Airtac SAILB Rear Lock Cylinder SAILB200X450
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB200X450 is a genuine double-acting ISO 15552 profile cylinder with a Ø200mm bore, 450mm 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
- Stroke450 mm
- Port sizeG3/4
- Lock positionBack cover
- Rod threadM36×2
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB200X450
The AirTAC SAILB200X450 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. This lock engages automatically when the piston reaches the retracted stroke end, providing essential static load holding during a power or air loss. In the 200mm bore class, it generates a substantial 15708N thrust at 0.5MPa and safely sustains heavy vertical loads without requiring continuous live pressure.
Unlike a plain SAI cylinder, this SAIL variant incorporates a shorter 28mm variable air cushion at the locker end compared to the 50mm cushion on the free end, effectively managing end-of-stroke deceleration. The lock itself is a static holding device rather than a dynamic brake. For pneumatic routing, avoid fast-exhaust valves and use an independent-exhaust solenoid valve, because back-pressure on the locker side can inadvertently release the lock pin.
Airtac SAILB Rear Lock Cylinder SAILB200X450 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB200X450 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø200 mm |
| Stroke | 450 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 SAILB200X450 Is Used
Heavy Lift Safety Hold
Secures massive lifted structures in the retracted position, preventing catastrophic drops if air supply suddenly fails.
Press Clamp Retention
Maintains high-force clamping pressure at the stroke terminal without consuming continuous compressed air.
Machine Guard Locking
Holds heavy safety barriers firmly in the closed position during power loss to protect operators.
Is the Airtac SAILB Rear Lock Cylinder SAILB200X450 the Right Lock Cylinder?
Select this 200mm bore model when an application demands 15708N of push force at 0.5MPa, or step down to a 160mm bore providing 10053N if the load is lighter. Choose this SAILB configuration to secure the rod at the retracted stroke end; if your process requires holding at the extended end, select the SAILF equivalent. For operations that must clamp at an arbitrary mid-stroke position rather than a stroke terminal, the BSAI clamp-lock cylinder is the correct alternative. Because the stroke is 450mm, integrating an external guide is highly recommended to prevent excessive side loads on the 40mm carbon steel rod. Always add an independent safety measure for human safety-critical suspended loads. Replacement specifications require matching the 200mm bore, 450mm stroke, PT tapered port threads, and the standard mounting interface.
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 SAILB200X450 FAQ
At a 0.5MPa operating pressure, this 200mm bore cylinder provides 15708N of push thrust and 15080N of pull thrust. It achieves a maximum push force of 21991N at 0.7MPa.
The lock is spring-applied and air-released, engaging statically only when the piston reaches the retracted stroke end in the back cover. It is not a mid-stroke clamp or dynamic brake. You can unlock it automatically by supplying air to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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