Airtac BSAI Locking Clamp Cylinder BSAI125X175S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X175S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 175mm 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
- Stroke175 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X175S
The AirTAC BSAI125X175-S is a double-acting ISO 15552 profile cylinder featuring a carbon steel piston rod and a built-in spring-applied, air-released clamp-lock. It secures the load at any position along its 175 mm travel, delivering a robust static holding force of 8600 N. The -S variant includes a magnet for precise position sensing with CMSE reed and DMSE electronic switches. Operating at 0.15-0.7 MPa, it generates 6136 N of thrust at 0.5 MPa.
It is crucial to distinguish this 8600 N holding force from the cylinder's 6136 N thrust; the clamp independently secures the static load, while thrust drives the motion. The clamp locks only after the rod has stopped, meaning it cannot brake a moving load. Furthermore, the lock requires a separate G1/8 enclasp port and must be released with balanced air pressure on both sides of the piston to prevent the rod from jumping abruptly.
Airtac BSAI Locking Clamp Cylinder BSAI125X175S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X175S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 175 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 BSAI125X175S Is Used
Vertical Axis Holding
Secures heavy vertical loads at any point in the stroke, preventing sudden drops during power loss.
Machining Position Lock
Clamps the workpiece in a fixed non-end position for drilling or milling without relying on live air pressure.
Emergency Safety Stop
Holds the rod safely in place after the cylinder has stopped moving, ensuring a fail-safe hold during faults.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X175S the Right Clamp-Lock?
Choose this 125 mm bore when a load requires up to 8600 N of static holding force mid-stroke. If your application only needs holding at the stroke end, the AirTAC SAIL125 offers a simpler stroke-end lock, while a plain SAI125 suffices if no clamping is needed. If 6136 N thrust at 0.5 MPa is excessive, stepping down to an 80 mm bore provides 2513 N thrust and 3600 N holding force. For this BSAI model, the standard PT port is 1/2, the rod thread is M27x2, and the mounting set includes Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. Because the stroke is under 300 mm, side-load stress is manageable, though the substantial 32 mm rod naturally handles high lateral forces.
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 BSAI125X175S FAQ
It provides a static holding force of 8600 N and locks at any position along the stroke, unlike SAIL cylinders which only hold at stroke ends.
The spring-applied clamp locks only after the rod stops moving. It must be unlocked via the G1/8 enclasp port with balanced air pressure on both piston sides to prevent the rod from jumping.
Related AirTAC Lock & Standard Cylinders
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