Airtac BSAID Clamp Cylinder BSAID40X250
The AirTAC Airtac BSAID Clamp Cylinder BSAID40X250 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 BSAID40X250
The AirTAC BSAID40X250 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. A rod extends from both ends, delivering an equal thrust of 528N in both directions at 0.5 MPa. The integrated enclasp mechanism clamps the piston rod to secure the load at any position along the 250mm travel, providing a static holding force of 900N. It is vital to distinguish this holding force from the cylinder's thrust; you must size the clamp's 900N capacity against your static load, not the 528N thrust.
The double-rod architecture is chosen to mount a workpiece on one end and a guide, counterweight, or position flag on the other, ensuring dual-side guidance and anti-rotation. Unlocking requires a third G1/8 enclasp port and balanced air pressure on both sides of the piston. The variable air cushion only decelerates the piston near stroke ends; the clamp is the true holding device. This unit operates on filtered air at 0.15-0.7 MPa and runs at 30-800 mm/s.
Airtac BSAID Clamp Cylinder BSAID40X250 Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID40X250 |
|---|---|
| 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 BSAID40X250 Is Used
Vertical Lift Hold
Holds a suspended load securely at any mid-stroke position on vertical axes, preventing gravity drops during air loss.
Power Loss Safety
Spring-applied clamp engages instantly anywhere in travel to freeze the dual rods if air pressure drops.
Machining Positioning
Locks the workpiece rigidly in place for intermediate machining or inspection without cycling to an end cap.
Is the Airtac BSAID Clamp Cylinder BSAID40X250 the Right Clamp-Lock?
Choose this double-rod clamp-lock model when you need equal force both ways and anti-rotation guidance. If your load requires a higher hold, step up to the 50mm bore, which offers a 1400N holding force and 825N pull thrust. If you only need to hold at the stroke end, a plain SAIL40 saves complexity, while a standard SAID40 suffices if no mid-stroke clamping is needed. For replacement, match the 40mm bore, 250mm stroke, PT port threads, and the BSAID mounting set (Basic, FA, LB, TC, TCM1, TCM2), noting that double-rod types omit the FB, CA, CB, and CR brackets.
Always apply the clamp only after the cylinder has stopped; it cannot brake a moving rod. Furthermore, it must be unlocked with balanced pressures to prevent the rod from jumping abruptly. For safety-critical loads, an additional independent safety measure is required. At 250mm stroke, the 16mm carbon steel rod handles side loads well, but longer unsupported travels need an external guide.
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 BSAID40X250 FAQ
The integrated enclasp clamp provides a static holding force of 900N. It locks the rod at any position bidirectionally, but this is separate from the 528N thrust and only engages after the cylinder has stopped.
The clamp unlocks via a third G1/8 enclasp port. You must balance the air pressure on both sides of the piston before releasing the clamp; otherwise, the rod can jump abruptly. It is not a moving-rod brake.
Related AirTAC Lock & Standard Cylinders
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