Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400 is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 400mm 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
- Stroke400 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 SAILF40X400
The AirTAC SAILF40X400 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the front cover. This mechanism engages when the piston reaches the extended stroke end, securely holding the rod-out position without requiring continuous live air pressure. In the 40mm bore class, it generates 879N of push force and 528N of pull force at 0.5 MPa, utilizing a 16mm carbon steel rod and 1/4 PT tapered port.
Because the lock occupies the front cover, the variable air cushion on that locker end is notably shorter at 20mm compared to the 27mm cushion on the free back end. The lock itself is a static holding device that engages after the cylinder stops; it is not a dynamic brake for a moving rod. To maintain safety, avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400 Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAILF40X400 Is Used
Extended Lift Holding
Maintains a lifted load at the rod-out position during power loss, preventing collapses without needing continuous air supply.
Pallet Stop Gate
Acts as a rigid stop at the extended stroke end on a conveyor line, holding stationary product flow firmly in place.
Safety Guard Positioning
Locks a machine safety guard in the open, extended position to keep hazardous areas clear during maintenance.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400 the Right Lock Cylinder?
Select this 40mm bore model when an application demands a reliable hold at the fully extended position, stepping up from smaller units if 528N of pull force at 0.5 MPa is insufficient, or stepping down from a 50mm bore (982N push) if space is tight. If your load must be clamped at an arbitrary mid-stroke point rather than the extended end, the BSAI clamp-lock cylinder is the correct choice instead of this SAILF unit.
For a direct replacement, match the 40mm bore, 400mm stroke, front locker position, 1/4 PT port, and standard mounting options like FA, FB, or TC. Since this unit lacks the -S suffix, it has no magnet for CMSE or DMSE sensors. At 400mm of stroke, the leverage on the 16mm rod amplifies side loads; always use external guide rails to prevent binding and premature seal wear. If human safety depends on the load staying extended, add an independent mechanical support.
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 SAILF40X400 FAQ
At 0.5 MPa, the 40mm bore provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The spring-applied, air-released lock engages automatically at the extended stroke end. It holds statically after the rod stops and is released by supplying air to the release port or using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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