Airtac BSAI Locking Clamp Cylinder BSAI125X500
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X500 is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 500mm 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
- Stroke500 mm
- Cylinder portG1/2
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM27×2
About the Airtac BSAI Locking Clamp Cylinder BSAI125X500
The AirTAC BSAI125X500 is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. It secures the 32 mm carbon steel piston rod at any position along its 500 mm stroke, delivering a static holding force of 8600 N. The base cylinder generates a push thrust of 6136 N at 0.5 MPa, but remember that holding force and thrust are distinct quantities: you must size the clamp's 8600 N capacity against your static load, not the cylinder's propulsion thrust.
This enclasp unit operates bidirectionally and requires a third G1/8 pneumatic port to release the lock. It functions only after the rod has come to a complete halt; it cannot brake a moving load. The variable air cushions at the stroke ends decelerate the piston, but the clamp itself is the sole device responsible for holding the load. For position feedback, a magnet can be added to enable CMSE reed or DMSE electronic sensors.
Airtac BSAI Locking Clamp Cylinder BSAI125X500 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X500 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 500 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 BSAI125X500 Is Used
Vertical Load Holding
Prevents heavy elevated platens from crashing down by clamping the rod instantly upon stop, holding the weight securely anywhere in the 500 mm travel.
Power Loss Safety
The spring-applied lock engages automatically during an air or power failure, freezing the machinery in its exact current position to protect the process.
Machining Position Hold
Locks a heavy workpiece firmly in a specific intermediate stroke location for precise drilling or inspection without maintaining live air pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X500 the Right Clamp-Lock?
Choose this 125 mm bore model when a smaller 100 mm bore (offering 3927 N thrust at 0.5 MPa and 5500 N holding force) cannot safely retain your load. Conversely, if 8600 N exceeds your static requirements, stepping down saves space and air consumption. Select the BSAI clamp-lock over a SAIL model when you must secure the load somewhere in the middle of the stroke, rather than only at the stroke ends. If position holding is entirely unnecessary, a plain SAI cylinder suffices.
This single-rod configuration accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. It features PT tapered ports (1/2 inch cylinder port, G1/8 enclasp port). Operating pressure is 0.15-0.7 MPa, and speed is limited to 30-500 mm/s. Because the 500 mm stroke is substantial, an external guide rail is recommended to prevent side-loading damage to the rod seals. Always ensure pressures are balanced before unlocking to prevent abrupt rod movement, and add independent safety measures for human-safety-critical holds.
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 BSAI125X500 FAQ
The integrated clamp-lock provides a static holding force of 8600 N. It can secure the rod at any position along the 500 mm stroke, but only after the cylinder has completely stopped moving.
The lock is air-released via a third G1/8 port. You must balance the air pressures on both sides of the piston before unlocking; otherwise, the rod may jump abruptly. It is not a braking device for moving rods.
Related AirTAC Lock & Standard Cylinders
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