Airtac BSAI Locking Clamp Cylinder BSAI125X350
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X350 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
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac BSAI Locking Clamp Cylinder BSAI125X350
The AirTAC BSAI125X350 is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. It delivers 6136 N of push thrust at 0.5 MPa and features a robust 32 mm carbon steel rod with an M27x2 thread. Crucially, the 8600 N static holding force is a distinct mechanical specification from the cylinder's thrust; you must size the clamp's holding capacity against your static load, not the pneumatic push force. The enclasp grips the rod bidirectionally at any point along the 350 mm travel, locking only after the piston has come to a complete stop.
This model uses a third G1/8 enclasp port—separate from the 1/2 inch cylinder ports—to release the brake. Unlocking requires balanced air pressure on both sides of the piston; otherwise, the rod can jump abruptly upon release. The variable air cushion at the stroke ends only decelerates the piston and does not hold the load. For position feedback, an optional -S magnet works with AirTAC CMSE reed and DMSE electronic solid-state sensors.
Airtac BSAI Locking Clamp Cylinder BSAI125X350 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X350 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 mm |
| Type | Single rod (BSAI), 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 | — |
Push/pull as tabulated. 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 BSAI Locking Clamp Cylinder BSAI125X350 Is Used
Vertical Axis Load Holding
Secures heavy vertical loads at any point along the 350 mm travel, preventing gravity-driven drops when air pressure is removed.
Power Loss Emergency Hold
The spring-applied clamp engages automatically upon air loss, safely freezing the 8600 N load mid-stroke until pressure is restored.
Machining Position Lock
Locks the workpiece rigidly in place for machining or inspection operations without relying on continuous pneumatic thrust.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X350 the Right Clamp-Lock?
Choose this 125 mm bore when an 80 mm bore (which provides 2513 N thrust at 0.5 MPa and a 3600 N hold) cannot safely retain your static load. If the 8600 N clamping capacity exceeds your requirement, stepping down to a 100 mm bore yields 3927 N thrust and a 5500 N hold. Select the BSAI clamp-lock over a SAIL model when you need the rod held securely at any intermediate position, rather than only at the stroke end. If no mid-stroke holding is required, a plain SAI cylinder suffices.
To replace this unit, match the single-rod configuration, 125 mm bore, 350 mm stroke, PT port threads, and the BSAI mounting set (Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, TCM2). Because the 350 mm stroke is substantial, an external guide is recommended to prevent side-loading on the large M27x2 thread. Remember that the clamp locks only after the cylinder stops and cannot brake a moving rod; safety-critical applications require an additional independent safety measure.
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 BSAI Locking Clamp Cylinder BSAI125X350 FAQ
The clamp-lock provides a static holding force of 8600 N. It is a spring-applied, air-released mechanism that grips the rod bidirectionally at any position, but it only locks after the cylinder has completely stopped and cannot brake a moving load.
The clamp is released via a third G1/8 enclasp port. To prevent the rod from jumping abruptly, the air pressures on both sides of the piston must be balanced before unlocking. Safety-critical loads require an additional independent safety measure.
Related AirTAC Lock & Standard Cylinders
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