Airtac BSAID Clamp Cylinder BSAID40X125S
The AirTAC Airtac BSAID Clamp Cylinder BSAID40X125S 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 BSAID40X125S
The AirTAC BSAID40X125-S is a double-acting ISO 15552 profile cylinder featuring a double-rod layout and an integrated clamp-lock mechanism. A spring-applied, air-released gripper secures the piston rod at any position along its 125mm travel, delivering a static holding force of 900 N. Because it is a double-rod design, the thrust is equal in both directions at 528 N (0.5 MPa), and the second rod allows you to mount a position flag or secondary tool on the opposite end.
It is vital to distinguish this 900 N holding force from the 528 N cylinder thrust; the clamp sustains static loads independently of pneumatic pressure, while thrust drives the motion. The lock engages via a third G1/8 enclasp port and only activates after the rod has completely stopped—it cannot brake a moving load. Furthermore, the variable air cushions at the stroke ends only decelerate the piston; they do not hold the load. The integrated magnet works with CMSE reed and DMSE electronic sensors for precise position feedback.
Airtac BSAID Clamp Cylinder BSAID40X125S Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID40X125S |
|---|---|
| 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 BSAID40X125S Is Used
Vertical Axis Holding
Locks a lifted workpiece securely at any intermediate height along the vertical stroke to prevent gravity-induced drops during processing.
Power Loss Safety
The spring-applied clamp engages automatically upon air pressure loss, freezing the double-rod payload exactly where it stopped.
Machining Position Hold
Uses the second rod for a counterweight while the primary end holds a part rigidly against machining vibration with 900 N of force.
Is the Airtac BSAID Clamp Cylinder BSAID40X125S the Right Clamp-Lock?
Choose this double-rod configuration when your application requires equal push/pull forces (528 N both ways at 0.5 MPa) and dual-side mounting for anti-rotation or external guidance. If you only need end-of-stroke holding, a plain SAIL cylinder suffices, but the BSAID series is necessary when intermediate locking is required. If your static load exceeds 900 N, step up to the 50 mm bore, which provides 825 N of thrust and a 1400 N holding force. For lighter loads, the 32 mm bore offers 345 N thrust and 600 N holding force.
When replacing this unit, match the 40 mm bore, 125 mm stroke, PT tapered port threads, and double-rod architecture. The mounting interface is dimensionally interchangeable per ISO 15552, but BSAID supports a specific set of mounts: Basic, FA, LB, TC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). The clamp locks only after the cylinder stops and must be unlocked with balanced air pressures (0.15-0.7 MPa) to prevent the rod from jumping abruptly. For safety-critical applications, always add an independent external safety 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 BSAID40X125S FAQ
The clamp-lock provides a static holding force of 900 N. It uses a spring-applied, air-released mechanism that grips the rod at any position along the stroke, holding the load bidirectionally without requiring live air pressure.
The clamp unlocks only when air pressures on both sides of the piston are balanced via the G1/8 enclasp port, preventing the rod from jumping. It is a static hold only; it cannot brake a moving rod and locks only after the cylinder has stopped.
Related AirTAC Lock & Standard Cylinders
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