Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X125
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X125 is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm 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.
- BoreØ125 mm
- Stroke125 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 SAILF125X125
The AirTAC SAILF125X125 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the front cover. A spring-applied, air-released lock engages when the piston reaches the extended stroke end, ensuring the load remains securely held without requiring continuous live air pressure. Delivering 6136N of push force at 0.5 MPa, this 125mm bore cylinder utilizes a 32mm carbon steel rod and a 1/2 PT port. The lock-end air cushion is 24mm, intentionally shorter than the 40mm cushion on the free end to accommodate the locking mechanism.
This model operates at speeds between 30 and 500 mm/s and includes a manual release lever alongside the standard automatic air-release function. The extruded aluminum barrel is designed for use with AirTAC CMSE reed and DMSE electronic sensors when a magnet is specified. Because the lock is a static holding device that engages only after the cylinder stops, it is not intended to brake a moving rod.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X125 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X125 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAILF125X125 Is Used
Overhead Lift Safety
Holds a vertical lift securely at the extended top position during a power loss, preventing gravity-driven drops.
Pallet Stop Gate
Locks an extended diverter gate in place at the end of stroke to halt heavy pallet traffic without consuming air.
Press Clamp Hold
Maintains high clamping force on an extended press fixture, keeping the workpiece secured while air pressure is removed.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X125 the Right Lock Cylinder?
Choose this 125mm bore cylinder when an application requires 6136N of push force at 0.5 MPa, or step down to the 80mm bore if 2513N is sufficient. Select the SAILF configuration when the load must be held at the extended rod-out position; choose SAILB for retracted holding. If the process requires locking at an arbitrary mid-stroke point rather than the stroke end, the AirTAC BSAI clamp-lock cylinder is the correct choice instead.
For reliable lock operation, avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. Always add an independent mechanical safety measure if human safety depends on the load remaining elevated. To replace this unit, match the 125mm bore, 125mm stroke, front locker position, PT port thread, and standard carbon steel rod.
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 SAILF125X125 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. The maximum push force reaches 11045N at 0.9 MPa.
The lock is spring-applied and air-released. It engages automatically to hold the rod statically at the extended stroke end when air is cut off. To unlock, supply release air or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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