Airtac SAILB Rear Lock Cylinder SAILB200X25S
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB200X25S is a genuine double-acting ISO 15552 profile cylinder with a Ø200mm bore, 25mm 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
- Stroke25 mm
- Port sizeG3/4
- Lock positionBack cover
- Rod threadM36×2
- UnlockAir + manual
About the Airtac SAILB Rear Lock Cylinder SAILB200X25S
The AirTAC SAILB200X25-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released mechanical lock housed in the back cover. Because the lock engages at the retracted stroke end, it securely holds heavy retracted loads without requiring continuous live air pressure. In the 200 mm bore class, this actuator generates a substantial 15708 N of push force and 15080 N of pull force at 0.5 MPa, making it suitable for massive lifting and holding tasks.
This model includes a magnet for position sensing, working seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches. A notable design detail is that the variable air cushion at the locker end is shorter (28 mm) than the free end (50 mm). The lock itself is a static holding device that engages only after the piston stops at the stroke terminal, rather than acting as a mid-stroke clamp or a dynamic brake for a moving rod.
Airtac SAILB Rear Lock Cylinder SAILB200X25S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB200X25S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø200 mm |
| Stroke | 25 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 SAILB200X25S Is Used
Heavy Press Hold
Secures massive press platens in the retracted position during power loss, utilizing the back cover lock to prevent unintended descent.
Load Retention
Maintains vertical lifting platforms safely at the rod-in stroke end without consuming continuous compressed air.
Safety Gate Lock
Keeps heavy industrial safety gates firmly closed and retracted, engaging the lock only after the piston reaches its terminal stop.
Is the Airtac SAILB Rear Lock Cylinder SAILB200X25S the Right Lock Cylinder?
Choose this 200 mm bore actuator when an application demands extreme force alongside fail-safe load holding in the retracted position. If 15708 N of push at 0.5 MPa exceeds your requirement, stepping down to the 160 mm bore yields 10053 N of push force while maintaining the same 30-500 mm/s speed range. Select the SAILB configuration specifically when the load must be secured at the rod-in position; choose SAILF instead if the extended rod-out position requires holding. If your application requires clamping at an arbitrary mid-stroke point rather than a stroke end, the BSAI clamp-lock cylinder is the correct choice.
For accurate replacement matching, verify the 200 mm bore, 25 mm stroke, back locker position, PT tapered port threads, and the -S magnet option. Crucially, do not use a fast-exhaust valve with this lock cylinder; always utilize an independent-exhaust solenoid valve, as back-pressure on the locker side can inadvertently release the spring-driven lock pin. Furthermore, if human safety depends on the load remaining stationary, an independent mechanical safety measure must supplement the pneumatic lock.
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 SAILB200X25S FAQ
At 0.5 MPa operating pressure, this 200 mm bore cylinder provides 15708 N of push force and 15080 N of pull force. It operates within a speed range of 30-500 mm/s.
The lock is spring-applied and air-released, located in the back cover to hold the rod only at the retracted stroke end. It engages statically after the cylinder stops and can be unlocked automatically via air pressure or manually, but it cannot clamp at a mid-stroke position.
Related AirTAC Lock & Standard Cylinders
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