Airtac BSAI Locking Clamp Cylinder BSAI40X500
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X500 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 500mm 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
- Stroke500 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 BSAI40X500
The AirTAC BSAI40X500 is a double-acting ISO 15552 profile cylinder featuring a built-in clamp-lock mechanism. A spring-applied, air-released gripper clamps the 16mm carbon steel piston rod, providing a static holding force of 900 N at any position along the 500mm stroke. This enclasp function is bidirectional, securing the load whether the rod was extending or retracting. The base cylinder generates 628 N push thrust at 0.5 MPa, scaling to a practical maximum of 879 N at 0.7 MPa. It is crucial to distinguish this holding force from the cylinder thrust: the 900 N clamp rating resists the static load, whereas the thrust drives the motion.
The lock engages only after the piston has stopped, meaning it cannot brake a moving rod. Unlocking requires a third G1/8 enclasp port and balanced air pressure on both sides of the piston to prevent the rod from jumping abruptly. The variable air cushion at the stroke ends only decelerates the piston; it does not hold the load. For position feedback, a -S magnet version pairs with AirTAC CMSE reed and DMSE solid-state sensors.
Airtac BSAI Locking Clamp Cylinder BSAI40X500 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X500 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 500 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 BSAI40X500 Is Used
Vertical Axis Holding
Prevents gravity-driven drops on vertical actuators by clamping the rod at any height during a power loss.
Machining Position Lock
Secures a workpiece at a specific mid-stroke coordinate for milling or drilling without relying on fluid pressure.
Emergency Stop Safety
Holds the load securely in place when the machine e-stops mid-cycle, provided the rod has ceased motion.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X500 the Right Clamp-Lock?
Choose this 40mm bore model when an application demands load holding mid-stroke, stepping up from a 32mm bore that offers 402 N thrust and 600 N holding force. Select BSAI over a SAIL cylinder when you need to lock at any position rather than only at the stroke end. If live pressure is always available and mid-stroke holding is unnecessary, a plain SAI cylinder suffices. For safety-critical vertical loads, note that the clamp locks after stopping and requires an additional independent safety measure.
To replace this unit, match the single-rod configuration, 40mm bore, 500mm stroke, and PT tapered port threads. The 16mm rod with an M12x1.25 thread handles side loads well, but at 500mm of travel an external guide is recommended to prevent binding. BSAI accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Operating pressure spans 0.15-0.7 MPa, with a speed range of 30-800 mm/s.
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 BSAI40X500 FAQ
The clamp-lock provides a static holding force of 900 N. It engages via a spring-applied, air-released mechanism that clamps the rod at any position along the stroke, operating independently of the 879 N maximum cylinder thrust.
The clamp unlocks via a third G1/8 enclasp port, but only when air pressures on both sides of the piston are balanced and the rod has stopped. 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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