Airtac BSAID Clamp Cylinder BSAID40X125
The AirTAC Airtac BSAID Clamp Cylinder BSAID40X125 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 125mm 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
- Stroke125 mm
- Cylinder portG1/4
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM12×1.25
About the Airtac BSAID Clamp Cylinder BSAID40X125
The AirTAC BSAID40X125 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 engages the carbon steel rod to hold the load at any position along the 125mm stroke, delivering a static holding force of 900 N. Because it is a double-rod design, thrust is equal in both directions at 528 N (based on 0.5 MPa), making it ideal for mounting a workpiece on one end and a counterweight or position flag on the opposite end.
It is crucial to distinguish this 900 N holding force from the 528 N thrust; the clamp sustains a static load independently of cylinder thrust. The clamp utilizes a third G1/8 enclasp port for air-release and requires balanced pressure to unlock safely. Furthermore, the variable air cushion at both ends only decelerates the piston near stroke end, while the clamp provides the actual load holding.
Airtac BSAID Clamp Cylinder BSAID40X125 Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID40X125 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Type | Double rod (BSAID), 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 | — |
Equal force both directions (double rod). 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 BSAID Clamp Cylinder BSAID40X125 Is Used
Vertical Lift Holding
Secures a vertically transferred workpiece at any mid-stroke height to prevent gravity drops during cycle pauses.
Machining Position Lock
Clamps a dual-sided fixture rigidly during milling or inspection, utilizing the second rod for a position flag.
Power Failure Safety
Engages automatically via spring force upon air loss to freeze the payload safely wherever it sits in travel.
Is the Airtac BSAID Clamp Cylinder BSAID40X125 the Right Clamp-Lock?
Select this double-rod model when dual-side guidance or anti-rotation is required, stepping up from a 32mm bore (345 N thrust, 600 N holding force) if your load demands greater stability. Choose BSAID over a stroke-end-only SAIL cylinder when intermediate position holding is necessary, or a plain SAID if no clamping is needed. The 16mm rod and M12x1.25 thread provide good side-load capacity, but always ensure external guidance for long strokes.
For replacements, match the 40mm bore, 125mm stroke, PT port threads, and double-rod layout. The BSAID mounting set omits FB, CA, CB, and CR brackets, accepting only Basic, FA, LB, TC, TCM1, and TCM2. Note that the clamp locks only after the rod stops completely and cannot brake a moving load; safety-critical applications require an independent mechanical measure.
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 BSAID40X125 FAQ
It uses a spring-applied, air-released gripper that clamps the rod at any position, providing a 900 N static holding force. It locks only after the cylinder has stopped moving and cannot be used as a dynamic brake.
The double-rod provides equal thrust in both directions and allows mounting a workpiece on one end while attaching a guide, counterweight, or position flag to the other, ensuring dual-side guidance and anti-rotation.
Related AirTAC Lock & Standard Cylinders
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