Airtac SAILB Rear Lock Cylinder SAILB63X450
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB63X450 is a genuine double-acting ISO 15552 profile cylinder with a Ø63mm bore, 450mm 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
- Stroke450 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM16×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB63X450
The AirTAC SAILB63X450 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. This lock engages automatically when the piston reaches the retracted stroke end, ensuring the load remains securely held without requiring continuous live air pressure. In the 63mm bore class, it generates 1559N of pull force and 2182N of push force at 0.7MPa, making it well-suited for robust vertical holding tasks.
A key design trait of this SAIL model is that the variable air cushion at the locker end is notably shorter at 21mm compared to the 30mm cushion on the free end, ensuring the piston seats correctly for the lock pin to engage. The lock releases automatically via air supply to the release port, or manually via an override lever. For position detection, adding a -S magnet enables the use of AirTAC CMSE reed or DMSE solid-state sensors along the dual-side barrel grooves.
Airtac SAILB Rear Lock Cylinder SAILB63X450 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB63X450 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø63 mm |
| Stroke | 450 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 SAILB63X450 Is Used
Vertical Power-Loss Hold
Maintains a lifted payload securely at the retracted stroke end during pneumatic pressure loss, preventing sudden drops on vertical actuators.
End-of-Stroke Clamping
Secures a workpiece or tooling firmly in the retracted position without consuming continuous air, saving energy during machine pauses.
Gate and Lift Safety
Keeps heavy safety gates or lifting platforms locked in the closed position until the release air is actively supplied to unlock the mechanism.
Is the Airtac SAILB Rear Lock Cylinder SAILB63X450 the Right Lock Cylinder?
Choose this 63mm bore size when your application demands a holding force in the 1559N pull range at 0.5MPa; stepping down to a 50mm bore reduces pull force to 825N, while upgrading to an 80mm bore increases it to 2268N. Select the SAILB configuration specifically when the load must be secured in the retracted, rod-in position. If your setup requires clamping at an arbitrary mid-stroke point rather than the stroke terminal, the BSAI clamp-lock cylinder is the correct alternative.
Because this unit features a 450mm stroke, incorporating external guide rails is highly recommended to prevent excessive side-load wear on the rod and seals. Remember that the SAIL lock is a static holding device that engages only 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 unintentionally release the lock; instead, use an independent-exhaust solenoid valve. If human safety depends on the load remaining elevated, always add an independent mechanical safety measure. Replacement matches require a 63mm bore, 450mm stroke, back locker position, PT port threads, and standard carbon steel rod material.
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 SAILB63X450 FAQ
The 63mm bore provides a push force of 1559N and a pull force of 1402N at 0.5MPa. At 0.7MPa, the push force increases to 2182N, and the pull force reaches 1963N.
The lock is spring-applied and air-released, engaging only when the piston reaches the retracted stroke end in the back cover. It holds statically after the rod stops and is released by supplying air to the release port or by using the manual lever; it does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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