Airtac BSAI Locking Clamp Cylinder BSAI125X700
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X700 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 700mm 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
- Stroke700 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X700
The AirTAC BSAI125X700 is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. It delivers a practical maximum thrust of 8590 N at 0.7 MPa, while the integrated enclasp gripper provides a static holding force of 8600 N. A critical distinction exists between these two figures: the cylinder thrust moves the load, but the clamp holding force is what secures the static payload. You must size the holding force against the load weight, not the push thrust.
This bidirectional lock grips the 32 mm carbon steel rod at any position along the 700 mm travel, functioning via a dedicated G1/8 enclasp port that is separate from the 1/2 inch cylinder ports. Remember that the variable air cushion only decelerates the piston near the stroke ends; the clamp is the sole device responsible for maintaining the load position. The unit operates within a 0.15-0.7 MPa pressure range and supports speeds of 30-500 mm/s.
Airtac BSAI Locking Clamp Cylinder BSAI125X700 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X700 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 700 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 BSAI125X700 Is Used
Heavy Vertical Lifts
Secures a massive vertical payload at any intermediate height along the 700 mm stroke, preventing sudden drops when air pressure is removed.
Emergency Power Loss Hold
The spring-applied clamp engages automatically upon loss of air pressure, freezing a heavy workpiece safely in mid-travel to protect operators.
Machining Position Hold
Locks a heavy casting firmly in a specific intermediate position for machining or inspection, using the 8600 N static holding force to resist cutting forces.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X700 the Right Clamp-Lock?
Choose this 125 mm bore when a heavy load requires substantial holding capacity, stepping up from the 80 mm bore which offers 3600 N of holding force and 2513 N push thrust at 0.5 MPa. Select this BSAI model over a SAIL cylinder when the payload must be frozen at an intermediate point in the 700 mm stroke rather than just at the end. If no intermediate locking is necessary, a plain SAI cylinder provides sufficient motion control. Because this stroke exceeds 300 mm, the long unsupported rod requires external guidance to prevent excessive side loading.
For safe operation, understand that the clamp locks only after the piston has stopped; it cannot brake a moving rod. Furthermore, the lock must be released by balancing the air pressures on both sides of the piston, or the rod may jump abruptly. Safety-critical applications require an independent external safety measure. Replacement requires a single-rod, 125 mm bore, 700 mm stroke cylinder with PT ports, and the BSAI mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, TCM2). This configuration uses a standard carbon steel rod without a magnet, meaning CMSE or DMSE sensors cannot be installed.
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 BSAI125X700 FAQ
The 8600 N is the static holding force applied by the spring-loaded clamp directly to the rod. It holds the load securely at any position along the 700 mm stroke, but it is completely separate from the 8590 N pneumatic thrust used to move the load.
No, the clamp only locks after the cylinder has stopped moving; it cannot brake a moving rod. Additionally, unlocking requires balanced air pressure on both sides of the piston to prevent the rod from jumping. An independent safety measure is required for human safety.
Related AirTAC Lock & Standard Cylinders
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