Airtac SAILB Rear Lock Cylinder SAILB63X225S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB63X225S is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm 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.
- BoreØ63 mm
- Stroke225 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM16×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB63X225S
The AirTAC SAILB63X225-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. Because the lock engages when the piston reaches the retracted stroke end, it securely holds the rod-in position without requiring continuous live air pressure. In the 63mm bore class, this actuator generates 1559N of push force and 1402N of pull force at 0.5 MPa, utilizing a carbon steel rod for robust load transmission.
Equipped with a magnet (-S), it supports position detection via AirTAC CMSE reed and DMSE electronic sensors. To accommodate the locking hardware, the variable air cushion at the locker end is shortened to 21mm, compared to 30mm on the free end. The unit operates on PT tapered ports sized 3/8, runs at speeds of 30-800mm/s, and unlocks automatically via air pressure or manually via a lever.
Airtac SAILB Rear Lock Cylinder SAILB63X225S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB63X225S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 225 mm |
| Acting type | Double acting, with lock |
| Port size | G3/8 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable (30 mm free end / 21 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 (Ø63mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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 SAILB63X225S Is Used
Vertical Retract Safety
Holds a lifted vertical load securely in the retracted position during a power loss event, preventing gravity-driven drops without needing live air.
End-of-Stroke Clamping
Maintains a static hold on a workpiece at the rod-in terminal, ensuring the payload remains firmly seated while downstream processes occur.
Gate and Guard Locking
Secures safety gates or heavy machine guards in the closed position, releasing automatically only when the system supplies air to the release port.
Is the Airtac SAILB Rear Lock Cylinder SAILB63X225S the Right Lock Cylinder?
Select this 63mm bore model when an application demands 1559N push force at 0.5MPa combined with fail-safe retracted holding; if your load requires less force, the 50mm bore offers 982N, while stepping up to 80mm provides 2513N. Choose this SAILB configuration specifically to secure the rod-in stroke end. If your process requires clamping at an arbitrary mid-stroke point, the BSAI clamp-lock cylinder is the correct alternative, as the SAIL lock only engages at the terminal position.
Remember that this lock is a static holding device, not a dynamic brake for a moving rod. Valve selection is critical: never use a fast-exhaust valve, and always utilize an independent-exhaust solenoid valve, because back-pressure on the locker side can inadvertently release the lock. If human safety depends on the load staying retracted, add an independent safety measure. For drop-in replacements, match the 63mm bore, 225mm stroke, back locker position, 3/8 PT port, and -S magnet across the standard mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, FTC, TCM1, TCM2).
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 SAILB63X225S FAQ
At 0.5 MPa operating pressure, this 63mm bore cylinder provides 1559N of push force and 1402N of pull force. At 0.7 MPa, the push force increases to 2182N.
The spring-applied, air-released lock sits in the back cover and engages statically at the retracted stroke end. It holds the load without live pressure and unlocks via air release or a manual lever; it does not clamp mid-stroke or stop a moving rod.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILB Rear Lock Cylinder SAILB63X225S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.