Airtac BSAI Locking Clamp Cylinder BSAI125X100S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X100S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 100mm 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
- Stroke100 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X100S
The AirTAC BSAI125X100-S is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released enclasp mechanism. A defining reason to choose this over a stroke-end-only SAIL model is that the clamp locks the carbon steel piston rod at ANY position along its 100 mm travel, providing a robust static holding force of 8600 N. Because it includes the -S magnet, it integrates seamlessly with AirTAC CMSE reed and DMSE electronic solid-state sensors mounted in the dual-side sensor grooves.
It is crucial to distinguish holding force from thrust: the 8600 N clamp rating is the static load capacity of the brake, entirely separate from the cylinder's 6136 N push thrust at 0.5 MPa. The clamp is bidirectional and engages only after the rod stops; it cannot brake a moving load. Additionally, the variable air cushion at both ends merely decelerates the piston near stroke end to prevent impact, while the enclasp clamp is the actual device that holds the load. Unlocking requires balanced air pressure on both piston sides via the dedicated G1/8 enclasp port, preventing abrupt rod jumps.
Airtac BSAI Locking Clamp Cylinder BSAI125X100S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X100S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 100 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 BSAI125X100S Is Used
Vertical Axis Load Holding
Secures heavy elevated platens at any point in the stroke, preventing gravity-induced drops during air loss without relying on end-stop cushions.
Power Loss Safety Brake
Spring-applied clamp immediately grips the rod when supply pressure drops, holding the workpiece safely mid-cycle rather than letting it free-fall.
Machining Position Lock
Freezes a heavy workpiece at a specific intermediate coordinate for drilling or inspection, ensuring zero unwanted shift during the operation.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X100S the Right Clamp-Lock?
Step down to the 100 mm bore if your application requires less thrust, as it provides 3927 N push force at 0.5 MPa and a 5500 N holding capacity. Choose this 125 mm bore when your static load demands the full 8600 N holding force alongside 6136 N of thrust. A plain SAI cylinder suffices if you only need standard pneumatic motion without mid-stroke holding. For safety-critical operations, remember the clamp locks only after the cylinder stops and requires an independent safety measure for human safety. Unlocking demands balanced pressures to avoid sudden rod movement.
As a single-rod BSAI model, this cylinder accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The substantial M27x2 rod thread and 32 mm rod diameter carry high side loads efficiently. The cylinder ports are PT 1/2, while the enclasp unlock port is G1/8. Ensure CMSE or DMSE sensors are specified for position feedback.
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 BSAI125X100S FAQ
The built-in enclasp clamp provides a static holding force of 8600 N. This is the capacity of the brake itself, which is distinct from the 6136 N push thrust of the cylinder at 0.5 MPa. The clamp locks the rod at any position bidirectionally, but only after the rod has come to a complete stop.
The clamp is spring-applied and air-released via a dedicated G1/8 enclasp port. To unlock it safely, the air pressures on both sides of the piston must be balanced and the cylinder must be stopped; otherwise, the rod can move abruptly upon release. For loads involving human safety, an additional independent safety measure is required.
Related AirTAC Lock & Standard Cylinders
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