Airtac SAILB Rear Lock Cylinder SAILB100X250S
The AirTAC SAILB Rear Lock Cylinder SAILB100X250S is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 250mm 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.
- BoreØ100 mm
- Stroke250 mm
- Port sizeG1/2
- Lock positionBack cover
- Rod threadM20×1.5
- UnlockAir + manual
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAILB Rear Lock Cylinder SAILB100X250S
The AirTAC SAILB100X250-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, dropping the release air pressure automatically engages a lock pin to hold the rod securely at the retracted stroke end. This 100mm bore generates 5497N of push force at 0.7MPa, making it a robust choice for heavy load-holding tasks.
Equipped with a magnet for position sensing, this model works seamlessly with AirTAC CMSE reed and DMSE electronic switches. The variable air cushion at the locker end is shorter (24mm) than the free end (36mm) to accommodate the locking mechanism. Standard carbon steel rod material and PT tapered ports ensure durable, leak-free pneumatic connections across demanding industrial environments.
Airtac SAILB Rear Lock Cylinder SAILB100X250S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X250S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 250 mm |
| Acting type | Double acting, with lock |
| Port size | G1/2 |
| 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 / 24 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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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 SAILB100X250S Is Used
Vertical Lift Safety
Holds a raised load securely in the retracted position during a power loss, preventing sudden drops without relying on live air pressure.
End-Stroke Clamping
Locks the rod instantly upon reaching the retracted terminal point, maintaining a firm static hold on heavy workpieces during processing.
Gate Holding Mechanism
Secures heavy safety gates or industrial doors in the closed position, releasing automatically only when air is supplied to the release port.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X250S the Right Lock Cylinder?
Choose this 100mm bore when your application requires substantial static holding at the rod-in position; if you need less force, the 80mm bore offers 3518N push at 0.7MPa. Select SAILB for back-cover retracted holding, whereas SAILF holds the extended rod-out position. If your process demands clamping at an arbitrary mid-stroke point rather than the stroke end, step up to the BSAI clamp-lock cylinder instead.
Remember that this lock is a static holding device, not a dynamic brake for moving rods. Valve selection is critical: never use a fast-exhaust valve, and always use an independent-exhaust solenoid valve, because back-pressure on the locker side can inadvertently release the lock. For safety-critical suspended loads, add an independent mechanical safety measure. When replacing this unit, match the 100mm bore, 250mm stroke, back locker position, PT port thread, and -S magnet. With a 250mm stroke, ensure adequate side-load support using external guides to prevent rod binding.
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 SAILB100X250S FAQ
The 100mm bore provides a push force of 5497N at 0.7MPa and 7068N at 0.9MPa. The pull force at 0.7MPa is 3681N. The maximum operating pressure is 1.0MPa.
The lock is spring-applied and air-released, holding the rod only at the retracted stroke end in the back cover. It engages statically after the cylinder stops. To unlock, you supply air to the release port or use the manual release lever. It is not a mid-stroke clamp.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILB Rear Lock Cylinder SAILB100X250S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.