Airtac BSAI Locking Clamp Cylinder BSAI40X300
The AirTAC Airtac BSAI Locking Clamp Cylinder BSAI40X300 is a genuine double-acting ISO 15552 cylinder with a Ø40mm bore, 300mm 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
- Stroke300 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 BSAI40X300
The AirTAC BSAI40X300 is a double-acting ISO 15552 profile cylinder featuring a built-in spring-applied, air-released clamp-lock mechanism. A defining characteristic of this series is its ability to secure the piston rod at any position along its 300mm travel, providing a static holding force of 900 N. The cylinder generates 628 N of thrust at 0.5 MPa, but buyers must distinguish between thrust and holding force: thrust moves the load, while the 900 N clamp force is what sustains it statically when air pressure is removed.
This unit uses a 16mm carbon steel rod and PT tapered ports, requiring a third G1/8 enclasp port to release the brake. The variable air cushion at stroke ends only decelerates the piston to prevent impact damage; it does not hold the load. The clamp locks only after the rod has completely stopped, meaning it cannot brake a moving load, and unlocking requires balanced air pressure on both sides of the piston to prevent abrupt rod movement.
Airtac BSAI Locking Clamp Cylinder BSAI40X300 Technical Specifications
| Model | Airtac BSAI Locking Clamp Cylinder BSAI40X300 |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 BSAI40X300 Is Used
Vertical Load Holding
Secures a 40mm bore vertical axis instantly at any height, preventing drops during air pressure loss.
Power Failure Safety
Spring-applied clamp engages automatically mid-stroke to freeze the rod safely when supply air is cut.
Machining Position Hold
Locks the workpiece rigidly at a custom travel point for precise drilling or inspection without drift.
Is the Airtac BSAI Locking Clamp Cylinder BSAI40X300 the Right Clamp-Lock?
Choose this BSAI40X300 when an application demands mid-stroke holding rather than end-of-stroke locking, making it superior to a SAIL cylinder. If your load requires less holding capacity, the 32mm bore offers 600 N holding force and 402 N thrust at 0.5 MPa; for heavier loads, the 63mm bore provides 2200 N holding force and 1559 N thrust. For simple extension without mid-stroke clamping, a plain SAI cylinder suffices.
Because the 300mm stroke is relatively long for the 40mm bore, an external guide is recommended to prevent rod side-loading. This single-rod model accepts Basic, FA, FB, CA, CB, CR, LB, TC, TCM1, and TCM2 mounts. It lacks a standard magnet, so CMSE reed or DMSE electronic sensors cannot be used without modification. Always ensure the rod has stopped before applying the clamp, and add independent safety measures for human-safety-critical holds.
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 BSAI40X300 FAQ
The clamp-lock provides a static holding force of 900 N. It can secure the rod at any position along the stroke, but only engages after the cylinder has stopped moving.
The clamp is released by supplying air to the G1/8 enclasp port, but only after the air pressures on both sides of the piston are balanced. If pressures are not balanced, the rod can move abruptly upon release.
Related AirTAC Lock & Standard Cylinders
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