Airtac SAILB Rear Lock Cylinder SAILB100X225S
The AirTAC SAILB Rear Lock Cylinder SAILB100X225S is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm bore, 225mm 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
- Stroke225 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 SAILB100X225S
The AirTAC SAILB100X225-S is a double-acting ISO 15552 profile cylinder with a built-in mechanical lock in the back cover. A spring-applied, air-released lock engages when the piston reaches the retracted stroke end, securely holding the load without requiring live air pressure. In this 100mm bore configuration, it generates 3927N of push force at 0.5MPa and features a carbon steel rod with a PT tapered port thread. The -S magnet enables position detection using CMSE reed or DMSE electronic solid-state switches.
Because the lock occupies the back end, the variable air cushion on that side is shorter at 24mm compared to the 36mm cushion on the free end. The lock provides a static hold after the cylinder stops; it is not a dynamic brake for moving rods. To release the lock, supply air to the release port for automatic operation or use the manual release lever.
Airtac SAILB Rear Lock Cylinder SAILB100X225S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X225S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 225 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 SAILB100X225S Is Used
Vertical Lift Holding
Prevents gravity-driven drops on vertical lifts by mechanically locking the rod in the retracted position during a power loss event.
Clamp and Hold
Maintains secure clamping force at the retracted stroke end without consuming continuous compressed air.
Safety Gate Lock
Keeps heavy safety gates and machine guards closed and locked at the end of stroke until the release air is actively supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X225S the Right Lock Cylinder?
Choose this SAILB model when your application requires the load to be held securely at the retracted rod-in position. If you need to hold the load at the extended position, select the SAILF front-locker variant instead. For applications requiring mid-stroke clamping at an arbitrary position, the BSAI clamp-lock cylinder is the correct choice, as the SAIL lock only engages at the stroke terminal. If you need higher force, stepping up to the 125mm bore yields 6136N at 0.5MPa; dropping to the 80mm bore provides 2513N.
When integrating this cylinder, never use a fast-exhaust valve, as back-pressure on the locker side can unintentionally release the lock. Always use an independent-exhaust solenoid valve. If human safety depends on the load staying up, add an independent safety measure. For replacement matching, verify the 100mm bore, 225mm stroke, back locker position, PT port thread, and the -S magnet. Given the 225mm stroke, ensure proper guide support to mitigate side-load wear.
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 SAILB100X225S FAQ
The 100mm bore generates 3927N of push force and 3681N of pull force at 0.5MPa. At 0.7MPa, the push force increases to 5497N.
The lock is spring-applied and air-released, holding the rod statically only at the retracted stroke end. It does not clamp mid-stroke. You can unlock it automatically by supplying release air or manually via the lever.
Related AirTAC Lock & Standard Cylinders
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