Airtac BSAI Locking Clamp Cylinder BSAI125X225S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI125X225S is a genuine double-acting ISO 15552 cylinder with a Ø125mm bore, 225mm 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
- Stroke225 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 BSAI125X225S
The AirTAC BSAI125X225-S 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 225 mm travel, delivering a robust static holding force of 8600 N. A core distinction to understand is that this holding force is entirely separate from the cylinder's 6136 N thrust at 0.5 MPa; you must size the clamp's 8600 N capacity against your static load, not the pneumatic push force.
This bidirectional enclasp locks whether the rod was extending or retracting, but it only engages after the rod has completely stopped, meaning it cannot brake a moving load. Unlocking requires feeding a separate G1/8 enclasp port with 0.15-0.7 MPa to overcome the spring. The integrated variable air cushion only decelerates the piston near stroke ends and does not contribute to holding the load. Equipped with a magnet (-S), it supports AirTAC CMSE reed and DMSE solid-state sensors in the dual-side grooves.
Airtac BSAI Locking Clamp Cylinder BSAI125X225S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI125X225S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 225 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 BSAI125X225S Is Used
Vertical Load Holding
Freezes heavy vertical workpieces at any height along the 225 mm travel, preventing gravity-driven drops during an air pressure loss.
Machining Position Freeze
Secures a heavy fixture mid-stroke so machining or inspection processes can occur without pneumatic pressure fluctuations shifting the load.
Mid-Travel Emergency Stop
Holds the rod securely in place anywhere in the stroke if power or air supply fails, acting as a bidirectional safety lock once motion ceases.
Is the Airtac BSAI Locking Clamp Cylinder BSAI125X225S the Right Clamp-Lock?
Choose this 125 mm bore when an application requires holding a heavy load mid-stroke without maintaining live air pressure, stepping up from the 100 mm bore which offers 3927 N thrust and 5500 N holding force. A plain SAI cylinder suffices if you only need standard actuation without intermediate locking, while a SAIL variant only secures the rod at stroke ends. The BSAI is necessary when the load must freeze at any point in the travel.
Remember the clamp engages only after the cylinder halts, and unlocking demands balanced pressures on both piston sides to prevent the rod from jumping abruptly; safety-critical applications require an independent external measure. This model features PT tapered port threads (1/2 inch cylinder ports plus the G1/8 unlock port) and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. The M27x2 rod thread provides substantial side-load capacity, though strokes over 300 mm would still need an external guide.
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 BSAI125X225S FAQ
The clamp-lock provides a static holding force of 8600 N. It is bidirectional and locks the rod at any position along the stroke, but it only engages after the cylinder has stopped moving.
The clamp is released by applying 0.15-0.7 MPa to the G1/8 enclasp port, but only after the air pressures on both sides of the piston are balanced to prevent the rod from jumping. The variable air cushion only decelerates the piston at stroke ends and does not hold the load.
Related AirTAC Lock & Standard Cylinders
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