Airtac SAILB Rear Lock Cylinder SAILB100X400
The AirTAC Airtac SAILB Rear Lock Cylinder SAILB100X400 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 SAILB100X400
The AirTAC SAILB100X400 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released mechanical lock housed in the back cover. This safety mechanism engages automatically when the piston reaches the retracted stroke end, securely holding a load in place without requiring continuous live air pressure. Delivering 3927N of push force and 3681N of pull force at 0.5MPa, it handles heavy industrial tasks with ease.
Unlike a standard SAI cylinder, this model ensures power-loss safety by clamping the carbon steel rod at stroke termination. The locker end utilizes a shorter 24mm variable air cushion compared to the 36mm cushion on the free end, specifically tailored to accommodate the locking hardware. Furthermore, the lock can be released automatically via air supply or manually via a lever, providing flexible operation during maintenance.
Airtac SAILB Rear Lock Cylinder SAILB100X400 Technical Specifications
| Model | Airtac SAILB Rear Lock Cylinder SAILB100X400 |
|---|---|
| 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 SAILB100X400 Is Used
Vertical Lift Safety
Holds heavy vertical loads securely in the retracted position during a sudden compressed air loss, preventing uncontrolled drops on lifting machinery.
Pallet Stopper
Locks a heavy pallet or workpiece in place at the end of the conveyor stroke without consuming continuous pneumatic energy.
Clamp and Hold
Maintains high-force clamping pressure on large components at the retracted stroke end, ensuring parts remain fixed during machining or welding.
Is the Airtac SAILB Rear Lock Cylinder SAILB100X400 the Right Lock Cylinder?
Choose this 100mm bore when a 63mm bore (providing 1559N push at 0.5MPa) lacks the thrust for your heavy lifting, but a 125mm bore is physically oversized. The SAILB variant is specified when the load must be secured in the retracted position; if your application requires holding the rod at the extended position, select the SAILF version instead. For applications needing clamping at an arbitrary mid-stroke point rather than at the stroke end, the BSAI clamp-lock cylinder is the correct choice.
Because the lock is a static holding device that engages only after the cylinder has stopped, it cannot brake a moving rod. Never use a fast-exhaust valve with this cylinder; back-pressure on the locker side can inadvertently lift the lock. Always utilize an independent-exhaust solenoid valve. If human safety depends on the load remaining retracted, add an independent safety measure. With a 400mm stroke, ensure adequate external guiding to prevent excessive side-load on the rod. Replacement parts must match the 1/2-inch PT port, 25mm rod diameter, and your chosen mounting style from the full ISO 15552 set including FA, FB, CA, CB, LB, and TC.
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 SAILB100X400 FAQ
At 0.5MPa operating pressure, the 100mm bore provides 3927N of push force and 3681N of pull force. At 0.7MPa, the push force increases to 5497N. The maximum operating pressure is 1.0MPa.
The lock is spring-applied and air-released, located in the back cover. It engages statically only when the piston reaches the retracted stroke end, holding the load without live air. It is released automatically by supplying air to the release port or manually via a lever. It does not clamp at mid-stroke.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac SAILB Rear Lock Cylinder SAILB100X400
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.