Airtac SAILB Rear Lock Cylinder SAILB80X160
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB80X160 is a genuine double-acting ISO 15552 profile cylinder with a Ø80mm bore, 160mm 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
- Stroke160 mm
- Port sizeG3/8
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB80X160
The AirTAC SAILB80X160 is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock housed in the back cover. Because the lock is spring-applied and air-released, it automatically engages a pin into the carbon steel rod when the piston reaches the retracted stroke end. This mechanism secures the load without requiring live pressure, offering a distinct safety advantage over a plain SAI cylinder. Delivering 2513N of push force at 0.5MPa, it handles heavy vertical loads reliably.
This 80mm bore model utilizes a 3/8 PT tapered port and operates at speeds between 30-800mm/s. A notable design 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 lock is a static holding device, not a dynamic brake, meaning it safely engages only after the cylinder has come to a complete stop.
Airtac SAILB Rear Lock Cylinder SAILB80X160 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB80X160 |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø80 mm |
| Stroke | 160 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 SAILB80X160 Is Used
Vertical Power-Off Hold
Prevents gravity-loaded vertical actuators from crashing down when air pressure is lost, using the back cover lock to secure the retracted rod position.
Pallet Lift Station Safety
Holds a raised pallet lifter securely at the top of its stroke end during conveyor indexing or machine downtime without consuming continuous air.
Guard Gate Interlock
Keeps a heavy safety guard gate closed and locked in the retracted position until the machine cycle safely completes and release air is supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB80X160 the Right Lock Cylinder?
Choose this 80mm bore when an application demands substantial load-holding at the retracted stroke end upon power loss. If your system requires less force, stepping down to a 63mm bore yields 1559N of push force at 0.5MPa, whereas upgrading to a 100mm bore provides 3927N. Select the SAILB configuration specifically when the rod must be secured in the retracted position; if the extended position needs holding, the SAILF variant is required instead. For operations needing mid-stroke clamping rather than end-of-stroke holding, the BSAI clamp-lock cylinder is the correct alternative.
When specifying this replacement, verify the 160mm stroke, 3/8 PT port threads, back cover locker position, and standard carbon steel rod. Because the lock relies on a spring mechanism, avoid using fast-exhaust valves; an independent-exhaust solenoid valve is mandatory to prevent back-pressure on the locker side from accidentally releasing the pin. For any safety-critical application where human injury could occur from a dropped load, always add an independent secondary safety measure. At 160mm stroke, side loads are minimal, but ensuring proper mount alignment extends seal life.
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 SAILB80X160 FAQ
At 0.5MPa, this 80mm bore cylinder provides 2513N of push force and 2268N of pull force. At the maximum operating pressure of 0.9MPa, the push force increases to 4523N.
The SAILB80X160 features a spring-applied, air-released lock in the back cover that engages only when the rod reaches the retracted stroke end. It provides a static hold after stopping, not mid-stroke clamping or dynamic braking. 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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