Airtac BSAID Clamp Cylinder BSAID125X400S
The AirTAC Airtac BSAID Clamp Cylinder BSAID125X400S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 400mm 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
- Stroke400 mm
- Cylinder portG1/2
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAID Clamp Cylinder BSAID125X400S
The AirTAC BSAID125X400-S is a double-acting ISO 15552 profile cylinder featuring a double-rod layout and a spring-applied, air-released clamp-lock mechanism. It delivers equal thrust in both directions—5734N at 0.5MPa—and its integrated enclasp gripper secures the rod at any position along the 400mm travel, providing a robust static holding force of 8600N. Remember that holding force and thrust are distinct quantities: you must size the 8600N clamp rating against your static load, not the pneumatic thrust.
Designed for dual-side guidance, the second rod exits the rear cap to mount a counterweight, position flag, or secondary tool while resisting rotation. The clamp uses a dedicated G1/8 enclasp port alongside the 1/2 cylinder ports, and it requires balanced piston pressure to unlock safely. The variable air cushions only decelerate the piston near stroke ends; the mechanical clamp is the sole device holding the load.
Airtac BSAID Clamp Cylinder BSAID125X400S Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID125X400S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 BSAID125X400S Is Used
Vertical Lift Anti-Drop
Holds a heavy vertical workpiece securely at any elevation during power loss, relying on the 8600N static clamp rather than live air pressure.
Machining Position Hold
Freezes the dual-rod carriage mid-stroke so a heavy part can be inspected or machined without drift, utilizing equal force on both rod ends.
Dual-Tool Transfer
Mounts a primary workpiece on the front rod and a counterweight or position flag on the rear rod, ensuring balanced, anti-rotation handling.
Is the Airtac BSAID Clamp Cylinder BSAID125X400S the Right Clamp-Lock?
Choose this 125mm bore double-rod model when your application demands equal push/pull force and anti-rotation guidance. If your load requires less force, stepping down to the 100mm bore yields 3681N thrust and a 5500N hold. The BSAID125X400-S is preferred over a stroke-end-only SAIL cylinder when you must freeze the load mid-travel. It is a true ISO 15552 profile cylinder, dimensionally interchangeable with standard mounting footprints.
The clamp locks only after the rod has stopped and cannot brake a moving load; safety-critical applications require an independent external measure. Unlocking demands balanced air pressure to prevent abrupt rod jumps. This unit includes a PT-threaded port layout, an -S magnet for CMSE reed and DMSE electronic sensors, and accepts Basic, FA, LB, TC, TCM1, and TCM2 mounts. Given the 400mm stroke and heavy 32mm rod, external side-load guidance is highly recommended.
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 BSAID125X400S FAQ
The spring-applied, air-released enclasp mechanism clamps the 32mm rod at any position along the 400mm stroke, providing an 8600N static holding force. It locks bidirectionally, holding the load whether the rod was extending or retracting.
The clamp locks only after the cylinder has stopped and cannot brake a moving rod. To unlock it safely, the air pressures on both sides of the piston must be balanced via the G1/8 enclasp port; otherwise, the rod may jump abruptly. Safety-critical loads need an independent backup measure.
Related AirTAC Lock & Standard Cylinders
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