Airtac SAILB Rear Lock Cylinder SAILB200X150S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB200X150S is a genuine double-acting ISO 15552 profile cylinder with a Ø200mm 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.
- BoreØ200 mm
- Stroke150 mm
- Port sizeG3/4
- Lock positionBack cover
- Rod threadM36×2
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB200X150S
The AirTAC SAILB200X150-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, cutting the release air automatically drives a lock pin into the carbon steel piston rod, securely holding the load at the retracted stroke end without requiring live pressure. In this 200mm bore configuration, the cylinder generates a substantial 15708N of push force and 15080N of pull force at 0.5 MPa, making it suited for heavy-duty holding tasks. The integrated -S magnet pairs seamlessly with AirTAC CMSE reed and DMSE solid-state sensors for precise end-position detection.
Unlike a standard SAI cylinder, the SAIL series provides true static load-holding upon power loss. It is critical to note that the lock engages only after the piston reaches the stroke terminal on the locker side, rather than clamping at an arbitrary mid-stroke point. Additionally, the variable air cushion at the locker end measures 28mm, which is shorter than the 50mm cushion at the free end, ensuring proper deceleration without interfering with the lock mechanism. Unlocking is achieved automatically by supplying air to the release port or by using the manual release lever.
Airtac SAILB Rear Lock Cylinder SAILB200X150S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB200X150S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø200 mm |
| Stroke | 150 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 (Ø200mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 15708 N | 15080 N |
| 0.7 MPa | 21991 N | — |
| Max (@1.0 MPa) | 3204 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 SAILB200X150S Is Used
Heavy Vertical Lift Hold
Maintains heavy lifted platforms securely in the retracted position during a complete pneumatic power loss, utilizing the spring-applied back cover lock.
Press Safety Arrestor
Provides a fail-safe static hold for heavy press rams at the retracted stroke end, preventing gravity-driven falls when air pressure is removed.
Heavy Machinery Clamping
Delivers 15708N of clamping force at 0.5 MPa and locks upon reaching the stroke terminal, securing large industrial workpieces without live air consumption.
Is the Airtac SAILB Rear Lock Cylinder SAILB200X150S the Right Lock Cylinder?
Select this 200mm bore model when an application demands immense force and guaranteed load retention at the retracted rod-in position. If your system requires holding the load at the extended rod-out position instead, the SAILF200X150 variant is the correct choice. For operations that need to secure the load at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder should be used instead of the SAIL series. To match this component for replacement, verify the 200mm bore, 150mm stroke, back locker position, PT tapered port threads, and the -S magnet option.
Because the lock is a static holding device and not a dynamic brake, it must engage only after the cylinder has completely stopped moving. Valve selection is a critical red-line: never use a fast-exhaust valve with this lock cylinder, as back-pressure on the locker side can inadvertently release the lock; always use an independent-exhaust solenoid valve. If human safety depends on the load remaining suspended, an additional independent safety measure must be installed. Although 150mm is below the 300mm side-load threshold, always ensure proper mounting alignment using the full suite of ISO 15552 mounting options.
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 SAILB200X150S FAQ
At a standard operating pressure of 0.5 MPa, this 200mm bore cylinder generates 15708N of push force and 15080N of pull force. At the maximum 1.0 MPa operating pressure, it can deliver up to 3204 kgf.
The lock is spring-applied and air-released, meaning it automatically engages to hold the rod at the retracted stroke end when release air is cut off. It is a static hold only, not a mid-stroke clamp or dynamic brake. You can unlock it by supplying air to the release port or by using the manual release lever, but back-pressure from fast-exhaust valves must be avoided.
Related AirTAC Lock & Standard Cylinders
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