Airtac SAILB Rear Lock Cylinder SAILB200X175
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB200X175 is a genuine double-acting ISO 15552 profile cylinder with a Ø200mm bore, 175mm 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
- Stroke175 mm
- Port sizeG3/4
- Lock positionBack cover
- Rod threadM36×2
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB200X175
The AirTAC SAILB200X175 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock built into the back cover. This robust 200mm bore design generates 15708N of push force and 15080N of pull force at 0.5MPa, making it suitable for heavy-duty load control. Because the lock engages automatically when the piston reaches the retracted stroke end, the rod remains safely held without requiring continuous live air pressure. A manual release lever provides immediate local unlocking, while applying air to the release port handles automatic operation.
This model features a carbon steel rod and a PT tapered port thread. The extruded aluminum barrel includes sensor grooves on both sides, compatible with CMSE reed and DMSE electronic sensors if a magnet is added later. A notable design detail is the variable air cushion: the locker end utilizes a 28mm cushion stroke, which is intentionally shorter than the 50mm cushion stroke found at the free end to accommodate the locking mechanism.
Airtac SAILB Rear Lock Cylinder SAILB200X175 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB200X175 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø200 mm |
| Stroke | 175 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 SAILB200X175 Is Used
Heavy Vertical Lift Hold
Secures heavy elevated platforms or lifting tables in the retracted position instantly upon air loss, preventing sudden drops during power failure.
Press Safety Hold
Maintains clamping force on heavy press equipment at the stroke end without consuming continuous compressed air, ensuring stable positioning.
Machine Guard Positioning
Locks large safety doors or heavy machine guards in the closed position securely, requiring an active air signal to release and open.
Is the Airtac SAILB Rear Lock Cylinder SAILB200X175 the Right Lock Cylinder?
Choose this 200mm bore size when a 160mm cylinder (providing 10053N push at 0.5MPa) cannot meet your thrust requirements, but ensure your framework can support the larger footprint and 3/4-inch ports. Select the SAILB configuration specifically when the load must be secured in the retracted position; for holding an extended load, the SAILF variant is required. If your application demands clamping at an arbitrary mid-stroke point rather than a stroke-end hold, the BSAI clamp-lock cylinder is the correct choice.
Remember that this is a static holding lock that engages after the cylinder stops, not a dynamic brake for a moving rod. Valve selection is critical: never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can unintentionally release the lock. Always use an independent-exhaust solenoid valve. For any human-safety application where a load stays suspended, add an independent mechanical safety measure beyond the pneumatic lock.
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 SAILB200X175 FAQ
At 0.5MPa operating pressure, this 200mm bore cylinder provides 15708N of push force and 15080N of pull force. At the maximum 1.0MPa pressure, it achieves a maximum push force of 3204kgf.
The lock is spring-applied and air-released, located in the back cover. It engages automatically to hold the rod at the retracted stroke end when pressure is cut, and it is a static hold, not a dynamic brake. Unlocking is done via an air signal to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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