Airtac BSAI Locking Clamp Cylinder BSAI125X400
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X400 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 400mm 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 8600 N.
- BoreØ125 mm
- Stroke400 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X400
The AirTAC BSAI125X400 is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock. It clamps the 32 mm carbon steel rod to hold a static load at any position along its 400 mm stroke, providing a formidable holding force of 8600 N. Because it is a profile cylinder with an extruded aluminum barrel, it integrates cleanly into modern machinery while remaining dimensionally interchangeable per ISO 15552 mounting interfaces.
It is crucial to distinguish this 8600 N holding force from the cylinder's standard thrust, which is 6136 N at 0.5 MPa (or 8590 N at the 0.7 MPa maximum for this series). The lock is not a substitute for the air cushion, which only decelerates the piston near stroke ends. Furthermore, the clamp locks only after the rod has stopped; it cannot brake a moving load, and unlocking requires balanced air pressures via the G1/8 enclasp port to prevent abrupt rod jumps.
Airtac BSAI Locking Clamp Cylinder BSAI125X400 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X400 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/2 |
| Rod thread | M27×2 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 8600 N |
| Enclasp / unlock port | G1/8 |
| Operating pressure | 0.15 – 0.7 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Max stroke | Up to 1000 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 (Ø125 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa (max) | 8590 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (8600 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI125X400 Is Used
Heavy Vertical Axis Hold
Secures massive vertical loads at any point in the 400 mm travel, preventing gravity-driven drops when air pressure is removed.
Machining Position Lock
Clamps the workpiece firmly in place during heavy machining or inspection operations, ensuring zero unwanted rod movement.
Power Loss Safety
The spring-applied enclasp engages automatically upon power or air loss, freezing the 125 mm bore rod exactly where it stopped.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X400 the Right Clamp-Lock?
Step down to a bore 80 model if your load requires less than 3600 N of holding force, as the 80 mm bore delivers 2513 N thrust at 0.5 MPa. Choose this BSAI125X400 when a heavy vertical axis must be arrested anywhere in its travel, a scenario where a SAIL cylinder fails because it only locks at stroke ends. If position holding is entirely unnecessary, a plain SAI cylinder suffices.
This single-rod configuration uses a PT tapered 1/2 inch cylinder port and a separate G1/8 enclasp port. It accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Because this 400 mm stroke exceeds 300 mm, an external guide is recommended to support the rod against side loads. The clamp locks only after the cylinder stops, so safety-critical applications need an independent secondary measure. No magnet is specified, so CMSE or DMSE sensors cannot be used without modification.
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 BSAI125X400 FAQ
The static holding force is 8600 N. The clamp is bidirectional and spring-applied, meaning it will hold the load securely at any position along the stroke without requiring continuous air pressure.
No. The clamp locks only after the cylinder has come to a complete stop; it cannot brake a moving rod. Additionally, unlocking requires balanced air pressures on both sides of the piston to prevent the rod from jumping abruptly.
Related AirTAC Lock & Standard Cylinders
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