Airtac SAILB Rear Lock Cylinder SAILB160X400S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB160X400S is a genuine double-acting ISO 15552 profile cylinder with a Ø160mm bore, 400mm 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.
- BoreØ160 mm
- Stroke400 mm
- Port sizeG3/4
- Lock positionBack cover
- Rod threadM36×2
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB160X400S
The AirTAC SAILB160X400-S is a double-acting ISO 15552 profile cylinder featuring a built-in mechanical lock in the back cover. Because this lock is spring-applied and air-released, cutting the release air automatically drives a lock pin into the carbon steel rod, securely holding the load at the retracted stroke end without relying on live pressure. Delivering 14074N of push force at 0.7MPa, it is designed for heavy-duty holding tasks.
Unlike a plain SAI cylinder, this model provides true power-loss safety, though the lock engages statically only at the stroke terminal rather than acting as a mid-stroke clamp. The locker end features a shorter 28mm variable air cushion compared to the free end's 50mm cushion, ensuring precise deceleration. Equipped with a magnet, it supports CMSE reed and DMSE solid-state sensors for accurate position feedback.
Airtac SAILB Rear Lock Cylinder SAILB160X400S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB160X400S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø160 mm |
| Stroke | 400 mm |
| Acting type | Double acting, with lock |
| Port size | G3/4 |
| Rod thread | M36×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable (50 mm free end / 28 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 (Ø160mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 10053 N | 9425 N |
| 0.7 MPa | 14074 N | — |
| Max (@1.0 MPa) | 2050 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 SAILB160X400S Is Used
Vertical Power-Off Safety
Holds heavy lifted loads securely at the retracted stroke end during sudden air pressure loss or emergency stops.
Heavy Clamp and Hold
Maintains high clamping force on large workpieces at the stroke terminal without continuously consuming compressed air.
Gate and Door Safety
Locks heavy industrial gates or loading dock doors in the closed position securely until an air signal releases the pin.
Is the Airtac SAILB Rear Lock Cylinder SAILB160X400S the Right Lock Cylinder?
Select this 160mm bore when you need substantial thrust, such as stepping up from a 125mm bore that provides 8590N push at 0.7MPa. Choose the SAILB back-locker variant to hold loads securely at the retracted rod-in position; if your application requires holding at the extended rod-out position, select a SAILF front-locker instead. For applications requiring the load to be clamped at an arbitrary mid-stroke point rather than the stroke end, the BSAI clamp-lock cylinder is the correct choice.
Remember that the lock is a static holding device, not a dynamic brake, so it only engages after the cylinder has stopped. Avoid using fast-exhaust valves, as back-pressure on the locker side can unintentionally release the lock; an independent-exhaust solenoid valve is required. Because human safety may depend on the load staying up, always add an independent safety measure. With a 400mm stroke, ensure external guide shafts are used to manage side loads and prevent rod binding. Replacement matches require a 160mm bore, 400mm stroke, back locker position, PT port threads, 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 SAILB160X400S FAQ
At 0.7MPa operating pressure, this 160mm bore cylinder provides 14074N of push force and 9425N of pull force. It achieves a maximum push force of 18095N at 0.9MPa.
The lock is spring-applied and air-released, engaging statically only when the piston reaches the retracted stroke end in the back cover. It does not clamp at mid-stroke. Unlocking occurs automatically by supplying air to the release port or by using the manual release lever.
Related AirTAC Lock & Standard Cylinders
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