Airtac BSAID Clamp Cylinder BSAID125X350
The AirTAC Airtac BSAID Clamp Cylinder BSAID125X350 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 350mm 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
- Stroke350 mm
- Cylinder portG1/2
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAID Clamp Cylinder BSAID125X350
The AirTAC BSAID125X350 is a double-acting ISO 15552 profile cylinder featuring a rod extending from both ends and an integrated spring-applied, air-released clamp-lock. It delivers an equal thrust of 5734 N in both push and pull directions at 0.5 MPa. A defining feature is its ability to lock the piston at any position along its 350 mm travel, providing a static holding force of 8600 N. You must size this holding capacity against your static load, as the holding force is entirely separate from the cylinder thrust.
This enclasp mechanism grips the carbon steel rod bidirectionally, but it only engages after the cylinder has stopped, meaning it cannot brake a moving load. Unlocking requires balanced air pressure across the piston via the dedicated G1/8 port, preventing abrupt rod jumps. The double-rod design allows mounting a workpiece on one end and a guide or counterweight on the other, while the variable air cushions merely decelerate the piston near stroke ends without contributing to the hold.
Airtac BSAID Clamp Cylinder BSAID125X350 Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID125X350 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 BSAID125X350 Is Used
Vertical Load Holding
Secures heavy vertical loads at any point in the 350 mm travel, preventing descent during power loss.
Machining Position Hold
Locks the double-rod assembly rigidly mid-stroke to withstand machining forces without drifting.
Dual-Side Safety Gate
Uses one rod end for the gate and the other for a counterweight, holding the assembly securely open.
Is the Airtac BSAID Clamp Cylinder BSAID125X350 the Right Clamp-Lock?
Select this 125 mm bore when an application demands high equal force both ways and intermediate position holding. If the 8600 N holding capacity or 5734 N thrust exceeds your load requirements, stepping down to the 100 mm bore offers 5500 N hold and 3681 N pull thrust. Choose this BSAID model over a stroke-end-only SAIL lock when you need the load secured anywhere in the 350 mm travel. Because the stroke is 350 mm, the M27x2 rod diameter provides substantial rigidity, but an external guide is recommended to manage side loads.
As a replacement match, ensure you specify the double-rod configuration, 125 mm bore, 350 mm stroke, and PT tapered ports (1/2 inch cylinder ports plus the G1/8 unlock port). The mounting interface is dimensionally interchangeable per ISO 15552, accepting Basic, FA, LB, TC, TCM1, or TCM2 brackets (omitting FB, CA, CB, and CR). Standard models lack a magnet; add an -S suffix if CMSE reed or DMSE electronic sensors are needed for position feedback. Remember that safety-critical applications require an independent external safety measure, as the clamp is not a dynamic brake.
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 BSAID125X350 FAQ
It uses a spring-applied, air-released mechanism to grip the rod at any position with an 8600 N static holding force. The clamp engages only after the cylinder stops and cannot brake a moving rod.
You must apply 0.15-0.7 MPa of air to the G1/8 enclasp port only after the pressures on both sides of the piston are balanced. Otherwise, the rod can move abruptly upon release.
Related AirTAC Lock & Standard Cylinders
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