Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900S
The AirTAC SAILF Front Locking Pneumatic Cylinder SAILF125X900S is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 900mm 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
- Stroke900 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 SAILF125X900S
The AirTAC SAILF125X900-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. Because it is a front-locker (SAILF), the spring-applied, air-released lock engages automatically when the piston reaches the extended stroke end. It delivers 8590N of push force at 0.7MPa, making it suitable for heavy linear actuation tasks. The integrated -S magnet allows direct mounting of CMSE reed and DMSE electronic solid-state sensors along the extruded aluminum barrel grooves.
This model uses a PT tapered 1/2 port and a carbon steel rod. Unlike a plain SAI cylinder, the SAIL lock holds the load statically without live pressure after the rod stops. Note that the variable air cushion at the locker end is 24mm, intentionally shorter than the 40mm cushion at the free end to accommodate the locking mechanism. The lock is not a dynamic brake and will not stop a moving rod mid-stroke.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 900 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 SAILF125X900S Is Used
Overhead Lift Hold
Secures vertical loads in the extended position during a power loss, preventing sudden drops until air is restored to the release port.
Heavy Clamp Secure
Maintains heavy clamping force at the extended stroke end on large fixtures without consuming continuous compressed air.
Gate Safety Stop
Holds heavy safety gates open at full extension, engaging automatically at the stroke terminal to prevent accidental closure.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900S the Right Lock Cylinder?
Choose this 125mm bore when 100mm (5497N at 0.7MPa) is insufficient, or step down to 80mm (3518N) if your application requires less force. Select the SAILF configuration when the load must be secured at the extended rod-out position; choose SAILB if holding the retracted position is required. If your application demands clamping at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct choice instead.
For this 900mm stroke, adding an external guide is strongly recommended to prevent excessive side-load wear on the seals. Remember that the lock provides a static hold only at the stroke end. Avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; use an independent-exhaust solenoid valve. For human-safety critical loads, always add an independent mechanical safety measure. Replacement requires matching the 125mm bore, 900mm stroke, front lock position, PT 1/2 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 SAILF125X900S FAQ
At 0.7MPa it provides 8590N of push force and 5734N of pull force. The maximum push force is 11045N at 0.9MPa.
The lock is spring-applied and air-released. It engages statically when the rod reaches the extended stroke end. Supply air to the release port or use the manual lever to unlock it.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X900S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.