Airtac BSAID Clamp Cylinder BSAID125X900S
The AirTAC Airtac BSAID Clamp Cylinder BSAID125X900S 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 BSAID125X900S
The AirTAC BSAID125X900-S is a double-acting ISO 15552 extruded aluminum profile cylinder featuring a double-rod configuration and a built-in clamp-lock mechanism. A spring-applied, air-released gripper clamps the piston rod to secure the load at any position along its 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, providing 5734 N of push and pull force at 0.5 MPa. It is crucial to distinguish this 8600 N holding force from the cylinder's thrust; you must size the clamp's holding capacity against the static load, not the pneumatic drive force.
This model includes a -S magnet for precise position sensing with AirTAC CMSE reed and DMSE electronic switches. The clamp relies on a third G1/8 enclasp port to release the rod, requiring an unlock pressure between 0.15 and 0.7 MPa. Remember that the variable air cushions at both ends only decelerate the piston near stroke end; the mechanical clamp is the sole device responsible for holding the load. The double-rod layout allows mounting a workpiece on one end and a counterweight or position flag on the opposite end, delivering dual-side guidance and anti-rotation benefits.
Airtac BSAID Clamp Cylinder BSAID125X900S Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID125X900S |
|---|---|
| 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 BSAID125X900S Is Used
Vertical Load Holding
Secures heavy vertical platens at any point in the 900 mm travel using 8600 N of holding force, preventing drops during air pressure loss.
Machining Position Hold
Locks a dual-sided workpiece rigidly in place for machining or inspection, using the double-rod design to prevent torsional rotation.
Emergency Mid-Stroke Stop
Freezes the load exactly where it stops during an E-stop, maintaining position without relying on live air pressure.
Is the Airtac BSAID Clamp Cylinder BSAID125X900S the Right Clamp-Lock?
Choose this 125 mm bore double-rod model when an application demands substantial equal bidirectional thrust and extreme holding capacity. If the 8600 N holding force is excessive or the 5734 N thrust at 0.5 MPa is too high, stepping down to an 80 mm bore provides 2268 N of pull force and a 3600 N clamp hold. Select this BSAID clamp-lock over an AirTAC SAIL cylinder when you need to lock the load at any intermediate stroke position rather than just at the end of travel. If mid-stroke holding is unnecessary, a plain SAID double-rod cylinder suffices.
For safe operation, the clamp locks only after the rod has completely stopped; it cannot brake a moving load. The rod must be unlocked with balanced air pressures on both sides of the piston to prevent abrupt movement upon release. For safety-critical applications, an additional independent safety measure is required. This configuration uses PT tapered threads, a 1/2 inch cylinder port, and an M27x2 rod thread. The large 32 mm rod handles high side loads, but the 900 mm stroke still necessitates an external guide to prevent binding. It supports Basic, FA, LB, TC, TCM1, and TCM2 mounts, omitting FB, CA, CB, and CR styles.
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 BSAID125X900S FAQ
It uses a spring-applied, air-released gripper that clamps the rod to hold the load at any position with an 8600 N static force. It only engages after the cylinder has stopped and cannot brake a moving rod.
The clamp is released via a third G1/8 enclasp port, but only after the air pressures on both sides of the piston are balanced. Releasing it with unbalanced pressure can cause the rod to jump abruptly.
Related AirTAC Lock & Standard Cylinders
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