Airtac BSAI Locking Clamp Cylinder BSAI40X400
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X400 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 400mm 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
- Stroke400 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 BSAI40X400
The AirTAC BSAI40X400 is a double-acting ISO 15552 profile cylinder featuring a built-in clamp-lock mechanism that secures the load at ANY position along its 400 mm stroke. Driven by filtered air at 0.15-0.7 MPa, it generates 628 N of push thrust at 0.5 MPa. A spring-applied, air-released enclasp grips the 16 mm carbon steel rod, delivering a static holding force of 900 N. It is crucial to distinguish this holding force from the cylinder thrust: the clamp's 900 N rating dictates the static load capacity, whereas the 628 N thrust determines dynamic motion.
The clamp operates via a dedicated G1/8 enclasp port, separate from the 1/4 PT cylinder ports, and unlocks only when air pressures on both sides of the piston are balanced. Remember that the variable air cushion only decelerates the piston near stroke end; the clamp itself is the true holding device. Because the 400 mm stroke is relatively long, the 16 mm rod thread provides a robust interface, but an external guide is recommended to manage side loads over extended travel.
Airtac BSAI Locking Clamp Cylinder BSAI40X400 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X400 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 BSAI40X400 Is Used
Vertical Z-Axis Hold
Prevents gravity-driven drops on vertical strokes by clamping the rod anywhere mid-travel, securing the 900 N load without relying on continuous air pressure.
Power Loss Safety
The spring-applied enclasp engages automatically during an air supply failure, freezing the payload at its exact current position rather than letting it drift.
Machining Position Lock
Holds a workpiece rigidly at a specific intermediate point for drilling or inspection, ensuring the part does not shift under tooling vibration.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X400 the Right Clamp-Lock?
Choose this 40 mm bore model when you need 628 N of thrust at 0.5 MPa and 900 N of static holding capacity mid-stroke. If your application requires less force, the 32 mm bore offers 402 N thrust and 600 N holding force; if you need more, the 50 mm bore provides 982 N thrust and 1400 N holding force. Select this BSAI over a SAIL model when you must lock anywhere along the travel rather than solely at stroke ends, or choose a plain SAI if no clamping is required. This cylinder accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts, uses PT ports, and lacks a standard magnet. For strokes of 400 mm or more, always support the load with an external guide to prevent rod deflection.
Honesty regarding the clamp limits is essential: the lock engages only AFTER the cylinder has stopped, meaning it cannot brake a moving rod. Furthermore, you must balance the air pressure before unlocking, or the rod may jump abruptly. For safety-critical applications where human operators are at risk, always implement an additional independent safety measure.
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 BSAI40X400 FAQ
The clamp-lock provides a static holding force of 900 N. This is separate from the 628 N cylinder thrust, meaning you must size the holding force against the static load weight, not the dynamic thrust.
No, the clamp locks only AFTER the cylinder has stopped; it cannot brake a moving rod. Additionally, it must be unlocked with balanced air pressures to prevent the rod from jumping abruptly.
Related AirTAC Lock & Standard Cylinders
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