Airtac BSAI Locking Clamp Cylinder BSAI125X450
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X450 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 450mm 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 8600 N.
- BoreØ125 mm
- Stroke450 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
- 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 BSAI125X450
The AirTAC BSAI125X450 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released clamp-lock mechanism. It secures the carbon steel piston rod at any position along its 450mm travel, delivering a static holding force of 8600 N. Operating within 0.15-0.7 MPa, it generates 6136 N of push thrust at 0.5 MPa. It is crucial to distinguish this holding force from thrust: the 8600 N clamp rating dictates the static load capacity when stationary, whereas the 6136 N figure represents the pneumatic movement force.
This enclasp unit requires a third G1/8 unlock port alongside its 1/2 inch PT cylinder ports. The clamp is bidirectional and engages only after the rod stops, meaning it cannot brake a moving load. Additionally, the variable air cushion at the stroke ends merely decelerates the piston; the mechanical clamp is the sole device responsible for holding the load securely in place.
Airtac BSAI Locking Clamp Cylinder BSAI125X450 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X450 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/2 |
| Rod thread | M27×2 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 8600 N |
| Enclasp / unlock port | G1/8 |
| Operating pressure | 0.15 – 0.7 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Max stroke | Up to 1000 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 (Ø125 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa (max) | 8590 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (8600 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI125X450 Is Used
Vertical Load Holding
Maintains a 8600 N vertical load securely at any height along the 450mm stroke, preventing gravity-induced drops during air pressure loss.
Emergency Power-Loss Hold
Spring-applied clamp engages instantly once the rod stops, locking heavy platens safely in place anywhere in the travel during an unexpected outage.
Machining Position Retention
Secures a heavy workpiece fixture at the exact required coordinate for machining or inspection, operating entirely independent of the air cushions.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X450 the Right Clamp-Lock?
Select this 125mm bore model when an application demands high load retention mid-stroke, stepping up from the 100mm bore which offers 3927 N thrust and 5500 N holding force. Choose this BSAI over a SAIL variant when you need to enclasp the rod anywhere along the travel, rather than just holding at the stroke end. If no mid-stroke holding is required, a plain SAI cylinder suffices. For safety-critical loads, remember the clamp locks only after the cylinder stops, and unlocking requires balanced air pressures to prevent the rod from jumping abruptly.
This single-rod configuration utilizes a robust M27x2 rod thread, providing excellent side-load capacity for heavy tooling. Given the 450mm stroke, an external guide rail is recommended to support the rod and prevent deflection. It supports BSAI mountings including Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. As no magnet is specified, it will not support CMSE or DMSE sensors without modification.
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 BSAI125X450 FAQ
The clamp-lock provides a static holding force of 8600 N. It is bidirectional and can secure the rod at any position along the 450mm stroke, but only after the cylinder has come to a complete stop.
The spring-applied clamp is released via air pressure through a third G1/8 port. To prevent the rod from jumping abruptly, the air pressures on both sides of the piston must be balanced before unlocking, and an independent safety measure is required for human-safety applications.
Related AirTAC Lock & Standard Cylinders
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