Airtac BSAI Locking Clamp Cylinder BSAI40X175
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X175 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 175mm 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
- Stroke175 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 BSAI40X175
The AirTAC BSAI40X175 is a double-acting ISO 15552 profile cylinder with a built-in clamp-lock mechanism. A spring-applied, air-released gripper clamps the 16mm carbon steel piston rod, holding the load at any position along the 175mm stroke with a static holding force of 900 N. The cylinder delivers 628 N of thrust at 0.5 MPa (879 N at 0.7 MPa). Remember that holding force and thrust are distinct quantities: you must size the 900 N clamp against your static load, not the cylinder's push force.
This enclasp unit uses a third G1/8 port to release the lock at 0.15-0.7 MPa. The clamp locks only after the rod stops; it cannot brake a moving load. Furthermore, the variable air cushion merely decelerates the piston near stroke ends—it is never the holding device. You must unlock with balanced pressures on both sides of the piston, or the rod may jump abruptly.
Airtac BSAI Locking Clamp Cylinder BSAI40X175 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X175 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 175 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 BSAI40X175 Is Used
Vertical Axis Holding
Prevents gravity-driven drops on vertical strokes by clamping the rod anywhere along the travel path.
Power Loss Safety
Spring-applied grip maintains the 900 N hold during sudden air or electrical power loss.
Machining Position Lock
Secures the workpiece at a precise intermediate point for machining or inspection.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X175 the Right Clamp-Lock?
Choose this 40mm bore when a 32mm bore (402 N thrust, 600 N holding) lacks the capacity for your static load, but a 50mm (982 N thrust, 1400 N holding) is oversized. Step up from a plain SAI cylinder when you need to hold a position mid-stroke rather than just at the end. The BSAI40X175 uses PT tapered ports, a 1/4 cylinder port, and accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. Without a magnet (-S), it cannot use CMSE reed or DMSE solid-state sensors.
For safety-critical applications, add an independent external measure, as the clamp is not a moving-rod brake. The 16mm rod with an M12x1.25 thread handles moderate side loads well. At 175mm stroke, side-load stress is minimal, but always ensure external guidance for heavy offset loads to prevent binding.
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 BSAI40X175 FAQ
The clamp-lock provides a static holding force of 900 N at any position along the stroke. This is separate from the 879 N thrust at 0.7 MPa, so always size the clamp against the static load.
No, the clamp locks only after the cylinder has stopped; it cannot brake a moving rod. You must balance air pressure on both sides before unlocking, or the rod may jump abruptly.
Related AirTAC Lock & Standard Cylinders
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