Airtac SAILB Rear Lock Cylinder SAILB80X450S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB80X450S is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm 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.
- BoreØ80 mm
- Stroke450 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB80X450S
The AirTAC SAILB80X450-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, it automatically engages to hold the rod securely at the retracted stroke end whenever release air is cut. Delivering 3518N of push force at 0.7MPa, this carbon-rod unit uses a 3/8 PT port and includes a magnetic piston for CMSE or DMSE sensors.
Unlike a plain SAI cylinder, this model retains the load without live pressure, though the variable air cushion at the locker end is intentionally shorter (22.5mm) than the free end (36mm) to house the lock mechanism. The lock is a static holding device that engages after the piston stops, not a dynamic brake for a moving rod.
Airtac SAILB Rear Lock Cylinder SAILB80X450S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB80X450S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 450 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 SAILB80X450S Is Used
Vertical Load Holding
Secures elevated loads at the retracted stroke end during power loss, preventing sudden drops in lifting rigs.
Safety Gate Lock
Holds heavy safety gates firmly in the closed position without relying on continuous air pressure.
Clamp and Hold
Maintains clamping force on heavy fixtures at the end of stroke, saving energy by eliminating constant pressure.
Is the Airtac SAILB Rear Lock Cylinder SAILB80X450S the Right Lock Cylinder?
Step down to a 63mm bore (2182N push at 0.7MPa) if your load is lighter, or move up to a 100mm bore (5497N push at 0.7MPa) for higher thrust. Choose this SAILB configuration when you need the load held at the retracted position; select a SAILF variant if the extended end must be secured. If your application requires locking at an arbitrary mid-stroke point, use a BSAI clamp-lock cylinder instead.
For safe operation, never use a fast-exhaust valve with this lock cylinder, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. At 450mm stroke, use a side-load guide to prevent rod bending. To unlock, supply air to the release port or use the manual override. Always add an independent safety measure if human safety depends on the load staying up.
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 SAILB80X450S FAQ
At 0.7MPa, the 80mm bore provides 3518N of push force and 2268N of pull force. It operates at speeds between 30 and 800mm/s.
The spring-applied, air-released lock engages automatically when the piston reaches the retracted stroke end, holding the load without live pressure. It unlocks via air supply or a manual lever, but it cannot hold at mid-stroke.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILB Rear Lock Cylinder SAILB80X450S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.