Airtac SAILB Rear Lock Cylinder SAILB50X50
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB50X50 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm 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.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Lock positionBack cover
- Rod threadM16×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB50X50
The AirTAC SAILB50X50 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. This safety mechanism engages a lock pin to hold the rod securely at the retracted stroke end, maintaining the load position without requiring live air pressure. With a 50mm bore, it generates 982N of thrust at 0.5 MPa, making it well-suited for medium-duty holding tasks.
The cylinder features a carbon steel rod and a PT tapered port thread. It includes variable air cushioning at both ends, but the locker-end cushion is notably shorter at 20mm compared to the 30mm cushion on the free end. For position sensing, adding the -S magnet option enables compatibility with AirTAC CMSE reed and DMSE solid-state sensors.
Airtac SAILB Rear Lock Cylinder SAILB50X50 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB50X50 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 50 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 SAILB50X50 Is Used
Vertical Lift Holding
Prevents gravity-loaded vertical platforms from drifting down when air pressure is removed, locking safely at the retracted stroke end.
Power Failure Safety
Maintains a secure clamp position during sudden air supply loss, ensuring workpieces remain held without relying on live pressure.
Gate and Guard Locking
Secures heavy safety gates or machine guards in the closed position automatically, requiring an air signal to unlock.
Is the Airtac SAILB Rear Lock Cylinder SAILB50X50 the Right Lock Cylinder?
Choose this 50mm bore model when your application requires 982N of push force at 0.5 MPa; if your load demands less holding power, step down to the 40mm bore offering 628N. Select the SAILB configuration when the load must be held in the retracted position, and choose SAILF if it needs holding at the extended end. If your application requires locking at an arbitrary mid-stroke point rather than the stroke terminal, the BSAI clamp-lock cylinder is the correct alternative.
Remember that this lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; use an independent-exhaust solenoid valve instead. For safety-critical loads that could cause injury if they drop, always add an independent mechanical safety measure. Direct replacement requires matching the 50mm bore, 50mm stroke, back locker position, PT port, and mounting style.
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 SAILB50X50 FAQ
At 0.5 MPa operating pressure, the 50mm bore provides 982N of push force and 825N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 200 kgf of push force.
The lock is spring-applied and air-released, engaging only when the piston reaches the retracted stroke end in the back cover. It provides a static hold after the rod stops, not a dynamic brake, and can be unlocked via air pressure or a manual lever.
Related AirTAC Lock & Standard Cylinders
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