Airtac SAILB Rear Lock Cylinder SAILB80X150
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB80X150 is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm bore, 150mm 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
- Stroke150 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB80X150
The AirTAC SAILB80X150 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. This locking mechanism engages automatically when the piston reaches the retracted stroke end, securely holding the rod in place without requiring continuous live air pressure. It delivers a robust 2513N push force at 0.5MPa, making it well-suited for heavy vertical load-holding tasks.
A key distinction of this SAILB variant is its stroke-end-only static holding capability; it is not a dynamic brake for a moving rod, nor can it clamp at arbitrary mid-stroke positions (which requires a BSAI clamp-lock cylinder). The variable air cushion at the locker end is notably shorter at 22.5mm compared to the 36mm cushion on the free end. To maintain lock integrity, avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock.
Airtac SAILB Rear Lock Cylinder SAILB80X150 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB80X150 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 150 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 SAILB80X150 Is Used
Vertical Load Holding
Maintains heavy raised platforms securely at the retracted stroke end during a power loss, utilizing the back cover mechanical lock to prevent gravity-driven drops.
Safety Gate Hold
Keeps protective machine gates firmly closed and locked at the rod-in position without consuming continuous compressed air, enhancing operator safety.
Clamp and Secure
Holds heavy workpieces in place at the end of the retraction cycle, ensuring components remain clamped firmly even if the main air supply is disconnected.
Is the Airtac SAILB Rear Lock Cylinder SAILB80X150 the Right Lock Cylinder?
Choose this 80mm bore cylinder when an application demands 2513N of thrust at 0.5MPa and a fail-safe hold at the retracted position. If your load requires less force, stepping down to a 63mm bore provides 1559N; if you need significantly more holding power, the 100mm bore offers 3927N. Select SAILB specifically because the load must be secured at the rod-in stroke end, whereas a SAILF variant secures the extended position.
For any mid-stroke clamping requirement, bypass this model entirely and select a BSAI clamp-lock cylinder instead. Remember that this lock is a static holding device engaging only after the cylinder stops. Always pair it with an independent-exhaust solenoid valve to prevent accidental lock release, and add an independent safety measure if human safety depends on the load staying up. Replacement matches require an 80mm bore, 150mm stroke, PT tapered port threads, and the chosen mounting style from the ISO 15552 interface set.
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 SAILB80X150 FAQ
At an operating pressure of 0.5MPa, the SAILB80X150 provides a push force of 2513N and a pull force of 2268N. At 0.7MPa, the push force increases to 3518N.
The lock is spring-applied and air-released, located in the back cover. It engages statically when the piston reaches the retracted stroke end, holding the load 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
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