Airtac BSAI Locking Clamp Cylinder BSAI125X175
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X175 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 BSAI125X175
The AirTAC BSAI125X175 is a double-acting ISO 15552 profile cylinder featuring a built-in clamp-lock mechanism. A spring-applied, air-released gripper clamps the 32 mm carbon steel piston rod, securing the load at any position along its 175 mm stroke with a static holding force of 8600 N. This bidirectional lock holds whether the rod was extending or retracting, operating within a 0.15-0.7 MPa pressure range. The base extruded aluminum barrel is dimensionally interchangeable per ISO 15552 mounting interfaces.
It is crucial to distinguish between holding force and thrust: the 8600 N clamp force is a static load-holding metric, entirely separate from the cylinder's 6136 N push thrust at 0.5 MPa. The clamp engages only after the rod has stopped, meaning it cannot brake a moving load. Additionally, the variable air cushion at stroke ends only decelerates the piston; the mechanical clamp is what actually holds the position. Unlocking requires balanced air pressure on both sides of the piston via the dedicated G1/8 enclasp port, preventing abrupt rod movement upon release.
Airtac BSAI Locking Clamp Cylinder BSAI125X175 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X175 |
|---|---|
| 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 BSAI125X175 Is Used
Vertical Load Holding
Secures heavy vertical loads at any point in the stroke, preventing drops during power loss with 8600 N of static holding force.
Machining Position Hold
Clamps the rod rigidly mid-stroke so workpieces remain fixed and vibration-resistant during machining or inspection processes.
Emergency Safety Stop
Provides a fail-safe hold if air pressure drops, engaging only after motion stops to secure the payload without acting as a brake.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X175 the Right Clamp-Lock?
Choose this 125 mm bore when an application demands substantial holding power, stepping up from the 80 mm bore which provides 2513 N thrust and 3600 N holding force. A BSAI clamp-lock is preferred over a SAIL stroke-end lock when you need the load secured mid-travel rather than only at the extremes. If the process simply requires standard movement without intermediate holding, a plain SAI cylinder suffices.
For replacements, match the single-rod configuration, 125 mm bore, 175 mm stroke, and PT tapered port threads. The 32 mm rod and M27x2 thread provide excellent rigidity against side loads. Mounting options for this single-rod profile include Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. Note that the clamp locks only after the cylinder stops and requires balanced pressure to unlock safely; safety-critical applications must include an independent external safety measure.
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 BSAI125X175 FAQ
The static holding force is 8600 N. The clamp locks the rod at any position along the stroke, but it engages only after the cylinder has completely stopped moving; it cannot brake a moving rod.
The clamp is spring-applied and air-released via a dedicated G1/8 port. To prevent the rod from jumping abruptly, the air pressures on both sides of the piston must be balanced before unlocking, or the cylinder must be fully stopped.
Related AirTAC Lock & Standard Cylinders
Request a Quote for Airtac BSAI Locking Clamp Cylinder BSAI125X175
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.