Airtac BSAI Locking Clamp Cylinder BSAI125X800
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X800 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 800mm 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
- Stroke800 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X800
The AirTAC BSAI125X800 is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock. It provides a robust static holding force of 8600 N, gripping the piston rod securely at any position along its 800 mm travel. Delivering a practical maximum thrust of 8590 N at 0.7 MPa, this model is built for heavy-duty load handling. A critical distinction exists between holding force and thrust: the 8600 N clamp rating is the static load capacity against gravity, entirely separate from the 8590 N pneumatic thrust used to move the mass.
The clamp mechanism engages only after the cylinder has come to a complete stop, meaning it cannot brake a moving rod. Unlocking requires balanced air pressure on both piston sides via the dedicated G1/8 enclasp port, preventing abrupt rod jumps. Remember that the variable air cushions only decelerate the piston near stroke ends; the mechanical clamp is the sole device holding the load. For position feedback, adding a -S magnet enables tracking with CMSE reed or DMSE electronic sensors.
Airtac BSAI Locking Clamp Cylinder BSAI125X800 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X800 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 BSAI125X800 Is Used
Vertical Lift Holding
Secures heavy elevated loads at any point in the 800 mm travel, preventing falls upon air pressure loss.
Machining Position Lock
Freezes the rod at a specific intermediate length for precise part profiling or inspection without drift.
Power Loss Safety
Spring-applied clamp immediately grips the rod to hold the workpiece safely if the air supply drops.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X800 the Right Clamp-Lock?
Choose this 125 mm bore when substantial thrust and holding power are required, stepping up from a 100 mm bore that offers 5500 N holding force and 5497 N thrust at 0.7 MPa. Select the BSAI clamp-lock over a SAIL model when you need to secure a load at any intermediate stroke position rather than just at the stroke end. If mid-stroke holding is unnecessary, a plain SAI cylinder suffices. This BSAI125X800 features an 800 mm stroke, PT tapered ports (1/2 inch cylinder, G1/8 enclasp), and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, or TCM2 mounts. The robust M27x2 rod thread handles high side loads well.
Because the 800 mm stroke is long and unsupported, an external guide rail is recommended to prevent rod binding. Always ensure the cylinder has stopped before applying the clamp, and verify pressures are balanced before unlocking. For safety-critical applications, install an independent mechanical restraint. Operating pressure is 0.15-0.7 MPa, and speed is limited to 30-500 mm/s.
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 BSAI125X800 FAQ
The clamp-lock provides a static holding force of 8600 N. This is the load capacity against gravity when stopped, which is separate from the 8590 N pneumatic thrust used to move the load.
No, the clamp locks only after the cylinder has stopped and cannot brake a moving rod. It must be unlocked with balanced air pressure via the G1/8 port to prevent abrupt movement, and safety-critical loads need an independent measure.
Related AirTAC Lock & Standard Cylinders
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