Airtac SAILB Rear Lock Cylinder SAILB200X800S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB200X800S is a genuine double-acting ISO 15552 profile cylinder with a Ø200mm bore, 800mm 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
- Stroke800 mm
- Port sizeG3/4
- Lock positionBack cover
- Rod threadM36×2
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB200X800S
The AirTAC SAILB200X800-S is a double-acting ISO 15552 profile cylinder equipped with a mechanical lock in the back cover. Because the lock is spring-applied and air-released, it automatically secures the rod at the retracted stroke end whenever release pressure is cut, holding heavy loads safely without consuming live air. In this 200mm bore size, the cylinder generates a substantial 21991N of push force at 0.7MPa, making it ideal for massive lifting duties. The integrated -S magnet enables precise position sensing via CMSE reed or DMSE electronic switches.
A notable mechanical detail is the variable air cushioning: the locker end features a 28mm cushion stroke, which is deliberately shorter than the 50mm cushion found on the free end to accommodate the locking mechanism. The carbon steel rod provides high tensile strength for rigorous industrial environments. Remember that the lock engages statically after the piston stops at the stroke terminal; it is not a dynamic brake for a moving rod.
Airtac SAILB Rear Lock Cylinder SAILB200X800S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB200X800S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø200 mm |
| Stroke | 800 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 SAILB200X800S Is Used
Heavy Lift Safety Hold
Secures massive vertical lifts in the retracted position during a power loss event, keeping the load safely lowered without relying on continuous air pressure.
Press Safety Lock
Holds a heavy press platen securely at the rod-in stroke end after the cycle completes, ensuring the tooling remains safely open during operator loading.
Gate Retention
Locks industrial safety gates or heavy bulkhead doors in the closed position, requiring an intentional air-release signal to unlock and open.
Is the Airtac SAILB Rear Lock Cylinder SAILB200X800S the Right Lock Cylinder?
Select this 200mm bore model when an application demands immense thrust alongside fail-safe load holding at the retracted position. If 21991N push at 0.7MPa exceeds your requirements, stepping down to a 160mm bore yields 14074N push at 0.5MPa, offering a more compact footprint. Choose the SAILB configuration specifically when the load must be secured in the rod-in state; select a SAILF variant instead if the extended position requires holding. For applications needing the load clamped at an arbitrary mid-stroke point rather than the stroke end, the AirTAC BSAI clamp-lock cylinder is the correct choice.
When integrating this cylinder, valve selection is a critical red-line: never use a fast-exhaust valve, and always utilize an independent-exhaust solenoid valve, as back-pressure on the locker side can unintentionally release the lock. Furthermore, the 800mm stroke on this large-bore cylinder necessitates careful side-load management; ensure external guide rails are used to prevent rod binding. If human safety depends on the load remaining retracted, always add an independent mechanical safety measure beyond the pneumatic lock. Replacement specifications must match the 200mm bore, 800mm stroke, back locker position, PT tapered ports, and the -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 SAILB200X800S FAQ
At a standard operating pressure of 0.7MPa, this 200mm bore cylinder provides 21991N of push force and 15080N of pull force. At its maximum rated pressure of 1.0MPa, the push force reaches 15708N.
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 statically after the cylinder stops, not as a mid-stroke brake. Unlocking is achieved automatically by supplying air to the release port, or manually via the release lever.
Related AirTAC Lock & Standard Cylinders
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