Airtac BSAI Locking Clamp Cylinder BSAI125X125S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X125S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 125mm 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
- Stroke125 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X125S
The AirTAC BSAI125X125-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. It delivers a practical thrust of 6136 N at 0.5 MPa and utilizes a robust M27x2 carbon steel rod. A defining feature is its ability to lock the piston at ANY position along the 125 mm stroke, providing a static holding force of 8600 N. This bidirectional hold secures the load regardless of whether the rod was extending or retracting.
It is crucial to distinguish this holding force from the cylinder thrust; the 8600 N clamp rating is the static load capacity, separate from the 6136 N pneumatic push force, meaning you must size the hold against the static load rather than the thrust. The lock engages only after the cylinder has stopped, as it cannot brake a moving rod. Unlocking requires balanced air pressures on both sides of the piston via the dedicated G1/8 enclasp port, preventing abrupt rod jumps. Additionally, the variable air cushion at the stroke ends only decelerates the piston and does not contribute to holding the load.
Airtac BSAI Locking Clamp Cylinder BSAI125X125S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X125S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 BSAI125X125S Is Used
Vertical Load Holding
Secures heavy vertical platens at any point in the 125 mm travel, relying on the 8600 N static clamp rather than live air pressure to prevent gravity-driven drops.
Power Loss Safety
The spring-applied clamp engages automatically upon air loss, freezing the rod exactly where it stopped to protect operators and tooling.
Machining Position Hold
Locks the workpiece rigidly at a custom mid-stroke location for machining or inspection, ensuring the part does not shift under cutting forces.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X125S the Right Clamp-Lock?
Select this 125 mm bore model when an application demands heavy mid-stroke holding, stepping up from a 100 mm bore that provides 3927 N thrust and 5500 N holding force. Choose this BSAI clamp-lock over a SAIL model when you need the load held at an arbitrary position rather than solely at the stroke end. If power loss safety is not required, a plain SAI cylinder suffices. The clamp locks only after the rod stops and requires balanced pressure to unlock safely; human-safety-critical loads need an additional independent safety measure.
This replacement match features a single rod, 125 mm bore, 125 mm stroke, and PT tapered ports. It accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The large 32 mm rod and M27x2 thread handle high side loads, and the included -S magnet works with AirTAC CMSE (reed) and DMSE (solid-state) sensors.
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 BSAI125X125S FAQ
The clamp-lock provides a static holding force of 8600 N. It locks the rod at any position bidirectionally, but it only engages after the cylinder has stopped moving; it cannot brake a moving load.
The clamp releases via a G1/8 enclasp port, but only when air pressures on both sides of the piston are balanced to prevent the rod from jumping. The -S magnet version works with AirTAC CMSE (reed) and DMSE (solid-state) sensors.
Related AirTAC Lock & Standard Cylinders
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