Airtac BSAI Locking Clamp Cylinder BSAI40X450
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X450 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 450mm 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
- Stroke450 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 BSAI40X450
The AirTAC BSAI40X450 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It delivers 628N of thrust at 0.5 MPa and firmly grips the 16mm carbon steel rod at any position along its 450mm travel, providing a static holding force of 900N. Remember that this holding force is entirely separate from the cylinder thrust; you must size the clamp capacity against your static load, not the push force. The mechanism is bidirectional, securing the rod whether it was extending or retracting.
This model uses a third G1/8 PT enclasp port to release the brake, requiring a balanced 0.15-0.7 MPa air pressure on both sides of the piston to unlock safely. Note that the variable air cushion only decelerates the piston near the stroke ends; the clamp is what actually holds the load. The lock engages only after the cylinder has stopped, meaning it cannot brake a moving rod.
Airtac BSAI Locking Clamp Cylinder BSAI40X450 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X450 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 450 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 BSAI40X450 Is Used
Vertical Axis Hold
Prevents gravity-driven drops on vertical lifts by clamping the rod at any height, maintaining a secure 900N hold without continuous air pressure.
Power Loss Safety
Spring-applied brake instantly secures the load anywhere in the 450mm travel during an unexpected air or power failure, keeping the assembly stationary.
Machining Position Hold
Locks the workpiece at a precise intermediate spot for drilling or inspection, ensuring the carbon steel rod remains rigidly fixed during the process.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X450 the Right Clamp-Lock?
Choose this 40mm bore model when an application requires holding a load at an arbitrary position mid-stroke, a task where a plain SAI cylinder or a SAIL stroke-end-only lock would fail. If your load exceeds the 900N holding capacity, step up to the 50mm bore, which provides 982N thrust at 0.5 MPa and a 1400N clamp force. If mid-stroke locking is unnecessary, a standard SAI suffices. Because this is a 450mm stroke, the extended rod needs external guidance to prevent excessive side-loading, despite the M12x1.25 thread providing a robust mounting interface.
This single-rod version accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. It uses PT tapered ports, has no magnet for sensors, and requires a balanced-pressure unlock sequence to prevent the rod from jumping abruptly upon release. For human-safety critical holds, always add an independent mechanical 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 BSAI Locking Clamp Cylinder BSAI40X450 FAQ
It provides a static holding force of 900N. The clamp locks the rod at any position along the stroke, but it only engages after the cylinder has stopped moving; it cannot brake a moving load.
The clamp is released by applying air to the G1/8 enclasp port, but only after the air pressures on both sides of the piston are balanced. If pressures are unbalanced during unlock, the rod can jump abruptly, so always ensure the cylinder has stopped and pressures are equalized.
Related AirTAC Lock & Standard Cylinders
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