Airtac SAILB Rear Lock Cylinder SAILB40X160S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB40X160S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 160mm stroke and a built-in spring-applied, air-released mechanical lock in the back cover — it holds the load at the retracted (rod-in) stroke end even when air is lost.
- BoreØ40 mm
- Stroke160 mm
- Port sizeG1/4
- Lock positionBack cover
- Rod threadM12×1.25
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB40X160S
The AirTAC SAILB40X160-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the back cover. Because the lock is spring-applied and air-released, it automatically secures the piston rod at the retracted stroke end the moment release pressure is removed. In the 40mm bore class, this model generates 879N of push force at 0.7MPa, making it highly effective for compact load-holding tasks.
This unit includes a standard magnet for position sensing via CMSE reed or DMSE solid-state switches. To accommodate the locking hardware, the variable air cushion at the locker end is 20mm, which is shorter than the 27mm cushion found on the non-locking free end. The lock provides a static hold after the cylinder stops; it is not a dynamic brake for a moving rod.
Airtac SAILB Rear Lock Cylinder SAILB40X160S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB40X160S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 160 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Lock type | Spring-applied, air-released (back 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 retracted (rod-in) 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 back-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 SAILB Rear Lock Cylinder SAILB40X160S Is Used
Vertical Load Holding
Secures lifted loads in the retracted position instantly upon power or air loss, preventing sudden drops.
Conveyor Arrest
Holds a stopped actuator firmly at the stroke end to maintain tension or block product flow during pauses.
Clamp and Hold
Keeps a workpiece clamped securely at the end of stroke without consuming continuous live air pressure.
Is the Airtac SAILB Rear Lock Cylinder SAILB40X160S the Right Lock Cylinder?
Choose this 40mm bore if your application requires 879N of thrust at 0.7MPa and needs the load secured specifically at the retracted position. If your process requires holding the load at an arbitrary mid-stroke point rather than the end, you must select the BSAI clamp-lock cylinder instead. For higher force requirements, stepping up to the 50mm bore yields 1374N at 0.7MPa.
When integrating this SAILB model, avoid using fast-exhaust valves, 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 retracted, add an independent mechanical safety measure. Replacement matches require a 40mm bore, 160mm stroke, back locker position, PT port threads, and the -S magnet option.
Quick checklist
- ✓ Hold needed at the retracted (rod-in) end?
- ✓ Or lock anywhere → use BSAI
- ✓ Independent-exhaust valve fitted
- ✓ Port/thread type (PT/G)
- ✓ Extra safety measure for people
Airtac SAILB Rear Lock Cylinder SAILB40X160S FAQ
At 0.7MPa operating pressure, the 40mm bore provides 879N of push force and 740N of pull force. It achieves a maximum of 1130N push force at 0.9MPa.
The lock is spring-applied and air-released. It engages statically to hold the rod at the retracted stroke end when air is cut off. You can unlock it automatically by supplying release air or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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