Airtac SAILB Rear Lock Cylinder SAILB200X50
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB200X50 is a genuine double-acting ISO 15552 profile cylinder with a Ø200mm 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.
- BoreØ200 mm
- Stroke50 mm
- Port sizeG3/4
- Lock positionBack cover
- Rod threadM36×2
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB200X50
The AirTAC SAILB200X50 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock housed in the back cover. This spring-applied, air-released mechanism engages automatically when the piston reaches the retracted stroke end, securely holding substantial loads up to 3204 kgf without requiring continuous live air pressure. You can release the lock pneumatically via the air port or override it manually.
Belonging to the 200mm bore class, this massive actuator provides a pull force of 15080N at 0.5MPa and a maximum push of 15708N. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches, though this specific configuration omits the standard magnet. To accommodate the lock hardware, the variable air cushion at the locker end is notably shorter at 28mm compared to the 50mm cushion on the free end.
Airtac SAILB Rear Lock Cylinder SAILB200X50 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB200X50 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø200 mm |
| Stroke | 50 mm |
| Acting type | Double acting, with lock |
| Port size | G3/4 |
| Rod thread | M36×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable (50 mm free end / 28 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 (Ø200mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 15708 N | 15080 N |
| 0.7 MPa | 21991 N | — |
| Max (@1.0 MPa) | 3204 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 SAILB200X50 Is Used
Heavy Vertical Lifts
Secures massive elevated loads in the retracted position instantly upon air pressure loss, preventing sudden drops on heavy machinery.
Press Safety Hold
Maintains a locked retracted state on large presses during power loss or maintenance cycles without consuming continuous pneumatic energy.
Clamp and Secure
Holds heavy workpieces or structural gates firmly at the rod-in stroke end until the release air is actively supplied to unlock the mechanism.
Is the Airtac SAILB Rear Lock Cylinder SAILB200X50 the Right Lock Cylinder?
Choose this 200mm bore size when your application requires extreme holding force at the retracted position; stepping down to a 160mm bore reduces the 0.5MPa pull force to 9425N. Select the SAILB configuration specifically because the load must be secured in the rod-in state, whereas a SAILF variant would hold the extended position. If your machinery requires clamping at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct alternative.
Because the lock is a static holding device that engages only after the cylinder stops, it cannot brake a moving rod. For safe operation, do not 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 retracted, always add an independent mechanical safety measure. When replacing this unit, verify the 50mm stroke, back locker position, 3/4 PT port, and your required mounting style from the full ISO 15552 set.
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 SAILB200X50 FAQ
The 200mm bore provides a push force of 15708N and a pull force of 15080N at 0.5MPa. At the maximum operating pressure of 1.0MPa, it achieves a push force of 3204 kgf.
The lock is spring-applied and air-released, located in the back cover to hold the rod securely at the retracted stroke end. It engages as a static hold after the cylinder stops and can be unlocked automatically via air or manually, but it cannot stop a moving rod.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILB Rear Lock Cylinder SAILB200X50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.