Airtac SAILB Rear Lock Cylinder SAILB80X50
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB80X50 is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm bore, 50mm 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.
- BoreØ80 mm
- Stroke50 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB80X50
The AirTAC SAILB80X50 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock housed in the back cover. A spring-applied, air-released mechanism engages a lock pin to hold the rod securely at the retracted stroke end, maintaining the load position even when air pressure is lost. Delivering 2513N of push force at 0.5 MPa, this unit is dimensionally interchangeable per ISO 15552 mounting standards.
The lock is a static holding device that engages after the piston stops, not a dynamic brake for a moving rod. It operates via automatic air release or a manual override lever. Note that the variable air cushion at the locker end is 22.5mm, intentionally shorter than the 36mm cushion at the free end to accommodate the locking hardware.
Airtac SAILB Rear Lock Cylinder SAILB80X50 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB80X50 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 50 mm |
| Acting type | Double acting, with lock |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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 (36 mm free end / 22.5 mm lock end) |
| Max stroke | Up to 1500 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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 SAILB80X50 Is Used
Vertical Load Safety
Secures lifted materials at the retracted stroke end, preventing sudden drops during a power loss event.
End-Stroke Clamping
Holds a workpiece firmly in place at the rod-in position without continuously consuming compressed air.
Gate and Guard Holding
Keeps heavy safety barriers locked in the retracted closed position until air release is actively applied.
Is the Airtac SAILB Rear Lock Cylinder SAILB80X50 the Right Lock Cylinder?
Choose this 80mm bore for medium-force applications needing 2513N push or 2268N pull force at 0.5 MPa; step down to a 63mm bore if your load requires only 1559N. Select SAILB to hold the load at the retracted rod-in position, whereas SAILF holds at the extended rod-out position. If your application requires locking at an arbitrary mid-stroke point rather than a stroke end, select the BSAI clamp-lock cylinder instead.
Remember that the lock holds statically at the stroke end without live air. Never use a fast-exhaust valve with this cylinder; always use an independent-exhaust solenoid valve because back-pressure on the locker side can unintentionally release the lock. For human safety dependencies, add an independent safety measure. Replacement match: 80mm bore, 50mm stroke, back lock, PT ports, standard carbon steel rod, no magnet.
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 SAILB80X50 FAQ
At 0.5 MPa operating pressure, the 80mm bore provides 2513N of push force and 2268N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 513 kgf.
The spring-applied, air-released lock engages statically at the retracted stroke end in the back cover. It unlocks automatically via air supply or manually via a lever. It does not clamp mid-stroke and requires an independent-exhaust solenoid valve to prevent back-pressure release.
Related AirTAC Lock & Standard Cylinders
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