Airtac BSAI Locking Clamp Cylinder BSAI125X80
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X80 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 80mm 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
- Stroke80 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X80
The AirTAC BSAI125X80 is a double-acting ISO 15552 profile cylinder with a spring-applied, air-released clamp-lock mechanism. It provides a static holding force of 8600 N at any position along its 80 mm stroke. Delivering 6136 N of thrust at 0.5 MPa, it handles heavy loads. Remember that holding force and thrust are distinct quantities; you must size the 8600 N clamp capacity against your static load, not the cylinder push force.
This enclasp unit uses a third G1/8 port to release the bidirectional lock. Note that the clamp only engages after the rod stops, meaning it cannot brake a moving load. Furthermore, the lock must be released with balanced air pressures to prevent abrupt rod movement. The variable air cushion only decelerates the piston near stroke end and does not contribute to holding the load.
Airtac BSAI Locking Clamp Cylinder BSAI125X80 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X80 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 80 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 BSAI125X80 Is Used
Vertical Load Holding
Holds heavy vertical loads securely at any point in the 80 mm travel, preventing drops during power loss.
Machining Position Lock
Clamps the rod rigidly with 8600 N to prevent deflection during heavy machining or pressing tasks.
Emergency Stop Safety
Maintains position safely when the machine halts, though human-safety applications need independent measures.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X80 the Right Clamp-Lock?
Choose this 125 mm bore if your static load requires up to 8600 N of holding capacity. If your application only needs end-of-stroke holding, a plain SAI or SAIL cylinder is sufficient, but BSAI is required for mid-stroke positioning. If your load is lighter, stepping down to a 100 mm bore provides 5500 N of holding force and 3927 N of thrust at 0.5 MPa.
For safe operation, ensure the rod has stopped before clamping and balance pressures before unlocking. This single-rod PT-port cylinder accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The M27x2 rod thread handles high side loads, and sensors require an -S magnet for CMSE reed or DMSE electronic switches.
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 BSAI125X80 FAQ
The integrated clamp-lock provides a static holding force of 8600 N at any position along the stroke. This holding capacity is separate from the cylinder's 6136 N thrust and should be matched directly against your static load.
No, the clamp locks only after the cylinder has stopped; it is not a dynamic brake. Additionally, you must balance the air pressures on both sides of the piston before unlocking, or the rod may jump abruptly.
Related AirTAC Lock & Standard Cylinders
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