Airtac BSAID Clamp Cylinder BSAID125X900
The AirTAC Airtac BSAID Clamp Cylinder BSAID125X900 is a genuine double-acting ISO 15552 cylinder with a Ø125mm 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 8600 N.
- BoreØ125 mm
- Stroke900 mm
- Cylinder portG1/2
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAID Clamp Cylinder BSAID125X900
The AirTAC BSAID125X900 is a double-acting ISO 15552 profile cylinder featuring a double-rod configuration and an integrated clamp-lock mechanism. A spring-applied, air-released gripper clamps the piston rod to secure the load at any position along the 900 mm travel, delivering a static holding force of 8600 N. Because it is a double-rod design, the thrust is equal in both directions at 5734 N (0.5 MPa), and the second rod allows you to mount a workpiece on one end and a guide or position flag on the other.
It is crucial to distinguish this 8600 N static holding force from the cylinder thrust; you must size the clamp capacity against the static load weight, not the push or pull force. The clamp operates via a separate G1/8 enclasp port and requires balanced air pressure to unlock safely. Furthermore, the variable air cushions only decelerate the piston near the stroke ends to prevent impact damage, while the mechanical clamp is the sole device responsible for holding the load.
Airtac BSAID Clamp Cylinder BSAID125X900 Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID125X900 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 mm |
| Type | Double rod (BSAID), 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 | — |
Equal force both directions (double rod). 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 BSAID Clamp Cylinder BSAID125X900 Is Used
Vertical Axis Load Holding
Secures heavy vertical lifting platforms at any intermediate height, preventing gravity-driven drops with 8600 N of static holding force.
Emergency Power-Loss Hold
Spring-applied clamp engages instantly upon air loss, freezing the 900 mm stroke position to protect operators and tooling.
Machining Position Lock
Uses the dual-rod design to mount a machining head on one side and a counterweight on the other, locking the assembly rigidly for processing.
Is the Airtac BSAID Clamp Cylinder BSAID125X900 the Right Clamp-Lock?
Choose this 125 mm bore when an application demands high load holding mid-stroke, stepping up from a 100 mm bore that provides 3681 N thrust and 5500 N holding force. If securing the load only at the fully extended or retracted position is sufficient, a plain SAI or SAIL cylinder suffices, but the BSAI/BSAID series is required for true lock-anywhere functionality. Remember that the clamp locks only after the rod has stopped, it cannot brake a moving load, and safety-critical applications require an independent external safety measure.
To replace this unit, match the double-rod configuration, 125 mm bore, 900 mm stroke, PT port threads, and the 1/2 inch cylinder ports. The BSAID mounting set omits FB, CA, CB, and CR brackets, accepting only Basic, FA, LB, TC, TCM1, and TCM2 styles. Because the stroke is 900 mm, the large 32 mm rod and M27x2 thread provide excellent side-load resistance, but an external guide is still recommended for unsupported lengths. Sensors are not included, but the -S magnet option supports AirTAC CMSE reed and DMSE electronic switches.
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 BSAID Clamp Cylinder BSAID125X900 FAQ
The integrated clamp-lock provides a static holding force of 8600 N. It engages a spring-applied gripper on the rod to hold the load at any position along the 900 mm stroke, operating independently of the 5734 N cylinder thrust.
The clamp locks only after the cylinder has stopped and cannot brake a moving rod. To release it safely, air pressure must be balanced on both sides of the piston via the G1/8 enclasp port; otherwise, the rod may jump abruptly. Safety-critical loads require an additional independent safety measure.
Related AirTAC Lock & Standard Cylinders
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