Airtac BSAI Locking Clamp Cylinder BSAI50X75S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X75S is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 75mm 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
- Stroke75 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 BSAI50X75S
The AirTAC BSAI50X75-S is a double-acting ISO 15552 profile cylinder equipped with a spring-applied, air-released clamp-lock mechanism. Unlike a standard SAI cylinder, this enclasp unit grips the carbon steel piston rod at any position along its 75 mm travel, delivering a static holding force of 1400 N. It generates 982 N of push thrust and 825 N of pull thrust at 0.5 MPa. Remember that the 1400 N clamp holding force is a separate quantity from the cylinder thrust; always size the holding capacity against your static load, not the pneumatic force.
This model includes a -S magnet for precise position sensing via AirTAC CMSE (reed) or DMSE (electronic) switches fitted into the dual-side sensor grooves. The clamp operates through a dedicated G1/8 enclasp port, distinct from the 1/4 cylinder ports. Note that the variable air cushions only decelerate the piston near the stroke ends; the mechanical clamp is the sole device responsible for maintaining the hold.
Airtac BSAI Locking Clamp Cylinder BSAI50X75S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X75S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 75 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 BSAI50X75S Is Used
Vertical Axis Hold
Locks a lifted load at any intermediate height along the vertical stroke, preventing gravity-driven drops during operation.
Power Loss Safety
The spring-applied clamp engages automatically upon air loss, freezing the rod exactly where it stopped to secure the workpiece.
Machining Position Hold
Provides a rigid, 1400 N lock to immobilize a part at a custom mid-stroke position for precise drilling or inspection.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X75S the Right Clamp-Lock?
Choose this 50 mm bore when an application requires mid-stroke holding that a SAIL model cannot provide, as SAIL only locks at stroke ends. If your load requires less holding power, stepping down to a 40 mm bore provides 900 N of holding force and 628 N push thrust at 0.5 MPa. Conversely, a 63 mm bore upgrades you to 2200 N holding force and 1559 N thrust. For tasks needing no mid-travel lock, a plain SAI cylinder is sufficient.
This BSAI50X75-S features a 20 mm rod and M16x1.5 thread, offering robust side-load resistance for its compact stroke. It operates at 0.15-0.7 MPa with PT ports, and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, or TCM2 mounts. The clamp locks only after the rod stops; it cannot brake a moving load. Always balance the air pressure on both sides of the piston before unlocking, or the rod may jump abruptly. For safety-critical applications, install an independent external 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 BSAI50X75S FAQ
The clamp-lock provides a static holding force of 1400 N. It is bidirectional, meaning it holds the load securely whether the rod was extending or retracting, and it can lock at any position along the 75 mm stroke.
The clamp uses a dedicated G1/8 enclasp port and requires balanced air pressure on both sides of the piston to unlock. If pressures are not balanced when released, the rod can move abruptly. The lock only engages after the rod has stopped; it cannot brake a moving rod.
Related AirTAC Lock & Standard Cylinders
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