Airtac BSAI Locking Clamp Cylinder BSAI125X150
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X150 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 BSAI125X150
The AirTAC BSAI125X150 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It secures the piston rod at any position along its 150 mm travel, delivering a robust static holding force of 8600 N. Operating within a 0.15-0.7 MPa pressure range, it generates 6136 N of thrust at 0.5 MPa, extending to 8590 N at 0.7 MPa. A critical design distinction is that this 8600 N holding force is a separate static metric from the cylinder's thrust; you must size the clamp capacity against the static load weight, not the pneumatic push force.
This mechanism locks bidirectionally but only after the rod has come to a complete stop, meaning it cannot brake a moving load. The integrated variable air cushion decelerates the piston near stroke ends, but the clamp itself is what physically holds the payload. Unlocking requires balanced air pressure on both sides of the piston via the dedicated G1/8 enclasp port; failing to balance the pressure before releasing the clamp can cause the rod to jump abruptly. For safety-critical applications, an independent external safety measure must supplement the lock.
Airtac BSAI Locking Clamp Cylinder BSAI125X150 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X150 |
|---|---|
| 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 BSAI125X150 Is Used
Vertical Load Holding
Suspends heavy vertical payloads at any point in the 150 mm travel, preventing gravity-driven drops during air pressure loss.
Machining Position Lock
Clamps a heavy workpiece or fixture rigidly in place during high-force machining operations to prevent deflection.
Power Failure Safety
Engages instantly upon air loss to freeze the 125 mm bore rod in its current position, protecting operators and tooling.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X150 the Right Clamp-Lock?
Choose this 125 mm bore model when a load up to 8600 N must be held mid-stroke, stepping up from the 80 mm bore (which provides 3600 N holding force and 2513 N thrust at 0.5 MPa). If the application only requires holding at the stroke ends, a plain SAI or SAIL cylinder is sufficient, but the BSAI is required for true lock-anywhere capability. Because the rod is 32 mm with an M27x2 thread, it carries substantial side-load resistance, though external guidance is still recommended for heavy loads. Replacement requires matching the single-rod configuration, 150 mm stroke, PT ported 1/2 inch cylinder threads, and the BSAI mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, TCM2). Note that without a -S magnet, CMSE or DMSE sensors cannot be used.
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 BSAI125X150 FAQ
The clamp-lock provides a static holding force of 8600 N and can secure the rod bidirectionally at any position along the 150 mm stroke. It only engages after the cylinder has stopped moving.
The variable air cushion only decelerates the piston near stroke ends; the spring-applied clamp provides the actual hold. To unlock safely, balanced air pressure must be applied to both sides of the piston via the G1/8 enclasp port to prevent the rod from jumping.
Related AirTAC Lock & Standard Cylinders
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