Airtac SAILB Rear Lock Cylinder SAILB200X225
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB200X225 is a genuine double-acting ISO 15552 profile cylinder with a Ø200mm bore, 225mm 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
- Stroke225 mm
- Port sizeG3/4
- Lock positionBack cover
- Rod threadM36×2
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB200X225
The AirTAC SAILB200X225 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, cutting the release air drives a pin into the carbon steel rod, securely holding the load at the retracted stroke end without requiring live pressure. Delivering a substantial 15708N push force at 0.5MPa, it is built for heavy-duty holding tasks.
The locker end features a 28mm variable air cushion, which is intentionally shorter than the 50mm cushion on the free end to accommodate the locking hardware. For position sensing, adding a magnet allows the use of CMSE reed or DMSE solid-state sensors. Remember the lock engages statically after the piston stops; it is not a dynamic brake for a moving rod.
Airtac SAILB Rear Lock Cylinder SAILB200X225 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB200X225 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø200 mm |
| Stroke | 225 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 SAILB200X225 Is Used
Vertical Lift Holding
Secures heavy lifted platforms in the retracted position automatically upon air loss, preventing sudden drops.
Heavy Clamp Securing
Maintains massive clamping force at the stroke end without consuming continuous compressed air.
Safety Gate Lock
Holds large safety barriers firmly closed at the retracted end until the release air is actively supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB200X225 the Right Lock Cylinder?
Choose this 200mm bore model when an application demands high force alongside fail-safe load holding; if lower force is acceptable, the 160mm bore yields 10053N push at 0.5MPa. Select this SAILB variant to secure loads at the rod-in retracted end, and choose SAILF instead if the extended rod-out end must be held. If your process requires clamping at an arbitrary mid-stroke point rather than a stroke-end stop, select the BSAI clamp-lock cylinder instead.
When integrating this cylinder, never use a fast-exhaust valve, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. The PT tapered port threads and full ISO 15552 mounting interface ensure straightforward replacement. Finally, if human safety depends on the load remaining suspended, always 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 SAILB200X225 FAQ
At 0.5MPa operating pressure, the 200mm bore provides 15708N of push force and 15080N of pull force. At 0.7MPa, the push force increases to 21991N.
The spring-applied, air-released lock engages statically at the retracted stroke end when release air is cut off. It can be unlocked automatically by supplying air to the release port or manually via a lever, but it cannot hold a load at a mid-stroke position.
Related AirTAC Lock & Standard Cylinders
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