Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X125
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X125 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 125mm 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.
- BoreØ50 mm
- Stroke125 mm
- Port sizeG1/4
- Lock positionFront cover
- Rod threadM16×1.5
- 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 SAILF50X125
The AirTAC SAILF50X125 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This mechanism engages automatically to secure the rod at the fully extended stroke end, safely holding a load without requiring continuous live air pressure. Delivering a 0.5 MPa push force of 982 N, it utilizes a 20 mm carbon steel rod and PT 1/4 tapered ports.
Because the lock engages at the terminal position, the variable air cushion at the locker end is physically shorter (20 mm) compared to the 30 mm cushion on the rear end. The lock releases automatically by supplying air to the release port, or manually via the override lever. For position sensing, an -S magnet option supports AirTAC CMSE reed and DMSE electronic solid-state switches.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X125 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X125 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 125 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable (30 mm free end / 20 mm lock end) |
| Max stroke | Up to 1200 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SAILF50X125 Is Used
Extended Load Holding
Maintains a securely elevated position for lifted platens at the extended stroke end, preventing drops during a sudden compressed air loss.
Pallet Stop Arm
Projects a stop arm to halt pallets on a conveyor line, using the mechanical lock to absorb repeated forward kinetic impacts without relying on air pressure.
Safety Gate Latch
Extends to block a machine access point, holding the barrier rigidly in place until the release air is actively supplied to retract the pin.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF50X125 the Right Lock Cylinder?
Select this 50 mm bore when an application requires a reliable static hold at the rod-out position, stepping up force from a 40 mm bore (628 N at 0.5 MPa) or scaling down from a 63 mm bore (1559 N). Choose SAILF for extended-end holding; if the load must be secured in a retracted state, select SAILB instead. 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.
Never use a fast-exhaust valve with this cylinder; back-pressure on the locker side can inadvertently release the lock, so an independent-exhaust solenoid valve is required. The lock is a static holding device, not a dynamic brake for moving rods. If human safety depends on the load remaining elevated, always add an independent mechanical safety measure. Replacement matches must align on the 125 mm stroke, front locker position, PT 1/4 ports, and mounting style (Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, or TCM2).
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 SAILF50X125 FAQ
At 0.5 MPa operating pressure, the push force is 982 N and the pull force is 825 N. At 0.7 MPa, the push force increases to 1374 N.
The lock is spring-applied and air-released, engaging only when the piston reaches the fully extended stroke end. It provides a static hold, not a dynamic brake. It unlocks automatically via air pressure to the release port or manually via a lever.
Related AirTAC Lock & Standard Cylinders
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