Airtac BSAI Locking Clamp Cylinder BSAI40X350
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X350 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 350mm 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
- Stroke350 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 BSAI40X350
The AirTAC BSAI40X350 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It secures the carbon steel piston rod at any position along its 350mm travel, delivering a static holding force of 900 N. Because the rod locks bidirectionally, it safely holds loads whether the cylinder was extending or retracting. The base cylinder generates 628 N of thrust at 0.5 MPa and 879 N at 0.7 MPa. It is vital to distinguish holding force from thrust: the 900 N clamp rating is the measure of static load retention, completely separate from the pneumatic push force, so you must size the clamp against the dead weight of the load.
This enclasp mechanism operates via a dedicated G1/8 third port, requiring 0.15-0.7 MPa of unlock pressure to release the spring grip. Remember that the variable air cushion at the stroke ends only decelerates the piston to prevent impact; the mechanical clamp is the sole device holding the load. The clamp locks only after the rod has stopped, meaning it cannot brake a moving load. Furthermore, unlocking requires balanced air pressures on both sides of the piston, or the rod may jump abruptly upon release.
Airtac BSAI Locking Clamp Cylinder BSAI40X350 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X350 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 BSAI40X350 Is Used
Vertical Axis Hold
Prevents a 40mm bore vertical load from dropping under gravity by clamping the rod securely at any intermediate height during a power loss.
Mid-Stroke Machining
Locks the workpiece at a precise 350mm travel point for machining or inspection, ensuring zero movement without relying on live air pressure.
Assembly Pause
Holds the carbon steel rod rigidly in place during an assembly process pause, providing a stable 900 N anchor wherever the process stopped.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X350 the Right Clamp-Lock?
Choose this 40mm bore when an application requires mid-stroke holding that a standard SAIL cannot provide, since SAIL only locks at stroke ends. If your load exceeds 900 N, step up to the 50mm bore, which offers a 1400 N holding force and 982 N thrust at 0.5 MPa. If no intermediate locking is needed, a plain SAI40 cylinder suffices. For this 350mm stroke, the 16mm rod and M12x1.25 thread provide good side-load capacity, but because the stroke is over 300mm, an external guide rail is recommended to prevent rod deflection.
To replace this unit, match the single-rod configuration, 40mm bore, 350mm stroke, and PT port threads. The cylinder ports are 1/4, and the enclasp port is G1/8. Mounting options include Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. As no magnet is specified, position sensing via CMSE or DMSE sensors is not available. Always ensure the cylinder has stopped before applying the clamp, and add an independent safety measure for human-safety-critical 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 BSAI40X350 FAQ
The BSAI40X350 provides a static holding force of 900 N. It locks at any position along the stroke, but it only engages after the cylinder has stopped moving and cannot be used as a braking device.
The clamp is released by supplying 0.15-0.7 MPa to the G1/8 enclasp port. To prevent the rod from jumping abruptly, the air pressures on both sides of the piston must be balanced before unlocking.
Related AirTAC Lock & Standard Cylinders
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