MPa, making it well-suited for heavy vertical load management.
This unit includes a magnetic piston (-S) compatible with AirTAC CMSE reed and DMSE solid-state sensors for precise end-of-stroke detection. A notable design trait is the shorter variable air cushion at the locker end (24mm) compared to the standard 40mm cushion on the rear cover, which accommodates the locking hardware. The lock itself releases automatically via air supply or manually via an override lever, and the carbon steel rod uses an M27x2 thread.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X80S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X80S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 80 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 SAILF125X80S Is Used
Overhead Lift Safety
Holds heavy extended loads securely in place during a sudden air pressure loss, preventing vertical drops on lifting machinery.
Press Clamp Hold
Maintains maximum extended clamping force on large workpieces without consuming continuous compressed air during machining cycles.
Gate Safety Lock
Secures heavy safety gates or machine guards in the fully open position until a deliberate air release signal is sent.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X80S the Right Lock Cylinder?
Select this 125mm bore when a 100mm bore (providing 3927N push at 0.5 MPa) lacks sufficient thrust, but a 160mm bore (10053N push) would be excessive overkill. Choose the SAILF configuration specifically when the application requires the load to be safely held at the extended rod-out position; if you need to hold the retracted position, the SAILB variant is required instead. For applications needing to clamp and hold the rod at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct choice.
Remember that this lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves with this cylinder; instead, use an independent-exhaust solenoid valve, as back-pressure on the locker side can unintentionally release the lock. If human safety depends on the load remaining extended, always add an independent safety measure. Replacement requires matching the 125mm bore, 80mm stroke, front lock position, PT tapered ports, and the -S magnet.
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 SAILF125X80S FAQ
At 0.5 MPa operating pressure, the 125mm bore provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf of push force.
The lock is spring-applied and air-released, engaging automatically when the rod reaches the extended stroke end to hold the load without live pressure. It unlocks by supplying air to the release port or by using the manual override lever. It provides static holding only and does not brake a moving rod.
Related AirTAC Lock & Standard Cylinders
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