Airtac SAILB Rear Lock Cylinder SAILB80X50S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB80X50S is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm bore, 50mm 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.
- BoreØ80 mm
- Stroke50 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB80X50S
The AirTAC SAILB80X50-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 consuming live pressure. In this 80mm bore class, the cylinder generates 2513N of push force and 2268N of pull force at 0.5 MPa, making it well-suited for heavy vertical lifting tasks.
A key mechanical detail is that the variable air cushion at the locker end is 22.5mm, intentionally shorter than the 36mm cushion on the free end to accommodate the locking hardware. The -S suffix indicates an integrated magnet compatible with AirTAC CMSE reed and DMSE solid-state sensors for precise end-of-stroke detection. To unlock the rod, you can either supply air to the release port for automatic operation or use the manual release lever.
Airtac SAILB Rear Lock Cylinder SAILB80X50S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB80X50S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 50 mm |
| Acting type | Double acting, with lock |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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 (36 mm free end / 22.5 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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 SAILB80X50S Is Used
Vertical Lift Safety
Holds heavy elevators and lifting platforms securely in the retracted position during a sudden power loss or air pressure drop.
Pneumatic Clamping
Maintains a constant clamping force on heavy workpieces at the rod-in stroke end without continuously consuming compressed air.
Gate and Guard Holding
Secures safety gates and heavy machine guards in the closed position, automatically engaging the lock when the rod reaches the back cover terminal.
Is the Airtac SAILB Rear Lock Cylinder SAILB80X50S the Right Lock Cylinder?
Select this 80mm bore when an application demands 2513N of thrust at 0.5MPa and failsafe holding at the rod-in position; if your force requirements are lower, a 63mm bore provides 1559N, whereas a 100mm bore steps up to 3927N. Choose the SAILB configuration specifically when the load must be secured in the retracted state, and select the SAILF variant instead if the extended end requires holding. If your process demands clamping at an arbitrary mid-stroke point rather than a stroke-end static hold, the BSAI clamp-lock cylinder is the correct alternative.
When integrating this component, strictly avoid fast-exhaust valves and use an independent-exhaust solenoid valve, as back-pressure on the locker side can inadvertently release the spring-driven pin. For safety-critical suspended loads, always add an independent mechanical safety measure. Replacement matches require verifying the 80mm bore, 50mm stroke, PT tapered 3/8 port, back locker position, and the -S magnet option.
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 SAILB80X50S FAQ
At an operating pressure of 0.5 MPa, this 80mm bore cylinder provides 2513N of push force and 2268N of pull force. At 0.7 MPa, the push force increases to 3518N.
The lock is spring-applied and engages automatically when the piston reaches the retracted stroke end in the back cover. It provides a static hold, not a dynamic brake. To unlock the rod, you must supply air to the release port or use the manual release lever.
Related AirTAC Lock & Standard Cylinders
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