Airtac BSAI Locking Clamp Cylinder BSAI40X225
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X225 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 225mm stroke and a spring-applied, air-released clamp-lock that holds the rod at ANY position along its travel — with a static holding force of 900 N.
- BoreØ40 mm
- Stroke225 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM12×1.25
- 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 BSAI Locking Clamp Cylinder BSAI40X225
The AirTAC BSAI40X225 is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. A defining feature of this series is its ability to lock the piston rod at ANY position along the 225 mm stroke, rather than only at the end of travel. The integrated enclasp gripper provides a bidirectional static holding force of 900 N. Operating at 0.15-0.7 MPa, the 40 mm bore generates 628 N of push thrust and 528 N of pull thrust at 0.5 MPa. You must size the 900 N holding capacity against your static load, as the clamp holding force is a distinct quantity separate from the cylinder thrust.
This model uses a PT 1/4 cylinder port and a separate G1/8 enclasp unlock port. The clamp mechanism relies on a third air port to release the spring-loaded grip, meaning the lock engages automatically upon air loss but requires balanced cylinder pressures to unlock safely. It is critical to note that the variable air cushions at the stroke ends only decelerate the piston; the clamp is the sole device responsible for holding the load. The standard carbon steel rod features an M12x1.25 thread, providing a robust interface for mounting. Because this unit lacks a magnet, position sensing requires external switches or a modified configuration.
Airtac BSAI Locking Clamp Cylinder BSAI40X225 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X225 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/4 |
| Rod thread | M12×1.25 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 900 N |
| Enclasp / unlock port | G1/8 |
| Operating pressure | 0.15 – 0.7 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Max stroke | Up to 800 mm |
Specifications follow the official AirTAC BSAI datasheet (ISO 15552). Operating pressure is 0.15–0.7 MPa (lower than a plain SAI). Port options: PT / G.
How the Clamp-Lock Holds
static holding force (Ø40 mm)
A spring-applied gripper clamps the rod and holds the load at any position in the stroke — not just at the stroke end (that is a SAIL) — and it is bidirectional: it holds whether the rod was extending or retracting.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa (max) | 880 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (900 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI40X225 Is Used
Vertical Axis Hold
Secures a 40 mm bore vertical lift at any intermediate height, using the 900 N clamp to prevent gravity-driven drops during an air pressure loss.
Emergency Drop Prevention
Acts as a fail-safe lock anywhere across the 225 mm stroke, engaging automatically when supply pressure is removed to protect operators and tooling.
Machining Position Lock
Freezes the rod at a specific mid-stroke coordinate for machining or inspection, ensuring the workpiece remains entirely rigid without relying on live air pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X225 the Right Clamp-Lock?
Choose the BSAI40X225 when an application requires intermediate stopping or emergency holding anywhere in the 225 mm travel. If your load only needs to be held at the fully retracted or extended position, a plain SAI cylinder or a SAIL stroke-end lock provides a simpler solution. If the 900 N holding force is insufficient for a heavier vertical load, stepping up to the 50 mm bore offers a 1400 N holding capacity and 982 N thrust at 0.5 MPa. Conversely, lighter duties can use the 32 mm bore with its 600 N holding force and 402 N thrust.
The clamp locks only after the cylinder has stopped; it cannot brake a moving rod. Furthermore, you must balance the air pressures on both sides of the piston before releasing the clamp, otherwise the rod may jump abruptly. For safety-critical applications, an independent external measure is required. This cylinder accepts PT port threads and mounts via Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, or TCM2 brackets. The 225 mm stroke is within standard limits, but the M12x1.25 carbon steel rod should still be guided externally if subjected to significant side loads.
Quick checklist
- ✓ Hold needed at any position?
- ✓ Or stroke-end only → use SAIL
- ✓ Holding force ≥ your load
- ✓ Balanced-pressure unlock circuit
- ✓ Extra safety measure for people
Airtac BSAI Locking Clamp Cylinder BSAI40X225 FAQ
The BSAI40X225 features a bidirectional static holding force of 900 N. This spring-applied, air-released clamp can secure the load at any position along the 225 mm stroke, but it is distinct from the 628 N thrust generated by the cylinder itself.
The clamp unlocks via a separate G1/8 port, but only after the cylinder has stopped and the air pressures on both sides of the piston are balanced. If pressures are not balanced, the rod can move abruptly upon release. It also cannot brake a moving rod, as it only locks after the cylinder has stopped.
Related AirTAC Lock & Standard Cylinders
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