Airtac BSAI Locking Clamp Cylinder BSAI40X225S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X225S is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 225mm 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
- Stroke225 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- 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 BSAI Locking Clamp Cylinder BSAI40X225S
The AirTAC BSAI40X225-S is a double-acting ISO 15552 profile cylinder equipped with a built-in clamp-lock mechanism. It features a carbon steel single rod and a PT tapered port thread. A spring-applied, air-released gripper clamps the piston rod to hold the load securely at any position along its 225mm travel. The integrated -S magnet enables position sensing with AirTAC CMSE reed and DMSE electronic solid-state switches.
This 40mm bore model delivers 628N of thrust at 0.5 MPa, but its defining feature is the 900N static holding force. Remember that holding force and thrust are separate quantities: you must size the clamp's 900N capacity against your static load, not the cylinder's push thrust. The lock engages only after the rod stops, as the variable air cushion merely decelerates the piston near stroke end without holding it. Unlocking requires a third G1/8 enclasp port and balanced air pressure to prevent the rod from jumping abruptly.
Airtac BSAI Locking Clamp Cylinder BSAI40X225S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X225S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 225 mm |
| Type | Single rod (BSAI), 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 | — |
Push/pull as tabulated. 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 BSAI Locking Clamp Cylinder BSAI40X225S Is Used
Mid-Stroke Vertical Hold
Locks a lowered load securely at any intermediate height along the 225mm travel without maintaining live air pressure.
Power Loss Safety
The spring-applied clamp engages automatically during an air pressure drop, freezing the rod exactly where it stopped.
Machining Position Lock
Holds a workpiece completely stationary against vibration during drilling or inspection processes at any required stroke position.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X225S the Right Clamp-Lock?
Choose this 900N holding model when an intermediate stop is needed before reaching the stroke end, a scenario where a SAIL stroke-end lock is insufficient. If full travel holding is unnecessary, a plain SAI cylinder suffices. Stepping down to a 32mm bore drops the holding force to 600N and thrust to 402N, while a 50mm bore increases holding to 1400N and thrust to 982N. Always ensure the clamp locks only after the cylinder stops, and add independent safety measures for human safety.
This BSAI40X225-S replacement requires a single rod, 40mm bore, 225mm stroke, and PT ports. It accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The M12x1.25 rod thread offers robust side-load capacity, though external guides are recommended for long strokes.
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 BSAI Locking Clamp Cylinder BSAI40X225S FAQ
The clamp-lock provides a static holding force of 900N. It is bidirectional and can secure the rod at any position along the 225mm stroke, but it only engages after the cylinder has stopped moving.
The clamp uses a third G1/8 enclasp port and requires balanced air pressure on both sides of the piston to unlock safely. If pressures are not balanced, the rod can move abruptly upon release, so always ensure the cylinder has stopped completely before unlocking.
Related AirTAC Lock & Standard Cylinders
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