Airtac SAILB Rear Lock Cylinder SAILB40X80S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB40X80S is a genuine double-acting ISO 15552 profile cylinder with a Ø40mm bore, 80mm 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
- Stroke80 mm
- Port sizeG1/4
- Lock positionBack cover
- Rod threadM12×1.25
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB40X80S
The AirTAC SAILB40X80-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. Because the lock engages when the piston reaches the retracted stroke end, it securely holds the rod-in position without requiring continuous live air pressure. Equipped with a magnet, it supports position sensing via AirTAC CMSE reed and DMSE electronic switches.
In the 40mm bore class, this actuator generates 879N of push force and 528N of pull force at 0.5 MPa. The variable air cushion decelerates the piston near the stroke terminals, but note that the locker-end cushion is physically shorter (20mm) compared to the free end (27mm). The lock itself provides the static holding force after the cylinder stops; it is not a dynamic brake for a moving rod.
Airtac SAILB Rear Lock Cylinder SAILB40X80S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB40X80S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø40 mm |
| Stroke | 80 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 SAILB40X80S Is Used
Vertical Retract Safety
Holds a lifted vertical load securely in the retracted position during a sudden air pressure loss or power failure.
Conveyor Stroke End Hold
Locks a conveyor diverter in the retracted state without consuming continuous compressed air, saving energy.
Guard Door Secure
Keeps a machine guard door firmly pulled back and locked at the stroke end until the release air is actively supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB40X80S the Right Lock Cylinder?
Choose this 40mm bore when your application demands a fail-safe hold at the retracted position, as the back-mounted lock specifically secures the rod-in stroke end. If your load must be clamped at an arbitrary mid-stroke point rather than the terminal end, select the AirTAC BSAI clamp-lock cylinder instead. For loads requiring a higher force class, stepping up to the 50mm bore yields 1374N of push force at 0.5 MPa.
When integrating this cylinder, avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; always utilize an independent-exhaust solenoid valve. If human safety depends on the load staying retracted, add an independent mechanical safety measure as well. To match this exact unit for replacement, verify the 80mm stroke, PT tapered port threads, carbon steel rod, back locker position, 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 SAILB40X80S FAQ
At an operating pressure of 0.5 MPa, this 40mm bore cylinder provides 879N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 1130N.
The lock is spring-applied and air-released, meaning it engages automatically to hold the rod at the retracted stroke end when release air is cut off. You can unlock it by supplying air to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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