Airtac BSAI Locking Clamp Cylinder BSAI125X200S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X200S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 200mm 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
- Stroke200 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac BSAI Locking Clamp Cylinder BSAI125X200S
The AirTAC BSAI125X200-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. A defining feature of this series is its ability to lock the piston rod at ANY position along the 200 mm stroke, 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 for precise end-position detection.
It is crucial to distinguish this 8600 N clamping force from the cylinder's dynamic thrust; the lock sustains a static load, whereas the pneumatic thrust (up to 8590 N at 0.7 MPa) drives the motion. The clamp engages via a dedicated G1/8 enclasp port—a third line separate from the two 1/2 cylinder ports. Remember that the variable air cushion only decelerates the piston near the stroke ends; the mechanical clamp is the sole device responsible for securing the load.
Airtac BSAI Locking Clamp Cylinder BSAI125X200S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X200S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 200 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 BSAI125X200S Is Used
Mid-Stroke Machining Hold
Freezes a heavy workpiece at an exact intermediate position for machining or inspection, utilizing the 8600 N clamp to resist cutting forces without live air pressure.
Vertical Axis Safety
Secures a vertical load at any height along the stroke, engaging only after the cylinder stops to prevent uncommanded drops during power loss.
Heavy Load Positioning
Holds substantial payloads securely in place during assembly pauses, relying on the mechanical lock rather than continuous pneumatic thrust.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X200S the Right Clamp-Lock?
Select this 125 mm bore model when a workpiece demands extreme holding capacity that a smaller bore cannot safely sustain; stepping down to a 100 mm bore drops the holding force to 5500 N and the 0.5 MPa thrust to 3927 N. Choose this BSAI clamp-lock over a SAIL variant when you must freeze the rod mid-stroke rather than solely at the end positions. If no intermediate holding is required, a plain SAI cylinder provides the same ISO 15552 dimensions without the clamp complexity.
When integrating this unit, note the clamp locks only AFTER the rod has stopped; it cannot brake a moving load. Always unlock the clamp with balanced air pressures on both sides of the piston to prevent the rod from jumping abruptly. For safety-critical applications, install an independent external mechanical lock. This single-rod configuration accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts, uses PT tapered ports, and features a sturdy M27x2 rod thread that handles high side loads. Even with a 200 mm stroke, external guidance is recommended to prevent rod binding.
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 BSAI125X200S FAQ
It uses a spring-applied, air-released mechanism to grip the piston rod at any position along the stroke, delivering a static holding force of 8600 N. The lock engages after the cylinder stops and requires balanced air pressure via the G1/8 enclasp port to release safely.
The BSAI locks at ANY position along the stroke, whereas the SAIL only holds at the stroke end. Additionally, the BSAI clamp locks after the rod stops and cannot brake a moving load, requiring balanced pressures to unlock without jumping.
Related AirTAC Lock & Standard Cylinders
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