Airtac SAILB Rear Lock Cylinder SAILB50X150
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB50X150 is a genuine double-acting ISO 15552 profile cylinder with a Ø50mm bore, 150mm 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
- Stroke150 mm
- Port sizeG1/4
- Lock positionBack cover
- Rod threadM16×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB50X150
The AirTAC SAILB50X150 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 a load in the rod-in position without requiring continuous live air pressure. In the 50mm bore class, this pneumatic cylinder delivers a push force of 982N and a pull force of 825N at 0.5MPa, making it well-suited for moderate vertical load-holding tasks.
A standard carbon steel rod and PT tapered port threads equip this model for robust industrial use. Without the -S magnet option specified, it does not support CMSE reed or DMSE electronic sensors. The variable air cushion at the locker end is notably shorter at 20mm compared to the 30mm cushion on the free end, ensuring safe deceleration without interfering with the lock engagement. The lock itself is a static holding device, meaning it engages only after the rod has come to a complete stop.
Airtac SAILB Rear Lock Cylinder SAILB50X150 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB50X150 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø50 mm |
| Stroke | 150 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 SAILB50X150 Is Used
Vertical Load Holding
Secures elevated loads in the retracted position automatically during power loss, preventing sudden drops in lifting mechanisms.
Conveyor Stopper
Holds a pneumatic stopper block firmly in place at the end of stroke to halt product flow without consuming continuous air.
Safety Gate Lock
Keeps heavy machine safety gates locked shut in the rod-in position until the release air is actively supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB50X150 the Right Lock Cylinder?
Select this 50mm bore model when your application requires holding a load safely at the fully retracted position, offering 982N of thrust at 0.5MPa. If your application demands less force, stepping down to a 40mm bore provides 628N, while moving up to a 63mm bore yields 1559N for heavier loads. Choose this SAILB configuration specifically when the lock must hold the rod-in stroke end; select a SAILF variant instead if your safety hold is required at the extended position. For applications where the load must be clamped at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is the correct choice.
When integrating this cylinder, never use a fast-exhaust valve, as back-pressure on the locker side can inadvertently release the lock; an independent-exhaust solenoid valve is required. If human safety depends on the load remaining suspended, always add an independent safety measure alongside the mechanical lock. For replacement matching, verify the 50mm bore, 150mm stroke, back locker position, PT port threads, and standard carbon steel rod. The operating speed range is 30-800mm/s.
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 SAILB50X150 FAQ
At 0.5MPa operating pressure, the 50mm bore provides a push force of 982N and a pull force of 825N. At the maximum pressure of 1.0MPa, the push force reaches 200kgf.
The lock is spring-applied and air-released, located in the back cover to hold the rod only at the fully retracted stroke end. It is a static lock that engages after the cylinder stops, and can be released automatically via air or manually via a lever.
Related AirTAC Lock & Standard Cylinders
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