Airtac BSAI Locking Clamp Cylinder BSAI80X900S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI80X900S is a genuine double-acting ISO 15552 cylinder with a Ø80mm 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 3600 N.
- BoreØ80 mm
- Stroke900 mm
- Cylinder portG3/8
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM20×1.5
About the Airtac BSAI Locking Clamp Cylinder BSAI80X900S
The AirTAC BSAI80X900-S is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock. It secures the carbon steel rod at any position along its 900mm travel, providing a static holding force of 3600 N. Because it includes a magnet (-S), it integrates seamlessly with AirTAC CMSE reed and DMSE solid-state sensors for precise position feedback. Operating at 0.15-0.7 MPa, it generates a practical maximum push thrust of 3518 N.
It is crucial to distinguish this 3600 N holding force from the cylinder's 3518 N thrust; the clamp sustains the static load, while thrust dictates movement. The lock engages only after the rod has completely stopped, serving as a position holder rather than a braking device for a moving rod. Furthermore, the variable air cushion at the stroke ends only decelerates the piston and is not the mechanism holding the load. Unlocking requires a third G1/8 enclasp port and balanced air pressures on both sides of the piston to prevent the rod from jumping abruptly upon release.
Airtac BSAI Locking Clamp Cylinder BSAI80X900S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI80X900S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø80 mm |
| Stroke | 900 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G3/8 |
| Rod thread | M20×1.5 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 3600 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 (Ø80 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 (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa (max) | 3519 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (3600 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI80X900S Is Used
Vertical Axis Load Holding
Maintains a heavy vertical workpiece securely at any mid-stroke height during power loss, utilizing the 3600 N clamp instead of relying solely on thrust pressure.
Machining Position Lock
Locks the 900mm stroke rigidly in place for machining or inspection tasks, ensuring the carbon steel rod does not drift under cutting forces.
Emergency Safety Hold
Provides a fail-safe drop prevention on long-stroke handling axes by gripping the rod instantly once motion stops, requiring balanced pressure to release safely.
Is the Airtac BSAI Locking Clamp Cylinder BSAI80X900S the Right Clamp-Lock?
Choose this 80mm bore model when an application demands secure mid-stroke holding that a stroke-end-only lock like the SAIL cannot provide, or when a plain SAI cylinder lacks fail-safe load security. If the 3518 N thrust or 3600 N holding capacity is insufficient, stepping up to the 100mm bore yields 3927 N thrust at 0.5 MPa and a 5500 N hold; if lower force is acceptable, the 63mm bore offers 1559 N thrust and a 2200 N hold. At 900mm, this standard stroke is well within the 1000mm maximum but requires an external guide to prevent side-loading damage to the M20x1.5 rod thread.
For safe operation, remember the clamp locks bidirectionally only after the cylinder stops and cannot brake a moving load. Safety-critical applications require an additional independent safety measure. The unit features PT tapered threads, a 3/8 cylinder port, and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Ensure pressures are balanced before supplying the G1/8 unlock port to prevent sudden rod movement.
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 BSAI80X900S FAQ
The built-in spring-applied clamp provides a static holding force of 3600 N. It locks the rod bidirectionally at any position along the 900mm stroke, but only engages after the cylinder has completely stopped moving.
The clamp is released via a third G1/8 enclasp port. To prevent the rod from jumping abruptly, the air pressures on both sides of the piston must be balanced before unlocking. The lock holds the load, while the air cushion only decelerates the piston near stroke ends.
Related AirTAC Lock & Standard Cylinders
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