Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400S
The AirTAC Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400S 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 SAILF40X400S
The AirTAC SAILF40X400-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released mechanical lock 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 at 0.7 MPa, making it well-suited for compact load-holding tasks.
This model includes a magnet (-S) for position sensing with AirTAC CMSE reed and DMSE electronic switches. The variable air cushion at the locker end is notably shorter at 20mm compared to 27mm on the free end, a design necessity for housing the locking mechanism. The standard carbon steel rod and PT tapered port threads ensure robust mechanical integration.
Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400S Technical Specifications
| Model | Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400S |
|---|---|
| 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 SAILF40X400S Is Used
Vertical Lift Holding
Secures a raised vertical load in the extended position during a power loss, preventing sudden drops without relying on live air pressure.
Pallet Stop Gate
Acts as a rigid stop at the extended stroke end on a conveyor line, holding heavy items firmly in place for processing.
Safety Guard Position
Locks a machine safety door in the open, extended position to keep the hazardous area safely accessible until air is reapplied.
Is the Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400S the Right Lock Cylinder?
Choose this 40mm bore cylinder when an application demands 879N of thrust at 0.7 MPa; step up to a 50mm bore if you need 1374N, or down if less force is required. Select the SAILF front-locker variant to hold the rod in the extended position, whereas a SAILB back-locker variant holds the retracted position. If your process requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, the BSAI clamp-lock cylinder is the correct choice instead.
Because the lock is a static holding device that engages only after the cylinder stops, it will not brake a moving rod. Avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; always utilize an independent-exhaust solenoid valve. For any human-safety critical lifting application, add an independent safety measure. With a 400mm stroke, use external guide rails to prevent side-loading damage to the 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 SAILF40X400S 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 lock is spring-applied and air-released, engaging only when the piston reaches the extended stroke end. It provides a static hold, not a dynamic brake, and is released automatically by supplying air to the release port or via the manual release lever.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILF Front Locking Pneumatic Cylinder SAILF40X400S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.