Airtac BSAI Locking Clamp Cylinder BSAI50X900S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI50X900S 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 BSAI50X900S
The AirTAC BSAI50X900-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released clamp-lock that holds the load at any position along its 900 mm stroke. It delivers 982 N of thrust at 0.5 MPa and provides a static holding force of 1400 N. Remember that holding force and thrust are separate quantities; you must size the 1400 N clamp capacity against your static load, not the cylinder thrust.
A third G1/8 enclasp port controls the unlock function, requiring 0.15-0.7 MPa of balanced air pressure to release the grip safely. The integrated variable air cushion decelerates the piston near stroke ends but does not hold the load; only the mechanical clamp does. This unit includes a magnet for CMSE reed and DMSE solid-state sensors.
Airtac BSAI Locking Clamp Cylinder BSAI50X900S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI50X900S |
|---|---|
| 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 BSAI50X900S Is Used
Vertical Z-Axis Hold
Prevents a 50 mm bore vertical payload from dropping when air pressure drops, locking the rod securely at any intermediate Z-axis height.
Power Loss Safety
Spring-applied clamp engages instantly during an unexpected air failure, freezing the 900 mm stroke position to protect the process.
Machining Position Lock
Holds a workpiece stationary at a custom tooling point for inspection or drilling, ensuring no drift occurs during the operation.
Is the Airtac BSAI Locking Clamp Cylinder BSAI50X900S the Right Clamp-Lock?
Choose this 50 mm bore if your application requires intermediate stopping along a long 900 mm travel. If you need less force, the 40 mm bore offers 528 N thrust and 900 N holding force; for heavier loads, the 63 mm bore provides 1402 N thrust and 2200 N holding force. This BSAI model outperforms a SAIL cylinder because it locks anywhere, whereas SAIL only holds at stroke ends. If you only need standard movement without intermediate holding, a plain SAI cylinder suffices.
Because the 900 mm stroke is long and the 20 mm rod with an M16x1.5 thread is unsupported over that distance, an external guide is required to prevent side-load damage. The clamp locks only after the rod stops; it cannot brake a moving load. You must unlock it with balanced pressures or the rod may jump abruptly, meaning human-safety applications require an independent safety measure. This single-rod replacement uses PT ports, accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts, and works with CMSE/DMSE switches.
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 BSAI50X900S FAQ
The clamp-lock provides a static holding force of 1400 N. It engages via a spring to hold the rod at any position, but it only locks after the cylinder has completely stopped moving.
The clamp is released by applying 0.15-0.7 MPa of air pressure to the G1/8 enclasp port. You must balance the pressures on both sides of the piston before unlocking, or the rod may jump. Safety-critical loads require an additional independent safety measure.
Related AirTAC Lock & Standard Cylinders
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