Airtac BSAID Clamp Cylinder BSAID40X250S
The AirTAC Airtac BSAID Clamp Cylinder BSAID40X250S is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 250mm 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
- Stroke250 mm
- Cylinder portG1/4
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM12×1.25
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac BSAID Clamp Cylinder BSAID40X250S
The AirTAC BSAID40X250-S is a double-acting ISO 15552 profile cylinder featuring a built-in clamp-lock mechanism and a double-rod design. A spring-applied, air-released gripper clamps the piston rod to secure the load at any position along the 250 mm stroke, delivering a static holding force of 900 N. Because it is a double-rod cylinder, the thrust is equal in both directions at 528 N (0.5 MPa). A second rod extending out the rear allows you to mount a position flag, counterweight, or secondary tool, providing dual-side guidance and anti-rotation.
It is vital to distinguish this 900 N static holding force from the 528 N cylinder thrust; you must size the clamp against the static load, not the actuation thrust. The clamp uses a third G1/8 enclasp port (separate from the 1/4 cylinder ports) and requires a balanced air pressure of 0.15-0.7 MPa to unlock safely. Note that the variable air cushion only decelerates the piston near stroke ends; the mechanical clamp is the sole device holding the load. The integrated -S magnet works with AirTAC CMSE (reed) and DMSE (solid-state) sensors.
Airtac BSAID Clamp Cylinder BSAID40X250S Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID40X250S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 BSAID40X250S Is Used
Vertical Lift Holding
Secures a lifted workpiece at any intermediate height along the vertical axis, preventing drops during air pressure loss without relying on end-of-stroke stops.
Machining Position Lock
Clamps the dual-rod assembly rigidly during drilling or milling operations, absorbing process forces while the second rod supports a parallel fixture.
Emergency Safety Stop
Engages instantly upon power loss to freeze the payload exactly where it stopped, though an independent safety measure is required for human-safe loads.
Is the Airtac BSAID Clamp Cylinder BSAID40X250S the Right Clamp-Lock?
Choose this 40 mm bore if your application requires 528 N of equal bidirectional thrust and 900 N of intermediate holding power. If you only need to hold at the stroke end, a plain SAIL lock cylinder suffices, but BSAID is required for multi-position clamping. For heavier vertical loads, stepping up to the 50 mm bore increases holding force to 1400 N and thrust to 825 N. Remember the clamp locks only after the rod stops; it cannot brake a moving load, and releasing it requires balanced piston pressures to prevent the rod from jumping abruptly.
This double-rod configuration omits the FB, CA, CB, and CR mounting styles, accepting only Basic, FA, LB, TC, TCM1, and TCM2 brackets. The 16 mm carbon steel rod with an M12x1.25 thread handles side loads well, but with a 250 mm stroke, external guidance is recommended for rigid applications. Replacement requires a double-rod, 40 mm bore, 250 mm stroke, PT port thread, and an -S magnet.
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 BSAID40X250S FAQ
It uses a spring-applied, air-released gripper that clamps the rod to hold the load at any position with a 900 N static holding force. It is bidirectional and engages after the cylinder stops, meaning it cannot brake a moving rod.
The double-rod design provides equal 528 N thrust in both directions and allows you to mount a workpiece on one end and a guide or position flag on the other. It also restricts mounting to Basic, FA, LB, TC, TCM1, and TCM2 brackets.
Related AirTAC Lock & Standard Cylinders
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