Airtac BSAI Locking Clamp Cylinder BSAI40X450S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X450S 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 BSAI40X450S
The AirTAC BSAI40X450-S is a double-acting ISO 15552 profile cylinder with a built-in clamp-lock, featuring a carbon steel single rod and a 450mm stroke. A spring-applied, air-released mechanism clamps the rod to hold a static load securely at any position along the travel with a holding force of 900 N. This holding force is a distinct quantity from the cylinder thrust, which is 628 N push and 528 N pull at 0.5 MPa; buyers must size the clamp holding force against the load, not the thrust. The enclasp requires a third G1/8 pneumatic port to release.
The clamp locks bidirectionally after the piston has stopped, meaning it cannot brake a moving rod. It must be unlocked with balanced air pressures on both sides of the piston, or the rod may jump abruptly. Note that the variable air cushion only decelerates the piston near the stroke end; the clamp is the actual holding device. The -S magnet works with AirTAC CMSE reed and DMSE electronic sensors.
Airtac BSAI Locking Clamp Cylinder BSAI40X450S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X450S |
|---|---|
| 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 BSAI40X450S Is Used
Vertical Axis Hold
Locks a 40mm bore lift at any intermediate height with 900 N force to prevent gravity drops during workpiece transfer.
Power Loss Safety
Spring-applied clamp engages automatically on air loss to freeze the 450mm stroke in place, protecting the process.
Machining Position Lock
Holds the rod rigidly at a custom machining coordinate while operations occur, releasing only when balanced pressure is applied.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X450S the Right Clamp-Lock?
Choose this 40mm bore if you need 628 N thrust at 0.5 MPa and 900 N static holding anywhere in the stroke. If your load requires less force, a 32mm bore offers 402 N thrust and 600 N holding force; if you need more rigidity, a 50mm bore provides 982 N thrust and 1400 N holding force. Select BSAI over a SAIL cylinder when you must lock at any mid-stroke position rather than only at the stroke end. A plain SAI cylinder suffices if no clamp is needed.
This model includes PT tapered ports and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The M12x1.25 rod thread handles side loads well, but at 450mm stroke you should use an external guide to prevent binding. Remember the clamp locks only after stopping and requires balanced pressure to unlock safely; human safety applications need an independent external 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 BSAI40X450S FAQ
The spring-applied clamp provides a static holding force of 900 N. It engages bidirectionally at any position along the 450mm stroke, but only after the piston has stopped moving.
The clamp unlocks via a separate G1/8 enclasp port, but only when the air pressures on both sides of the piston are balanced. If pressures are unbalanced, the rod can jump abruptly upon release. It is not a moving-rod brake.
Related AirTAC Lock & Standard Cylinders
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