Airtac BSAID Clamp Cylinder BSAID125X800
The AirTAC Airtac BSAID Clamp Cylinder BSAID125X800 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
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAID Clamp Cylinder BSAID125X800
The AirTAC BSAID125X800 is a double-acting ISO 15552 profile cylinder featuring a double-rod configuration and a spring-applied, air-released clamp-lock. It delivers an equal thrust of 5734 N in both extension and retraction directions at 0.5 MPa, while the integrated enclasp mechanism provides a static holding force of 8600 N. A crucial design distinction is that this holding force is entirely separate from the cylinder thrust; you must size the 8600 N clamp capacity against your static load, not the 5734 N pneumatic drive force. The clamp locks the 32 mm rod at any position along the 800 mm stroke, but only after the piston has stopped moving.
Because it is a double-rod design, the BSAID125X800 allows you to mount a workpiece on one end and a counterweight, position flag, or secondary guide on the opposite end for dual-side anti-rotation. The lock requires a third G1/8 enclasp port to release the clamp, needing a balanced air pressure between 0.15 and 0.7 MPa to unlock safely. Remember that the variable air cushions only decelerate the piston near stroke ends; they do not hold the load. The clamp itself is the holding device.
Airtac BSAID Clamp Cylinder BSAID125X800 Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID125X800 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 mm |
| Type | Double rod (BSAID), 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 | — |
Equal force both directions (double rod). 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 BSAID Clamp Cylinder BSAID125X800 Is Used
Vertical Load Holding
Suspends heavy vertical loads at any point along the 800 mm travel using the 8600 N clamp, preventing gravity drops during air loss.
Power Failure Safety
Spring-applied enclasp engages instantly upon air pressure loss to freeze the 125 mm bore double-rod safely in place mid-stroke.
Machining Position Lock
Secures a dual-sided workpiece fixture rigidly for machining or inspection, using the second rod end for a position flag.
Is the Airtac BSAID Clamp Cylinder BSAID125X800 the Right Clamp-Lock?
Choose this 125 mm bore when an application requires substantial dual-direction force (5734 N at 0.5 MPa) and heavy load holding anywhere in the travel. If your load is lighter, stepping down to the 80 mm bore offers 2268 N thrust and a 3600 N holding force, which might suffice. The BSAID125X800 excels over a SAIL cylinder because the enclasp locks at any position rather than just at stroke ends, whereas a plain SAID suffices if no mid-stroke holding is needed. For safety, the clamp cannot brake a moving rod and only unlocks when cylinder pressures are balanced, so human-safety applications need an independent secondary measure.
As a drop-in replacement, verify the double-rod layout, 125 mm bore, 800 mm stroke, PT ported 1/2 cylinder connections, and the G1/8 enclasp port. The 32 mm rod and M27x2 thread provide high side-load capacity, but at 800 mm stroke, an external guide rail is strongly recommended to prevent rod binding. Mounting is limited to Basic, FA, LB, TC, TCM1, and TCM2 footprints, omitting FB and CA styles. If position sensing is needed, add the -S magnet option for CMSE reed or DMSE electronic 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 BSAID Clamp Cylinder BSAID125X800 FAQ
The clamp-lock provides a static holding force of 8600 N at any stroke position. The double-rod cylinder thrust is equal both ways at 5734 N (0.5 MPa). Remember that holding force and thrust are separate quantities; size the 8600 N clamp against your static load.
The spring-applied clamp locks the rod only after the cylinder has stopped moving; it cannot brake a moving rod. To unlock it safely, air pressure must be balanced on both sides of the piston via the G1/8 enclasp port, otherwise the rod may jump abruptly. Additional independent safety measures are required for human-safety loads.
Related AirTAC Lock & Standard Cylinders
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