Airtac BSAID Clamp Cylinder BSAID125X300
The AirTAC Airtac BSAID Clamp Cylinder BSAID125X300 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 300mm 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
- Stroke300 mm
- Cylinder portG1/2
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAID Clamp Cylinder BSAID125X300
The AirTAC BSAID125X300 is a double-acting ISO 15552 profile cylinder featuring a rod extending from both ends and an integrated clamp-lock mechanism. A spring-applied, air-released gripper clamps the piston rod to secure the load at any position along the 300 mm travel, delivering a static holding force of 8600 N. Because it is a double-rod design, the thrust is equal in both directions at 5734 N (at 0.5 MPa). It is crucial to distinguish this holding force from the cylinder thrust: the 8600 N rating defines the clamp's static grip against the load, not the pneumatic push or pull capability.
This enclasp mechanism is bidirectional and operates via a third G1/8 unlock port, separate from the two 1/2 cylinder ports. The rod out both ends allows you to mount a workpiece on one side and a guide or position flag on the other for dual-side anti-rotation. Remember that the variable air cushion only decelerates the piston near stroke ends; the clamp is the sole device holding the load. The clamp locks only after the rod has stopped, and it requires balanced air pressure (0.15-0.7 MPa) to unlock safely without sudden rod movement.
Airtac BSAID Clamp Cylinder BSAID125X300 Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID125X300 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 BSAID125X300 Is Used
Vertical Axis Hold
Freezes heavy vertical loads at any point in the 300 mm travel with 8600 N of static grip, preventing drops during power loss.
Machining Position Lock
Secures a dual-sided workpiece rigidly for machining or inspection, using the second rod for a position flag or counterweight.
Emergency Stop Hold
Clamps the rod bidirectionally after the cylinder stops to maintain a safe state during an unexpected pneumatic shutdown.
Is the Airtac BSAID Clamp Cylinder BSAID125X300 the Right Clamp-Lock?
Choose this 125 mm bore if your application requires substantial equal force both ways (5734 N at 0.5 MPa) combined with heavy mid-stroke holding. If you do not need double-rod functionality, the single-rod BSAI125X200 provides the same 8600 N holding grip but higher forward thrust (6136 N at 0.5 MPa). Alternatively, if holding is only required at the stroke end, a SAIL cylinder suffices, but choose this BSAID model when the load must be frozen at any arbitrary position. For lighter vertical axes, the 100 mm bore offers 3681 N pull thrust and a 5500 N holding force.
As a direct replacement, match the double-rod configuration, 125 mm bore, 300 mm stroke, and PT port threads. The BSAID mounting set omits FB, CA, CB, and CR brackets, supporting only Basic, FA, LB, TC, TCM1, and TCM2. The robust 32 mm rod with an M27x2 thread handles high side loads well, but at 300 mm stroke you should still use an external guide to prevent binding. This unit has no magnet; add an -S suffix if CMSE reed or DMSE electronic sensors are needed. Always ensure the rod has stopped before clamping, and balance pressures before unlocking, adding independent safety measures for human safety.
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 BSAID125X300 FAQ
It uses a spring-applied, air-released gripper that clamps the rod at any position along the stroke, providing an 8600 N static holding force. The clamp is bidirectional and holds the load independently of the cylinder's 5734 N thrust.
The clamp locks only after the cylinder has stopped and cannot brake a moving rod. To unlock it safely via the G1/8 port, the air pressures on both sides of the piston must be balanced; otherwise, the rod may jump abruptly. Human-safety applications require an additional independent safety measure.
Related AirTAC Lock & Standard Cylinders
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