Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X350
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X350 is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 350mm 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
- Stroke350 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 SAILF125X350
The AirTAC SAILF125X350 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 drives a lock pin into the rod, securely holding the load at the extended stroke end without relying on live pressure. You can unlock it automatically by supplying air to the release port or by using the manual release lever. In the 125mm bore class, this actuator generates 6136N of push force and 5734N of pull force at a 0.5MPa operating pressure.
A notable design trait of this locker-side end is its shorter variable air cushion, which measures 24mm compared to the 40mm cushion on the standard free end. The standard carbon steel rod provides durable service, and while this unit lacks a magnet for position sensing, the extruded aluminum barrel is machined to accept sensors on both sides if you switch to a -S variant later. Remember that the lock is a static holding device that engages after the piston stops, rather than a dynamic brake for a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X350 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X350 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAILF125X350 Is Used
Overhead Lift Safety
Holds a lifted vertical load securely at the extended stroke end the moment air pressure is cut, preventing sudden drops during a power loss event.
Pallet Stop Gate
Locks a diverter gate in the rod-out position to halt heavy pallet traffic on a conveyor line, keeping the barrier rigid without consuming continuous air supply.
Extended Clamp Hold
Maintains maximum outward clamping pressure on a large workpiece at the stroke terminal, ensuring the part stays fixed during secondary machining operations.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X350 the Right Lock Cylinder?
Select this 125mm bore model when an application demands 6136N of thrust at 0.5MPa and a secure hold at the rod-out position; if your system requires less force, stepping down to an 80mm bore yields 2513N of push force, while upgrading to a 160mm bore provides 10053N. Choose this SAILF configuration specifically because the load must be retained at the extended stroke end, whereas a SAILB variant holds the retracted position. If your machinery needs to clamp and hold the rod at an arbitrary mid-stroke point rather than a stroke terminal, you must select a BSAI clamp-lock cylinder instead.
For safe operation, never use a fast-exhaust valve with this lock cylinder; always utilize an independent-exhaust solenoid valve, as back-pressure on the locker side can inadvertently release the lock. Furthermore, if human safety depends on the load remaining elevated, add an independent safety measure as a backup. Since the 350mm stroke exceeds the 300mm threshold, ensure you use a linear guide to manage side loads and prevent rod binding. When seeking a replacement, verify the 125mm bore, 350mm stroke, front locker position, PT tapered port threads, and the appropriate mounting style from the 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 SAILF125X350 FAQ
At a 0.5MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. If you increase the pressure to 0.7MPa, the push force rises to 8590N.
The lock is spring-applied and air-released, meaning it automatically engages to hold the rod at the extended stroke end when pressure is cut. To unlock it, you supply air to the release port for automatic retraction or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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