Airtac BSAI Locking Clamp Cylinder BSAI125X80S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X80S 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 BSAI125X80S
The AirTAC BSAI125X80-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. It delivers a robust 8590 N of thrust at 0.7 MPa and utilizes a generous 32 mm carbon steel rod with an M27x2 thread to handle substantial side loads. Crucially, its integrated enclasp gripper provides a static holding force of 8600 N. Buyers must distinguish this holding force from the cylinder's thrust: thrust moves the load, but the clamp's 8600 N rating is what statically secures the payload against gravity.
This clamp locks the piston rod at any position along its 80 mm stroke and holds bidirectionally. The mechanism operates via a third G1/8 enclasp port, requiring 0.15-0.7 MPa of air pressure to release the spring-driven grip. The variable air cushions at both ends only decelerate the piston near stroke limits; they do not hold the load. The integrated -S magnet functions seamlessly with AirTAC CMSE reed and DMSE solid-state sensors for precise position feedback.
Airtac BSAI Locking Clamp Cylinder BSAI125X80S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X80S |
|---|---|
| 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 BSAI125X80S Is Used
Vertical Load Holding
Secures heavy elevated platens at any point in the stroke, preventing gravity-driven falls during a sudden air pressure loss.
Machining Position Lock
Freezes a heavy workpiece at a precise intermediate stroke location to withstand cutting forces during a machining cycle.
Power Failure Safety
Engages instantly upon air loss to hold the rod exactly where it stopped, protecting operators and tooling from uncontrolled drops.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X80S the Right Clamp-Lock?
Select this 125 mm bore model when a heavy vertical load demands high static security mid-stroke, as the 8600 N clamp outmatches smaller bores like the 100 mm variant, which offers 5500 N of holding force and 5497 N of thrust. If your application only requires end-of-stroke holding, the AirTAC SAIL series suffices and simplifies plumbing. For standard drive motion without any locking needs, a plain SAI cylinder is the better choice.
When replacing a unit, match the single-rod configuration, 125 mm bore, 80 mm stroke, and PT tapered port threads. The BSAI accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Remember that the clamp locks only after the rod has completely stopped; it cannot brake a moving load. Furthermore, you must balance air pressures on both sides of the piston before unlocking, or the rod may jump abruptly. For human-safety-critical applications, always add an independent mechanical 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 BSAI125X80S FAQ
The integrated clamp-lock provides a static holding force of 8600 N. It engages via spring pressure to hold the rod securely at any position along the stroke, completely independent of the cylinder's 8590 N thrust rating.
The clamp is released by applying 0.15-0.7 MPa of air to the G1/8 enclasp port. For safety, you must balance the air pressures on both sides of the piston before unlocking; otherwise, the rod can jump abruptly. The lock only engages after the rod has stopped moving.
Related AirTAC Lock & Standard Cylinders
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