Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X80
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X80 is a genuine double-acting ISO 15552 profile cylinder with a Ø125mm bore, 80mm 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
- Stroke80 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 SAILF125X80
The AirTAC SAILF125X80 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. Because the lock resides in the front end, it engages when the piston reaches the extended stroke terminal, securely holding the rod and load in the rod-out position without requiring continuous live air pressure. In the 125mm bore class, this actuator generates 6136N of push force and 5734N of pull force at 0.5 MPa, making it well suited for heavy-duty holding tasks.
The lock itself is a static holding device that engages only after the cylinder has stopped, rather than a dynamic brake for a moving rod. It is released automatically by supplying air to the release port, or manually via the override lever. For position sensing, the barrel features dual sensor grooves ready to accept AirTAC CMSE reed or DMSE electronic solid-state switches. Note that the variable air cushion at the locker end is 24mm, intentionally shorter than the 40mm cushion on the free end, to accommodate the locking mechanism.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X80 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X80 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø125 mm |
| Stroke | 80 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 SAILF125X80 Is Used
Extended Lift Holding
Maintains a lifted platform securely at the extended stroke end during a power loss, preventing gravity-driven drops without consuming continuous air.
Heavy Flow Diversion
Locks a heavy diverter arm in the rod-out position to securely route large materials, ensuring the guide stays fixed even if supply pressure fluctuates.
Safety Gate Barrier
Provides a rigid, pressure-independent mechanical block at the extended end to keep heavy safety gates and access barriers firmly open.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF125X80 the Right Lock Cylinder?
Choose this SAILF125X80 when your application requires a fail-safe hold at the fully extended position; if you need to secure the load at the retracted rod-in position instead, select the SAILB variant. If your process demands locking at an arbitrary mid-stroke point rather than a stroke terminal, the AirTAC BSAI clamp-lock cylinder is the correct choice. For lighter loads, the 100mm bore provides 3927N push at 0.5 MPa, while stepping up to the 160mm bore yields 10053N.
When integrating this cylinder, strictly avoid using a fast-exhaust valve, as back-pressure on the locker side can unintentionally release the lock; always use an independent-exhaust solenoid valve. If human safety depends on the load remaining elevated, add an independent safety measure. To replace this unit, match the 125mm bore, 80mm stroke, front locker position, PT port threads, and your required mounting accessories.
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 SAILF125X80 FAQ
At 0.5 MPa, the 125mm bore provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The lock is spring-applied and air-released, engaging statically when the piston reaches the extended stroke end. It unlocks automatically by supplying air to the release port or manually via the lever; it does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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