Airtac SAILB Rear Lock Cylinder SAILB63X175
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB63X175 is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm 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.
- BoreØ63 mm
- Stroke175 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM16×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB63X175
The AirTAC SAILB63X175 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock housed in the back cover. A spring-applied, air-released lock engages when the piston reaches the retracted stroke end, ensuring the load is held securely without relying on live air pressure. Delivering a pull force of 1402N at 0.5MPa, this carbon steel rod unit provides robust power-failure safety.
Unlike a standard SAI cylinder, this model integrates variable air cushions at both ends, but the locker-end cushion is notably shorter at 21mm compared to 30mm on the free end. The lock releases automatically via air supply or manually via a lever, but avoid fast-exhaust valves as back-pressure can unintentionally release the lock.
Airtac SAILB Rear Lock Cylinder SAILB63X175 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB63X175 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 175 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 SAILB63X175 Is Used
Vertical Lift Hold
Secures elevated loads in the retracted position during power loss, preventing sudden drops on lifting machinery.
Safety Gate Lock
Holds safety barriers firmly closed at the rod-in stroke end until air is supplied to release the lock.
Clamp and Hold
Maintains clamping force on machined parts at the retracted terminal without consuming continuous air pressure.
Is the Airtac SAILB Rear Lock Cylinder SAILB63X175 the Right Lock Cylinder?
Choose this 63mm bore if your application demands 1402N of pull force at 0.5MPa; step down to a 50mm bore for 825N pull, or up to an 80mm bore for 2268N pull. Select the SAILB configuration when the load must be held at the rod-in retracted position. If your process requires locking at an arbitrary mid-stroke point rather than the stroke end, select the BSAI clamp-lock cylinder instead. Keep in mind this is a static holding lock that engages after the cylinder stops, not a dynamic brake for a moving rod.
For replacements, verify the 175mm stroke, 3/8 PT port, and back locker position. Because no magnet is specified, position sensing requires adding a -S variant to support CMSE reed or DMSE electronic sensors. Always use an independent-exhaust solenoid valve to prevent locker-side back-pressure, and add independent safety measures if human safety depends on the suspended load.
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 SAILB63X175 FAQ
At 0.5MPa, the 63mm bore provides 1559N of push force and 1402N of pull force. At 0.7MPa, the push force is 2182N and the pull force is 2805N.
The lock is spring-applied and air-released, engaging statically only when the piston reaches the retracted stroke end in the back cover. It unlocks automatically via air supply or manually via a lever, but it cannot clamp at an arbitrary mid-stroke position.
Related AirTAC Lock & Standard Cylinders
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