Airtac BSAI Locking Clamp Cylinder BSAI125X600
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X600 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 600mm 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
- Stroke600 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
- 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 BSAI125X600
The AirTAC BSAI125X600 is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. Unlike a standard cylinder, this unit locks the piston rod at ANY position along its 600 mm stroke, delivering a robust static holding force of 8600 N. It operates within a 0.15-0.7 MPa range, generating 6136 N of push thrust at 0.5 MPa. A critical distinction for sizing: the 8600 N clamp holding force is a separate quantity from the cylinder thrust, so you must size the holding force against your static load, not the push thrust.
This model uses a carbon steel rod and PT threaded ports, requiring a 1/2 inch cylinder port alongside a separate G1/8 enclasp port to release the brake. The variable air cushion only decelerates the piston near the stroke ends; the mechanical clamp is the sole device responsible for holding the load. Because the clamp locks only after the rod has stopped, it cannot function as a braking device for a moving load.
Airtac BSAI Locking Clamp Cylinder BSAI125X600 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X600 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 600 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 BSAI125X600 Is Used
Mid-Stroke Machining Hold
Secures heavy workpieces at any point along the 600 mm travel for machining operations, using the 8600 N clamp to resist cutting forces without live air pressure.
Vertical Axis Safety Stop
Prevents heavy vertical loads from dropping when air pressure is lost, locking the rod instantly once the downward motion has stopped.
Power Loss Position Hold
Maintains the exact position of a 125 mm bore actuator during an emergency power outage, holding the load safely until balanced pressure is restored.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X600 the Right Clamp-Lock?
Choose this 125 mm bore when an application demands extreme holding capacity, stepping up from the 100 mm bore which offers 3927 N thrust and 5500 N holding force. If you only need to hold a load at the fully extended or retracted stroke end, a plain SAIL cylinder suffices; choose the BSAI125X600 specifically for mid-stroke position holding. Always remember the clamp engages after the cylinder stops, and it must be unlocked with balanced air pressures to prevent the rod from jumping abruptly. For safety-critical human loads, an independent external safety measure is required.
As a replacement match, ensure single-rod configuration, 125 mm bore, 600 mm stroke, PT ports, and the BSAI mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, TCM2). Because this is a 600 mm stroke, an external guide is recommended to handle side loads. The M27x2 rod thread is robust, but long unsupported strokes still require external guidance. This unit lacks a magnet; add an -S option 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 BSAI125X600 FAQ
The BSAI125X600 provides a static holding force of 8600 N. This bidirectional clamp locks the rod at any position along the stroke, but it only engages after the cylinder has stopped moving and cannot brake a moving rod.
The clamp is spring-applied and air-released via a separate G1/8 enclasp port. To prevent the rod from jumping abruptly, the air pressures on both sides of the piston must be balanced before unlocking. An independent safety measure is required for human safety applications.
Related AirTAC Lock & Standard Cylinders
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