Airtac SAILB Rear Lock Cylinder SAILB50X80S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB50X80S is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm 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.
- BoreØ50 mm
- Stroke80 mm
- Port sizeG1/4
- Lock positionBack cover
- Rod threadM16×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB50X80S
The AirTAC SAILB50X80-S is a double-acting ISO 15552 profile cylinder equipped with a carbon steel rod and a built-in mechanical lock in the back cover. Because it is an -S variant, it includes a magnet ready for AirTAC CMSE reed and DMSE electronic sensors. The spring-applied, air-released lock engages when the piston reaches the retracted stroke end, providing reliable static load holding without relying on live air pressure.
Operating at 0.5 MPa, this 50mm bore generates 982N of push force and 825N of pull force. To unlock the rod, you simply supply air to the release port or use the manual override lever. A notable design detail is that the variable air cushion at the locker end is 20mm, which is shorter than the 30mm cushion on the free end, ensuring compact deceleration without interfering with the lock mechanism.
Airtac SAILB Rear Lock Cylinder SAILB50X80S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB50X80S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 80 mm |
| Acting type | Double acting, with lock |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 (30 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 SAILB50X80S Is Used
Vertical Lift Safety
Holds a lifted load safely at the retracted stroke end when air pressure drops, preventing sudden falls on vertical lifting jigs.
Conveyor Pause Hold
Locks a diverter or stopper block in the retracted state during an emergency stop to maintain a safe clearance zone.
Clamp and Hold
Secures a workpiece at the end of the machining cycle, maintaining consistent positioning without consuming continuous air.
Is the Airtac SAILB Rear Lock Cylinder SAILB50X80S the Right Lock Cylinder?
Choose this SAILB model when your application requires the load to be safely held at the fully retracted position upon power loss. If you need higher clamping power, stepping up to the 63mm bore increases thrust to 1559N at 0.5 MPa; conversely, the 40mm bore offers 628N for lighter loads. If your process requires locking at an arbitrary mid-stroke point rather than the stroke end, select the BSAI clamp-lock cylinder instead.
Remember that the SAIL lock is a static holding device, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. For human-safety critical loads, always add an independent safety measure. To replace this unit, match the 50mm bore, 80mm stroke, back locker position, PT port threads, and -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 SAILB50X80S FAQ
At 0.5 MPa, the 50mm bore provides 982N of push force and 825N of pull force. At 0.7 MPa, the push force increases to 1374N.
The lock is spring-applied and air-released, engaging statically at the retracted stroke end. It does not clamp mid-stroke. You can unlock it automatically by supplying release air or manually via the lever, but avoid fast-exhaust valves to prevent back-pressure from releasing the lock.
Related AirTAC Lock & Standard Cylinders
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