Airtac BSAI Locking Clamp Cylinder BSAI50X125
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X125 is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 125mm 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 1400 N.
- BoreØ50 mm
- Stroke125 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM16×1.5
- 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 BSAI50X125
The AirTAC BSAI50X125 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It secures the 20 mm carbon steel rod at any position along its 125 mm stroke, delivering a static holding force of 1400 N. The base cylinder generates 982 N of thrust at 0.5 MPa, but the clamp holding force is a separate quantity sized purely against the static load, not the cylinder thrust. This bidirectional enclasp engages only after the piston stops and cannot brake a moving rod.
Operating between 0.15 and 0.7 MPa, this unit requires a third G1/8 enclasp port to release the lock. The release requires balanced air pressure on both sides of the piston to prevent the rod from jumping abruptly. The variable air cushion at the stroke ends only decelerates the piston and does not contribute to holding the load. For position feedback, an optional -S magnet version works with AirTAC CMSE reed and DMSE electronic sensors.
Airtac BSAI Locking Clamp Cylinder BSAI50X125 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X125 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 125 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/4 |
| Rod thread | M16×1.5 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 1400 N |
| Enclasp / unlock port | G1/8 |
| Operating pressure | 0.15 – 0.7 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 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 (Ø50 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa (max) | 1374 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (1400 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI50X125 Is Used
Vertical Axis Holding
Secures a lowered vertical load at any point in the 125 mm travel, preventing gravity-driven drops when air pressure is removed.
Power Loss Safety
Engages the spring-applied clamp instantly upon air loss to freeze the piston in its current position, protecting the work area.
Machining Position Hold
Locks the rod rigidly during drilling or clamping operations, absorbing process forces up to 1400 N without pneumatic pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X125 the Right Clamp-Lock?
Choose this 50 mm bore when an application requires holding a load mid-stroke, unlike a plain SAI cylinder which cannot hold without live pressure, or a SAIL cylinder which only secures at stroke ends. If you need less force, the 40 mm bore offers 528 N thrust and 900 N holding force; if your load is heavier, the 63 mm bore provides 1402 N thrust and 2200 N holding force. The 20 mm rod and M16x1.5 thread provide robust side-load resistance for this 125 mm stroke.
To replace this model, match the single-rod configuration, 50 mm bore, 125 mm stroke, and PT tapered ports. It accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Because the clamp locks only after the cylinder stops and releases via balanced pressure, any human-safety-critical load requires 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 BSAI50X125 FAQ
The clamp-lock provides a static holding force of 1400 N. It locks at any position along the 125 mm stroke, but only after the piston has stopped moving, as it cannot brake a moving rod.
The clamp is released by applying air to the G1/8 enclasp port, but only after the air pressures on both sides of the piston are balanced. If pressures are unbalanced during release, the rod can jump abruptly.
Related AirTAC Lock & Standard Cylinders
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