Airtac BSAI Locking Clamp Cylinder BSAI125X1000
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X1000 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 1000mm 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
- Stroke1000 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X1000
The AirTAC BSAI125X1000 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released clamp-lock mechanism. It secures the carbon steel piston rod at any position along its 1000 mm travel, delivering a static holding force of 8600 N. Because it is a profile cylinder rather than a tie-rod design, it integrates cleanly into standard tooling. The 125 mm bore generates 6136 N of push thrust at 0.5 MPa, or up to 8590 N at the series maximum 0.7 MPa operating pressure.
It is vital to distinguish this 8600 N holding force from the cylinder thrust; you must size the clamp against the static load weight, not the actuator's push power. The clamp operates via a separate G1/8 enclasp port and locks only after the rod has come to a complete stop, meaning it cannot function as a braking device for a moving load. Furthermore, the variable air cushions at stroke ends only decelerate the piston; the mechanical clamp is the sole device responsible for maintaining position.
Airtac BSAI Locking Clamp Cylinder BSAI125X1000 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X1000 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 1000 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 BSAI125X1000 Is Used
Vertical Axis Drop Prevention
Secures heavy vertical lifting platforms at any intermediate height, holding the load safely with 8600 N of force during air pressure loss.
Machining Position Hold
Locks a heavy workpiece rigidly in place at a specific intermediate stroke position for machining or inspection operations without relying on air pressure.
Emergency Safety Stop
Provides a reliable mechanical hold for safety-critical loads once the cylinder has stopped, acting as an independent secondary safety measure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X1000 the Right Clamp-Lock?
Choose this 125 mm bore when a smaller neighbor like the 100 mm (offering 3927 N thrust at 0.5 MPa and a 5500 N hold) cannot support your payload. If full-stroke actuation is needed without intermediate stops, a plain SAI cylinder suffices, while a SAIL is adequate if you only require holding at the stroke ends. For this BSAI model, the lock engages bidirectionally anywhere in the 1000 mm travel but requires balanced air pressure on both sides of the piston via the G1/8 port to unlock safely; otherwise, the rod may jump abruptly.
As a replacement match, ensure single-rod configuration, 125 mm bore, 1000 mm stroke, and PT tapered ports. Mounting options include Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2. Because this stroke is 1000 mm, the M27x2 rod thread provides robust support, but an external guide is highly recommended to prevent excessive side-loading on long unsupported spans. This unit ships without a magnet; add an -S suffix if CMSE reed or DMSE electronic sensors are required.
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 BSAI125X1000 FAQ
It uses a spring-applied, air-released mechanism that clamps the rod bidirectionally at any position along the 1000 mm stroke, providing a static holding force of 8600 N. It requires a separate G1/8 enclasp port to release the grip.
No, the clamp locks only after the cylinder has stopped and cannot brake a moving rod. It must be unlocked with balanced air pressures on both sides of the piston to prevent the rod from jumping, and human-safety applications require an additional independent safety measure.
Related AirTAC Lock & Standard Cylinders
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