Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X600
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X600 is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 600mm 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
- Stroke600 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 SAILF125X600
The AirTAC SAILF125X600 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This lock engages when the piston reaches the extended stroke end, securely holding the rod and load in place without requiring continuous live air pressure. With a robust 125mm bore, it generates 8590N of push force and 5734N of pull force at 0.7 MPa, making it suitable for heavy-duty holding tasks.
The lock is a static holding device, not a dynamic brake, meaning it secures the rod only after motion has stopped at the terminal position. To release the load, you can supply air to the release port for automatic unlocking or use the manual release lever. Note that the variable air cushion at the locker end is shorter (24mm) than the free end (40mm) to accommodate the locking mechanism. Position detection is possible by adding a magnet (-S) to work with AirTAC CMSE reed or DMSE electronic sensors.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X600 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X600 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 600 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 SAILF125X600 Is Used
Extended Lift Hold
Holds heavy vertical loads securely at the top extended stroke end during power loss, preventing accidental descent on lifting platforms.
Pallet Stop Gate
Locks a conveyor pallet at the rod-out terminal position to halt work-in-progress without consuming continuous compressed air.
Safety Barrier Arm
Extends and mechanically locks a heavy guard arm in place to secure a hazardous machine cell during maintenance.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X600 the Right Lock Cylinder?
Choose this 125mm bore size when you need high force output that exceeds the 5497N push at 0.7 MPa offered by the 100mm variant, but do not require the extreme 14074N thrust of the 160mm bore. Select the SAILF configuration specifically because the load must be held securely at the extended (rod-out) stroke end; if your application requires holding at the retracted position, the SAILB version is the correct choice.
If your process requires locking at an arbitrary mid-stroke point rather than the terminal end, you must use the BSAI clamp-lock cylinder instead of this model. For safe operation, never use a fast-exhaust valve with this lock cylinder, as back-pressure on the locker side can inadvertently release the lock; always use an independent-exhaust solenoid valve. Because human safety may depend on the load staying up, add an independent safety measure. Additionally, with a 600mm stroke, you must account for potential side-loading and use proper guide rails to prevent rod binding. Replacement parts must match the 125mm bore, 600mm stroke, front locker position, PT tapered ports, and your required mounting style from the ISO 15552 interface.
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 SAILF125X600 FAQ
The 125mm bore generates 6136N push and 5734N pull force at 0.5 MPa, and 8590N push force at 0.7 MPa. The maximum operating pressure is 1.0 MPa.
The spring-applied lock engages automatically when the rod reaches the extended stroke end, holding the load without live air. It releases by supplying air to the release port or by using the manual release lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X600
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.