Airtac SAILB Rear Lock Cylinder SAILB80X500
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB80X500 is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm bore, 500mm 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
- Stroke500 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB80X500
The AirTAC SAILB80X500 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock housed in the back cover. Because this is a SAILB configuration, the spring-applied, air-released lock engages precisely when the piston reaches the retracted stroke end. It delivers a robust 2268N pull force at 0.5 MPa, making it highly capable for heavy load management. The lock is a static holding device that secures the rod after the cylinder stops, rather than acting as a dynamic brake for a moving rod.
A key mechanical detail is that the variable air cushion at the locker end measures 22.5mm, which is intentionally shorter than the 36mm cushion found on the free end. The lock itself relies on a spring to drive a pin into the carbon steel rod, meaning the load remains safely held even if operating pressure drops completely. To release the rod, you supply air to the release port for automatic unlocking, or utilize the manual release lever.
Airtac SAILB Rear Lock Cylinder SAILB80X500 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB80X500 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 500 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 SAILB80X500 Is Used
Vertical Lift Holding
Secures elevated platforms in the retracted position automatically upon power loss, preventing gravity-driven drops.
Clamp and Secure
Holds a machined workpiece firmly at the rod-in stroke end while machining operations complete without live air pressure.
Gate Safety Lock
Keeps heavy access gates locked shut at the closed stroke terminal, requiring an air signal to release the mechanism.
Is the Airtac SAILB Rear Lock Cylinder SAILB80X500 the Right Lock Cylinder?
Select this 80mm bore model when an application requires 2268N of pull force at 0.5 MPa and a secure hold at the rod-in position. If your process demands less force, the 63mm bore offers 1402N of pull at 0.5 MPa; for heavier lifting, stepping up to the 100mm bore provides 3681N. Choose this SAILB variant specifically because the load must be secured at the retracted stroke end. If your fixture requires clamping at an arbitrary mid-stroke point, the BSAI clamp-lock cylinder is the correct choice instead. Always ensure human safety relies on an independent secondary measure, not just the lock.
Valve selection is critical for safe operation: never use a fast-exhaust valve with this cylinder, as back-pressure on the locker side can unintentionally release the lock. Use an independent-exhaust solenoid valve to ensure proper venting. With a 500mm stroke, side-load stress is a real factor; utilize guide rails to prevent rod binding. To match this cylinder for replacement, verify the 80mm bore, 500mm stroke, back locker position, 3/8 PT port, and standard carbon steel rod without a magnet.
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 SAILB80X500 FAQ
At 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 air-released, engaging only at the retracted stroke end. It holds the load statically without live pressure. You can unlock it automatically by supplying air to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILB Rear Lock Cylinder SAILB80X500
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.