Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X150S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 150mm 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
- Stroke150 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 SAILF125X150S
The AirTAC SAILF125X150-S is a double-acting ISO 15552 profile cylinder equipped with a built-in mechanical lock inside the front cover. Because the lock is spring-applied and air-released, cutting the release air drives a lock pin into the rod, securely holding the load at the extended stroke end without consuming live pressure. This 125mm bore generates 6136N of push force at 0.5 MPa and includes a magnetic piston for position sensing.
Unlike a plain SAI cylinder, this model provides true power-failure safety, though the lock engages only at the stroke terminal, not at arbitrary mid-stroke positions. The variable air cushion at the locker end measures 24mm, intentionally shorter than the 40mm cushion on the free end to accommodate the locking hardware. For automated detection, the integrated magnet works seamlessly with AirTAC CMSE reed switches and DMSE solid-state sensors.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAILF125X150S Is Used
Extended Lift Holding
Maintains a vertical lift in the extended position during a power loss, using the spring-applied front lock to prevent sudden drops.
Pallet Stopper
Locks the rod out at the stroke end to halt heavy pallet traffic securely without relying on continuous air pressure.
Safety Gate Barrier
Holds a protective barrier open at full extension, engaging the mechanical lock automatically if the air supply is cut off.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150S the Right Lock Cylinder?
Choose this 125mm bore when an application requires 6136N push force at 0.5 MPa; if you need less holding capacity, the 100mm bore offers 3927N, or step up to the 160mm bore for 10053N. Select the SAILF configuration specifically when the load must be held in the extended rod-out position, whereas SAILB holds the retracted position. If your process requires clamping at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct choice.
Remember that this is a static holding lock that engages after the cylinder stops, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves with this cylinder; instead, specify an independent-exhaust solenoid valve, as back-pressure on the locker side can inadvertently release the lock. For any application where human safety depends on the load remaining extended, always add an independent safety measure. Replacement matches require the exact 125mm bore, 150mm stroke, front locker position, PT port threads, and the -S magnet option.
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 SAILF125X150S FAQ
The 125mm bore generates 6136N of push force and 5734N of pull force at 0.5 MPa. At 0.7 MPa, the push force increases to 8590N, and it reaches 11045N at 0.9 MPa.
The lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end in the front cover. It provides a static hold after the rod stops, not a dynamic brake, and can be unlocked automatically via air or manually via a lever.
Related AirTAC Lock & Standard Cylinders
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