Airtac SAILB Rear Lock Cylinder SAILB40X80
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB40X80 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 SAILB40X80
The AirTAC SAILB40X80 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. This integrated lock holds the rod securely at the retracted stroke end, maintaining the load position without requiring continuous live air pressure. Delivering 879N of push force at 0.7MPa, it provides reliable power-loss safety for vertical and horizontal holding tasks.
Because the lock engages only at the stroke terminal, the locker-end air cushion is intentionally shorter at 20mm compared to the 27mm cushion on the free end. The cylinder uses a 16mm carbon steel rod with PT threaded ports. For position sensing, adding a magnet allows the use of AirTAC CMSE reed or DMSE solid-state sensors in the dual-side barrel grooves.
Airtac SAILB Rear Lock Cylinder SAILB40X80 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB40X80 |
|---|---|
| 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 SAILB40X80 Is Used
Vertical Power-Off Hold
Secures a 40mm bore vertical lift in the retracted position instantly when air pressure drops, preventing uncontrolled descent.
Retracted Safety Lock
Holds the rod firmly at the back stroke end during emergency stops or maintenance, ensuring the load remains safely pulled in.
Clamp-and-Hold Station
Maintains a clamped workpiece at the retracted terminal without consuming continuous air, saving energy between cycles.
Is the Airtac SAILB Rear Lock Cylinder SAILB40X80 the Right Lock Cylinder?
Choose this 40mm bore when you need 879N of thrust at 0.7MPa; step up to the 63mm bore if your application requires 2182N, or drop to a 32mm non-lock profile if load-holding is unnecessary. Select this SAILB configuration when the load must be secured in the retracted position, and choose SAILF if the extended end requires holding. If your process demands mid-stroke clamping at any arbitrary point, select the BSAI clamp-lock cylinder instead.
The lock provides a static hold after the cylinder stops; it is not a dynamic brake. Never use a fast-exhaust valve with this unit, as back-pressure on the locker side can unintentionally release the lock—use an independent-exhaust solenoid valve. If human safety depends on the load remaining elevated, always add an independent mechanical safety measure. Replacement parts must match the 40mm bore, 80mm stroke, back locker position, PT port, and standard mounting interface.
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 SAILB40X80 FAQ
The 40mm bore generates 628N of push and 528N of pull force at 0.5MPa. At 0.7MPa, the push force increases to 879N, with a maximum push force of 1130N at 0.9MPa.
The lock is spring-applied and air-released, engaging only at the retracted stroke end to provide a static hold. It unlocks automatically via air supply or manually via a lever. It does not clamp at mid-stroke, and using an independent-exhaust solenoid valve is required to prevent back-pressure from releasing the lock.
Related AirTAC Lock & Standard Cylinders
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