Airtac BSAI Locking Clamp Cylinder BSAI50X900
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X900 is a genuine double-acting ISO 15552 cylinder with a Ø50mm bore, 900mm 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
- Stroke900 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 BSAI50X900
The AirTAC BSAI50X900 is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released clamp-lock mechanism. It provides a static holding force of 1400 N, gripping the 20mm carbon steel rod securely at any position along its 900mm travel. Remember that this holding force is distinct from the cylinder's 982 N thrust at 0.5 MPa; you must size the clamp's holding capacity against your static load, not the pneumatic push force. The clamp uses a third G1/8 enclasp port and requires balanced pressure to unlock safely.
Unlike standard air cushions that only decelerate the piston near stroke ends, this integrated clamp physically grips the rod to prevent movement. However, it locks only after the rod has completely stopped and cannot act as a braking device for a moving load. The lock is bidirectional, holding whether the rod was extending or retracting. For position sensing, adding a magnet allows the use of AirTAC CMSE reed or DMSE solid-state sensors in the dual-side grooves.
Airtac BSAI Locking Clamp Cylinder BSAI50X900 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X900 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø50 mm |
| Stroke | 900 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 BSAI50X900 Is Used
Vertical Axis Hold
Secures a 50mm bore lifting stage at any intermediate height along its 900mm stroke, preventing sudden drops during a power loss.
Machining Position Lock
Clamps the extended carbon steel rod with 1400 N of force to keep a workpiece fixture perfectly stationary against cutting vibrations.
Mid-Travel Inspection
Freezes a conveyor sorting arm at a precise mid-stroke location for optical inspection, holding securely without continuous air pressure.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X900 the Right Clamp-Lock?
Choose this 50mm bore model for its 1400 N holding force and 982 N thrust at 0.5 MPa. If your application requires less holding power, the 40mm bore offers 900 N holding force and 628 N thrust; if you need more, the 63mm bore provides 2200 N holding force and 1559 N thrust. Select BSAI over a SAIL model when you need the load secured at any point in the stroke, not just at the ends. If power-loss braking is unnecessary, a standard SAI cylinder suffices.
This 900mm stroke is a long unsupported travel; an external guide is highly recommended to prevent side-load damage to the 20mm rod thread and seals. The clamp locks only after the cylinder stops, and unlocking requires balanced air pressures on both sides of the piston to prevent the rod from jumping abruptly. For human-safety critical holds, add an independent mechanical measure. This single-rod configuration uses PT port threads (1/4 cylinder port, G1/8 enclasp port) and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts.
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 BSAI50X900 FAQ
The BSAI50X900 provides a static holding force of 1400 N. This bidirectional clamp grips the 20mm rod at any position along the 900mm stroke, but it only engages after the cylinder has fully stopped.
The clamp is spring-applied and air-released via a third G1/8 port. To prevent the rod from jumping abruptly, you must balance the air pressures on both sides of the piston before unlocking, ensuring the cylinder has completely stopped.
Related AirTAC Lock & Standard Cylinders
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