Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X125
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X125 is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm 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.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Lock positionFront cover
- Rod threadM12×1.25
- 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 SAILF40X125
The AirTAC SAILF40X125 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, securely holding the load without requiring continuous live air pressure. Delivering 879N of push force at 0.7 MPa, this 40mm bore unit utilizes a 1/4 PT port and a 16mm carbon steel rod.
Because the lock occupies the front end, the variable air cushion on that side is notably shorter at 20mm compared to the 27mm cushion on the free back end. The lock releases automatically by supplying air to the release port, or manually via the override lever. For position sensing, adding a magnet allows the use of CMSE reed or DMSE electronic sensors in the dual-side barrel grooves.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X125 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X125 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 (27 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 SAILF40X125 Is Used
Vertical Lift Safety
Holds an extended vertical load securely in place during a power loss event, preventing sudden drops.
Transfer Line Hold
Locks a diverter arm in the extended outward position to maintain product flow routing without constant air pressure.
Safety Gate Lock
Keeps a machine access door physically barred at the fully open end of stroke until the release air is restored.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X125 the Right Lock Cylinder?
Choose this 40mm bore model when your application demands 879N of push force at 0.7 MPa and requires a fail-safe hold at the extended stroke end. If your load must be clamped at an arbitrary mid-stroke position rather than the terminal end, select the BSAI clamp-lock cylinder instead. The SAILF variant specifically secures the rod-out position, whereas SAILB holds the retracted rod-in state.
Critical valve selection is required: never use a fast-exhaust valve with this lock cylinder, as back-pressure on the locker side can unintentionally release the lock. Always use an independent-exhaust solenoid valve. The lock provides a static hold after the rod stops; it is not a dynamic brake. If human safety relies on the load remaining extended, implement an additional independent safety measure. To replace this unit, match the 40mm bore, 125mm stroke, front locker position, 1/4 PT port, and standard mounting.
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 SAILF40X125 FAQ
At 0.7 MPa, this 40mm bore cylinder generates 879N of push force and 528N of pull force. The maximum operating pressure is 1.0 MPa.
The lock is spring-applied and air-released. It engages statically when the rod reaches the fully extended stroke end. To unlock, supply air to the release port or use the manual lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X125
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.