Airtac BSAI Locking Clamp Cylinder BSAI125X150S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X150S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 150mm 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
- Stroke150 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 BSAI125X150S
The AirTAC BSAI125X150-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock. It secures the carbon steel piston rod at any position along its 150 mm travel, delivering a robust static holding force of 8600 N. Because it includes a -S magnet, it integrates seamlessly with AirTAC CMSE reed and DMSE electronic sensors for precise position detection. Operating at 0.15-0.7 MPa, it generates a 6136 N push thrust at 0.5 MPa.
It is crucial to distinguish this 8600 N holding force from the cylinder thrust; the clamp secures the static load, while thrust moves the mass. The enclasp mechanism uses a separate G1/8 unlock port and requires balanced air pressure on both sides of the piston to release safely. Furthermore, the variable air cushion only decelerates the piston near stroke ends, whereas the clamp is the true load-holding device.
Airtac BSAI Locking Clamp Cylinder BSAI125X150S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X150S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 BSAI125X150S Is Used
Vertical Load Holding
Maintains heavy elevated platforms at any point in the stroke with 8600 N of holding force, preventing gravity-driven drops during air pressure loss.
Machining Position Lock
Clamps a workpiece firmly in a non-end-of-stroke position for machining or inspection, ensuring the carbon steel rod does not drift under cutting forces.
Power Failure Safety
The spring-applied clamp engages instantly anywhere along the travel when air supply is lost, safely freezing the load until balanced pressure is restored.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X150S the Right Clamp-Lock?
Choose this 125 mm bore when an application demands exceptional mid-stroke security, stepping up from a 100 mm bore that offers 3927 N thrust and 5500 N holding force. A plain SAI cylinder suffices if the load only needs holding at the stroke end, but BSAI is required for true enclasp gripping anywhere in travel. Remember the clamp locks only after the rod stops, so human-safety applications need an independent mechanical measure.
For a drop-in replacement, match the single-rod configuration, 150 mm stroke, and PT tapered ports (1/2 inch cylinder port plus the G1/8 enclasp port). The M27x2 rod thread and 32 mm rod diameter provide high resistance to side loads. Mounting options include Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. The -S magnet works with CMSE and DMSE sensors for tracking.
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 BSAI125X150S FAQ
The clamp-lock provides a static holding force of 8600 N. It grips the rod bidirectionally at any position to hold the load, but it only engages after the cylinder has stopped moving.
The clamp uses a separate G1/8 enclasp port. You must balance the air pressure on both sides of the piston before unlocking, otherwise the rod can jump abruptly. The variable air cushion does not hold the load.
Related AirTAC Lock & Standard Cylinders
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