Airtac BSAID Clamp Cylinder BSAID125X75
The AirTAC Airtac BSAID Clamp Cylinder BSAID125X75 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 75mm 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
- Stroke75 mm
- Cylinder portG1/2
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAID Clamp Cylinder BSAID125X75
The AirTAC BSAID125X75 is a double-acting ISO 15552 profile cylinder featuring a rod extending from both ends and a spring-applied, air-released clamp-lock. It secures the load at any position along its 75mm stroke, delivering a static holding force of 8600 N. Because it is a double-rod design, the thrust is equal in both directions, generating 5734 N of pull force at 0.5 MPa. It is vital to distinguish this holding force from thrust: the 8600 N clamp rating defines the static load capacity against gravity, whereas the cylinder thrust dictates movement.
This enclasp mechanism requires a third G1/8 pneumatic port to release the spring-loaded gripper. The lock engages only after the piston has stopped, meaning it cannot brake a moving rod. Furthermore, the clamp must be released under balanced air pressures to prevent the rod from jumping abruptly. Unlike the variable air cushion that merely decelerates the piston near stroke ends, the clamp is the true load-holding device.
Airtac BSAID Clamp Cylinder BSAID125X75 Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID125X75 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 BSAID125X75 Is Used
Vertical Load Holding
Secures heavy vertical lifting platforms at any intermediate height with 8600 N of holding force, preventing sudden drops if air pressure is lost.
Machining Position Lock
Clamps a dual-sided workpiece fixture rigidly in place during drilling or milling, using the second rod for an external position flag.
Power-Out Safety Hold
Maintains the exact position of a heavy gantry guide anywhere in its travel during an unexpected power or air supply failure.
Is the Airtac BSAID Clamp Cylinder BSAID125X75 the Right Clamp-Lock?
Choose this 125mm bore double-rod model when an application requires symmetrical force (5734 N both ways) and heavy mid-stroke holding. If your load requires less holding capacity, stepping down to the 80mm bore provides 3600 N of holding force and 2268 N of pull thrust. This BSAID series excels over a stroke-end-only SAIL lock by gripping anywhere, but a plain SAID suffices if you only need end-of-travel stops. The dual-rod design allows mounting a workpiece on one end and a guide, counterweight, or position flag on the opposite end for dual-side anti-rotation guidance.
For safe operation, remember the clamp locks only after the cylinder stops and must be unlocked with balanced pressures. Safety-critical applications require an independent external measure. This configuration uses PT tapered ports (two 1/2 inch cylinder ports plus the G1/8 enclasp port), a robust 32mm carbon steel rod with an M27x2 thread for high side-load resistance, and accepts Basic, FA, LB, TC, TCM1, or TCM2 mounts (omitting FB, CA, CB, CR). Sensors are not included as no magnet is specified.
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 BSAID125X75 FAQ
The clamp-lock provides a static holding force of 8600 N. It is bidirectional and can grip the rod at any position along the 75mm stroke, not just at the end points.
The spring-applied clamp locks only after the cylinder has stopped moving; it cannot brake a moving rod. To prevent the rod from jumping, it must be unlocked by applying balanced air pressure to both sides of the piston via the G1/8 enclasp port.
Related AirTAC Lock & Standard Cylinders
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