Airtac BSAID Clamp Cylinder BSAID125X25S
The AirTAC Airtac BSAID Clamp Cylinder BSAID125X25S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 25mm 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
- Stroke25 mm
- Cylinder portG1/2
- TypeDouble rod (BSAID)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAID Clamp Cylinder BSAID125X25S
The AirTAC BSAID125X25-S is a double-acting ISO 15552 profile cylinder featuring a rod extending from both ends and an integrated spring-applied, air-released clamp-lock. Because it is a double-rod unit, the thrust is identical in both directions at 5734 N (0.5 MPa), while the robust enclasp mechanism provides a formidable static holding force of 8600 N. Buyers must distinguish between these two metrics: the cylinder thrust moves the load, but the clamp holding force is what secures the static payload.
This bidirectional lock engages at any position along the 25 mm stroke once the piston stops. It is crucial to understand that the variable air cushion only decelerates the piston near stroke ends; the clamp is the sole device holding the load. Furthermore, the clamp requires a third G1/8 pneumatic port to release, and pressures on both sides of the piston must be balanced during unlocking to prevent the rod from jumping abruptly.
Airtac BSAID Clamp Cylinder BSAID125X25S Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID125X25S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 25 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 BSAID125X25S Is Used
Heavy Machining Hold
Secures a massive metal workpiece at an exact intermediate stroke position for multi-axis machining, preventing drift under cutting forces.
Vertical Payload Arrest
Locks a heavy vertical lift platform instantly upon power loss, holding the 8600 N load safely at any height without relying on air pressure.
Dual-Side Tooling
Uses the second rod end for mounting a guide or anti-rotation flag, ensuring perfectly balanced dual-side guidance during clamping operations.
Is the Airtac BSAID Clamp Cylinder BSAID125X25S the Right Clamp-Lock?
Choose this 125 mm bore model when an application demands extreme holding capacity (8600 N) and equal force both ways, such as mounting a heavy workpiece on one rod end and a counterweight or position flag on the opposite end. If you do not require dual-side guidance or equal push/pull force, a single-rod BSAI125X25-S offers the same holding power. Conversely, if you only need to secure a load at the stroke ends rather than anywhere in transit, a SAIL cylinder suffices.
As a replacement, verify the 125 mm bore, 25 mm stroke, PT ported 1/2 cylinder threads, and the double-rod design. The -S magnet works with AirTAC CMSE reed and DMSE solid-state sensors. Mounting is limited to Basic, FA, LB, TC, TCM1, and TCM2 (omitting FB/CA/CB/CR). The 32 mm carbon steel rod and M27x2 thread handle high side-loads, though the clamp only engages after the rod fully stops and requires balanced pressure to unlock safely.
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 BSAID125X25S FAQ
The clamp-lock provides a static holding force of 8600 N. It locks the rod at any position bidirectionally, but only after the cylinder has stopped moving; it cannot brake a moving rod.
The clamp is spring-applied and air-released via a third G1/8 port. To prevent the rod from jumping abruptly, the air pressures on both sides of the piston must be balanced before unlocking, and an independent safety measure is required for human-safety loads.
Related AirTAC Lock & Standard Cylinders
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