Airtac SAILB Rear Lock Cylinder SAILB63X900
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB63X900 is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm bore, 900mm 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
- Stroke900 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM16×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB63X900
The AirTAC SAILB63X900 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock in the back cover. This lock safely secures the piston rod at the retracted stroke end, ensuring loads remain held without requiring continuous live air pressure. Operating at 0.5 MPa, it generates 1559N of push force and 1402N of pull force.
Because this is a 900 mm stroke, it exceeds standard sizing limits and requires careful attention to side-load guidance to prevent rod binding. The variable air cushion at the locker end is 21 mm, which is shorter than the 30 mm cushion on the free end. For position feedback, adding a -S magnet enables the use of CMSE reed or DMSE electronic sensors.
Airtac SAILB Rear Lock Cylinder SAILB63X900 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB63X900 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 900 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 SAILB63X900 Is Used
Vertical Lift Safety
Holds a raised platform securely in the retracted position during air pressure loss, preventing sudden drops on long-stroke lifts.
Stopper Arm Hold
Locks a 900 mm stopper arm in the retracted terminal position to keep a packaging line clear without consuming continuous air.
Clamp and Secure
Maintains a heavy fixture retracted against gravity when main air supply is shut off, ensuring safe tool changes.
Is the Airtac SAILB Rear Lock Cylinder SAILB63X900 the Right Lock Cylinder?
Choose this 63 mm bore when 50 mm (982N push at 0.5 MPa) is insufficient but 80 mm (2513N) is oversized. Select the SAILB configuration when the load must be secured in the retracted position; choose SAILF if the extended end requires holding. If your application demands locking at an arbitrary mid-stroke position rather than the stroke end, use the BSAI clamp-lock cylinder instead.
The lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Avoid fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; use an independent-exhaust solenoid valve. For safety-critical suspended loads, always add an independent mechanical safety measure. Replacement requires matching the 900 mm stroke, back locker position, 3/8 PT port, and standard mounting.
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 SAILB63X900 FAQ
At 0.5 MPa, the push force is 1559N and the pull force is 1402N. At 0.7 MPa, the push force increases to 2182N.
The spring-applied lock in the back cover engages only at the retracted stroke end to hold the load statically. It unlocks automatically via air release or manually via a lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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