Airtac BSAI Locking Clamp Cylinder BSAI40X900
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X900 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 900mm 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
- Stroke900 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 BSAI40X900
The AirTAC BSAI40X900 is a double-acting ISO 15552 profile cylinder featuring a built-in clamp-lock mechanism. A spring-applied, air-released gripper clamps the 16 mm carbon steel rod to secure the load at any position along its 900 mm travel. It delivers a static holding force of 900 N, while the cylinder thrust is 628 N pushing and 528 N pulling at 0.5 MPa. You must size the holding force against the static load, as the clamp force is entirely separate from the cylinder thrust.
This model uses a third G1/8 enclasp port to release the lock, requiring a balanced air pressure between 0.15 and 0.7 MPa to unlock safely. The variable air cushions at both ends only decelerate the piston near stroke end; the mechanical clamp is the sole device holding the load. Note that the clamp locks only after the rod has stopped, meaning it cannot brake a moving load.
Airtac BSAI Locking Clamp Cylinder BSAI40X900 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X900 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 900 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 BSAI40X900 Is Used
Vertical Axis Intermediate Hold
Secures a vertically lifted payload at any point along the 900 mm travel, preventing drops during an air pressure loss without relying on end-of-stroke stops.
Machining Position Lock
Clamps the rod rigidly with 900 N of holding force to keep a workpiece stationary for drilling or inspection, ensuring the load does not shift under vibration.
Emergency Drop Prevention
Acts as a fail-safe gripper that engages only after the cylinder stops, holding the load securely in place when the main air supply is interrupted.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X900 the Right Clamp-Lock?
Choose this BSAI40X900 when you need to secure a load at an intermediate stroke position, unlike a SAIL cylinder which only locks at the stroke end. If your application only requires end-of-stroke holding, a plain SAI40 cylinder is sufficient. If you need higher intermediate holding capacity, stepping up to a 50 mm bore provides a 1400 N clamp force and 982 N push thrust at 0.5 MPa. Because the 900 mm stroke exceeds the 800 mm standard maximum for a 40 mm bore, this is a non-standard stroke that requires an external guide to prevent excessive side loading on the rod.
For safe operation, ensure the cylinder has stopped completely before applying the clamp, and balance the air pressure before unlocking to prevent the rod from jumping abruptly. Safety-critical applications require an additional independent safety measure. This configuration features PT tapered ports, a standard carbon steel rod, and no magnet. It supports BSAI mounting sets including Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2.
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 BSAI40X900 FAQ
The BSAI40X900 provides a static holding force of 900 N. This bidirectional clamp holds the load at any position along the stroke, but it only engages after the cylinder has stopped and cannot brake a moving rod.
The clamp is released by applying air to the third G1/8 enclasp port. You must balance the air pressure on both sides of the piston before unlocking, otherwise the rod can move abruptly. Human-safety applications require an additional independent safety measure.
Related AirTAC Lock & Standard Cylinders
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