Airtac BSAI Locking Clamp Cylinder BSAI40X900S
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X900S is a genuine double-acting ISO 15552 cylinder with a Ø40mm 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 900 N.
- BoreØ40 mm
- Stroke900 mm
- Cylinder portG1/4
- TypeSingle rod (BSAI)
- Enclasp portG1/8
- Rod threadM12×1.25
- 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 BSAI40X900S
The AirTAC BSAI40X900-S is a double-acting ISO 15552 profile cylinder featuring a spring-applied, air-released clamp-lock mechanism. A defining trait of this series is the ability to lock the carbon steel piston rod at ANY position along its 900 mm travel, providing a static holding force of 900 N. Because this is a non-standard stroke exceeding the bore 40 maximum standard of 800 mm, it is engineered for specialized long-reach tasks. The integrated -S magnet enables position feedback via AirTAC CMSE (reed) or DMSE (electronic) switches.
It is critical to distinguish this 900 N static holding force from the cylinder thrust (628 N push at 0.5 MPa); you must size the clamp capacity against the static load weight, not the pneumatic thrust. The clamp operates via a separate G1/8 enclasp port, functioning entirely independently from the 1/4 cylinder ports. Furthermore, the variable air cushions at the stroke ends only decelerate the piston to prevent impact damage—they do not hold the load. The clamp itself is the sole holding device, engaging only after the cylinder has fully stopped.
Airtac BSAI Locking Clamp Cylinder BSAI40X900S Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X900S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 900 mm |
| Type | Single rod (BSAI), double acting |
| Cylinder port | G1/4 |
| Rod thread | M12×1.25 |
| Lock type | Spring-applied, air-released clamp (any position) |
|---|---|
| Static holding force | 900 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 800 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 (Ø40 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa (max) | 880 N | — |
Push/pull as tabulated. Rated to the 0.7 MPa operating maximum for this series. The clamp holding force (900 N) is separate from cylinder thrust. Size with a margin.
Where the Airtac BSAI Locking Clamp Cylinder BSAI40X900S Is Used
Vertical Z-Axis Mid-Stroke Hold
Secures a vertically lifted payload at any intermediate height along the 900 mm travel, preventing descent if air pressure drops.
Machining Position Lock
Clamps the carbon steel rod rigidly in place during secondary machining or inspection processes, ensuring the workpiece does not shift.
Emergency Power-Loss Safety
Acts as a fail-safe brake that engages automatically upon loss of system air, holding the load steady until pressure is restored and balanced.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X900S the Right Clamp-Lock?
Choose this specific BSAI40X900-S model when an application requires holding a load at a variable point along a 900 mm axis, where a plain SAI cylinder would fail under power loss. If the 900 N holding force is insufficient, stepping up to a bore 50 cylinder increases the clamp capacity to 1400 N and the thrust to 982 N. Conversely, if the load only needs to be secured at the fully retracted or extended end of travel, a SAIL stroke-end lock provides a simpler solution. For basic movement without any holding requirement, a standard SAI cylinder suffices.
When integrating this unit, note the 900 mm stroke demands an external guide to prevent excessive side-loading on the 16 mm rod. The clamp locks only after the rod stops; it cannot brake a moving load. Unlocking requires balanced air pressures (0.15-0.7 MPa) on both sides of the piston, or the rod may jump abruptly. For safety-critical human loads, an independent mechanical safety measure is mandatory. This replacement utilizes PT tapered ports, accepts BSAI mounting sets (Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, TCM2), and includes the -S magnet for CMSE/DMSE sensors.
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 BSAI40X900S FAQ
The clamp-lock provides a static holding force of 900 N. It is a bidirectional, spring-applied mechanism that locks the rod at any position, but it only engages after the cylinder has stopped moving and cannot be used to brake a moving load.
The clamp is released via the G1/8 enclasp port, but only after the air pressures on both sides of the piston are balanced. If the cylinder is not stopped and pressures are not equalized, the rod can move abruptly upon release. Safety-critical loads require an additional independent safety measure.
Related AirTAC Lock & Standard Cylinders
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