Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150 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
About the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150
The AirTAC SAILF125X150 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock housed in the front cover. Because the lock is spring-applied and air-released, cutting the release air automatically drives the lock pin into the rod, securely holding the load at the fully extended stroke end without requiring live pressure. In the 125mm bore class, this actuator generates a substantial 6136N of push force and 5734N of pull force at 0.5 MPa, making it well-suited for heavy-duty positioning. The standard carbon steel rod provides excellent structural rigidity under high thrust loads.
A key mechanical detail is that the variable air cushion at the locker end is 24mm, which is intentionally shorter than the 40mm cushion found on the free end, ensuring the locking mechanism has the physical space needed to engage safely. Unlike a plain SAI cylinder that relies on constant air pressure to maintain a position, this SAILF variant ensures your load remains safely extended even during a complete pneumatic power loss. For position sensing, the barrel features dual-side sensor grooves compatible with AirTAC CMSE reed and DMSE solid-state electronic switches, though a magnet is not specified for this configuration.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150 |
|---|---|
| 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 SAILF125X150 Is Used
Overhead Lift Safety
Secures heavy vertical lifts in the extended position instantly upon pneumatic power loss, preventing gravity-driven falls until air is safely restored.
Heavy Press Hold
Maintains high-thrust clamping force at the extended stroke end during machining operations, eliminating the need for continuous system pressure.
Gate Actuation
Locks large industrial gates or heavy doors in the open, rod-out position to prevent unexpected movement during loading or maintenance access.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X150 the Right Lock Cylinder?
Select this 125mm bore model when an application demands high force combined with guaranteed load holding at the rod-out position; if your process requires holding at the retracted stroke end instead, choose the SAILB125X150 variant. Stepping down to an 80mm bore reduces the push force to 2513N at 0.5 MPa, while moving up to a 160mm bore increases it to 10053N. It is critical to understand that this lock engages strictly at the stroke terminal—it is a static holding device, not a dynamic brake for a moving rod. If your workflow requires clamping at an arbitrary mid-stroke position rather than the extended end, you must select a BSAI clamp-lock cylinder instead.
When integrating this actuator, never use a fast-exhaust valve, as rapid pressure drops can induce back-pressure on the locker side and inadvertently release the lock; always use an independent-exhaust solenoid valve. For any safety-critical lifting application where human safety depends on the load staying extended, add an independent mechanical safety measure alongside the cylinder. To match this exact replacement, verify the 150mm stroke, front locker position, PT tapered port threads, and your required mounting style from the available Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, or TCM2 options.
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 SAILF125X150 FAQ
At 0.5 MPa, the 125mm bore provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N, reaching a maximum push of 11045N at 0.9 MPa.
The lock is spring-applied and air-released, engaging automatically to hold the rod at the fully extended stroke end when release air is cut. It is a static hold only, not a mid-stroke clamp or dynamic brake; you can unlock it by supplying air to the release port or using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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