Airtac SAILB Rear Lock Cylinder SAILB63X800S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB63X800S is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm bore, 800mm 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
- Stroke800 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM16×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB63X800S
The AirTAC SAILB63X800-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the back cover. Because the lock is spring-applied and air-released, cutting the release air drives a lock pin into the carbon steel rod, securely holding the load at the retracted stroke end without requiring live pressure. In the 63mm bore class, this actuator generates 1559N of push thrust and 1402N of pull thrust at 0.5MPa, making it well-suited for heavy vertical lifting tasks.
This model includes a magnetic piston (-S) for position detection using AirTAC CMSE reed or DMSE solid-state sensors. The variable air cushion at the locker end is 21mm, intentionally shorter than the 30mm cushion at the free end to accommodate the locking mechanism. You can release the lock automatically by supplying air to the release port, or override it manually via the lever.
Airtac SAILB Rear Lock Cylinder SAILB63X800S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB63X800S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 800 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 SAILB63X800S Is Used
Vertical Lift Safety
Holds elevated loads securely at the retracted stroke end on the back cover side, preventing sudden drops during a power or air loss event.
Pallet Stopper
Locks a stopped load in place at the end of stroke without consuming continuous air pressure, ensuring stable positioning during transfers.
Press Hold
Maintains a clamped retracted position on a fixture securely even when the main air supply is vented, providing reliable workholding.
Is the Airtac SAILB Rear Lock Cylinder SAILB63X800S the Right Lock Cylinder?
Step down to a 50mm bore if your application only requires 825N of pull force at 0.5MPa, or step up to an 80mm bore for 2268N of pull force. Choose this SAILB configuration when the load must be secured in the retracted position; select a SAILF variant instead if the extended end must be held. If your process requires clamping at an arbitrary mid-stroke point rather than a stroke-end hold, use the BSAI clamp-lock cylinder instead.
Remember that this lock is a static holding device that engages after the cylinder stops, not a dynamic brake for a moving rod. Avoid using fast-exhaust valves, as back-pressure on the locker side can inadvertently release the lock; always use an independent-exhaust solenoid valve. For safety-critical suspended loads, add an independent mechanical safety measure. At an 800mm stroke, use a side-load guide to prevent rod deflection. Replacement matches: 63mm bore, 800mm stroke, back locker, PT 3/8 port, standard mounting, and a magnet for sensors.
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 SAILB63X800S FAQ
At 0.5MPa, this 63mm bore cylinder provides 1559N of push thrust and 1402N of pull thrust. At 0.7MPa, the push force increases to 2182N.
The spring-applied, air-released lock engages only at the retracted stroke end to hold the load statically. It unlocks automatically via air supply or manually via a lever. It is not a mid-stroke clamp or a dynamic brake.
Related AirTAC Lock & Standard Cylinders
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