Airtac SAILB Rear Lock Cylinder SAILB100X400S
The AirTAC SAILB Rear Lock Cylinder SAILB100X400S is a genuine double-acting ISO 15552 profile cylinder with a Ø100mm 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.
- BoreØ100 mm
- Stroke400 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 SAILB100X400S
The AirTAC SAILB100X400-S is a double-acting ISO 15552 profile cylinder with a built-in mechanical lock housed in the back cover. It delivers 3927N of push force at 0.5MPa and features a 25mm carbon steel rod with an M20x1.5 thread. The lock is spring-applied and air-released: removing the release air drives a lock pin into the rod, securely holding the load at the retracted stroke-end without requiring live pressure. To unlock, you simply supply air to the release port or use the manual override lever.
This 100mm bore variant includes a magnet for position sensing, working seamlessly with AirTAC CMSE reed and DMSE electronic solid-state switches. Because the lock occupies one end, the variable air cushion at the locker end is shorter (24mm) compared to the 36mm cushion on the free end. The cylinder accepts filtered air up to 1.0MPa and operates at speeds between 30-800mm/s, utilizing PT tapered port threads.
Airtac SAILB Rear Lock Cylinder SAILB100X400S Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X400S |
|---|---|
| Series | SAIL ISO 15552 cylinder with lock |
| Bore size | Ø100 mm |
| Stroke | 400 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 SAILB100X400S Is Used
Vertical Lift Safety
Holds a raised platform securely at the retracted stroke-end during a power loss, preventing gravity-driven drops without needing continuous air pressure.
Clamp and Hold
Maintains a locked retracted state on a clamping mechanism after the cylinder finishes its stroke, ensuring the workpiece stays secured.
Gate Safety Stop
Acts as a fail-safe mechanical stop for heavy safety gates, keeping the rod locked in the retracted position until air is actively supplied.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X400S the Right Lock Cylinder?
Choose this SAILB model when your application requires a fail-safe hold specifically at the retracted rod-in position. If you need to hold the load at the extended position instead, select the SAILF variant. If your process demands locking at an arbitrary mid-stroke point rather than a stroke-end terminal, the BSAI clamp-lock cylinder is the correct choice. The SAIL lock is a static holding device that engages after the rod stops; it is not a dynamic brake for a moving load.
For valve selection, avoid fast-exhaust valves and use an independent-exhaust solenoid valve, as back-pressure on the locker side can unintentionally lift the lock. If human safety depends on the load remaining elevated, always add an independent safety measure. When replacing this unit, match the 100mm bore, 400mm stroke, back locker position, PT ports, and the -S magnet. Given the 400mm stroke, ensure external guides are used to manage side loads and 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 SAILB100X400S FAQ
At 0.5MPa, the push force is 3927N and the pull force is 3681N. At 0.7MPa, the push force increases to 5497N. The maximum allowable operating pressure is 1.0MPa.
The lock is spring-applied and engages automatically when the piston reaches the retracted stroke-end, holding the rod without live air. To release the lock, you supply air to the release port or use the manual release lever. It only holds at the stroke-end terminal, not at mid-stroke.
Related AirTAC Lock & Standard Cylinders
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