Airtac BSAI Locking Clamp Cylinder BSAI40X50
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X50 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 50mm 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
- Stroke50 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 BSAI40X50
The AirTAC BSAI40X50 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It secures the carbon steel piston rod at any position along its 50mm travel, delivering a static holding force of 900 N. The base pneumatic thrust is 628 N pushing and 528 N pulling at 0.5 MPa, but remember that holding force and thrust are separate quantities: you must size the 900 N clamp against your static load, not the cylinder's propulsion power.
Unlike a standard air cushion that merely decelerates the piston near stroke ends, this enclasp mechanism physically grips the rod to prevent drifting. It operates on a third G1/8 unlock port, separate from the 1/4 PT cylinder ports. Because the clamp engages only after the rod stops, it cannot brake a moving load, and releasing it requires balanced air pressure to prevent abrupt rod jumping.
Airtac BSAI Locking Clamp Cylinder BSAI40X50 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X50 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 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 BSAI40X50 Is Used
Vertical Load Holding
Prevents a lifted workpiece from dropping when air pressure is removed, securing the load at any point along the 50mm vertical travel.
Power Loss Safety
Engages automatically upon loss of system pressure to hold the rod exactly where it stopped, preventing abrupt crashes during an outage.
Machining Position Lock
Locks the 16mm rod rigidly in place during a brief drilling or inspection process, ensuring the workpiece does not shift under tooling force.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X50 the Right Clamp-Lock?
Select this 40mm bore model when an application requires mid-stroke holding rather than just end-of-stroke stopping, making it superior to a SAIL cylinder which only locks at the ends. If your load demands a higher clamp capacity, stepping up to the 50mm bore provides a 1400 N holding force and 982 N thrust at 0.5 MPa. For simple propulsion without position holding, a plain SAI cylinder suffices.
When replacing the BSAI40X50, match the single-rod configuration, 50mm stroke, PT port threads, and the M12x1.25 rod thread. The 16mm rod handles side loads well, but always ensure the rod has stopped before engaging the clamp and use balanced pressures to unlock safely. It accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Since no magnet is specified, position sensing requires adding a -S variant for CMSE reed or DMSE electronic sensors.
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 BSAI40X50 FAQ
The integrated clamp-lock provides a static holding force of 900 N. It grips the rod bidirectionally at any position, but this is strictly a holding force and cannot brake a moving rod.
You must apply air to the G1/8 unlock port only after balancing the pressures on both sides of the piston. If the cylinder pressures are not balanced, the rod can jump abruptly when the clamp releases.
Related AirTAC Lock & Standard Cylinders
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