Airtac BSAID Clamp Cylinder BSAID40X300S
The AirTAC Airtac BSAID Clamp Cylinder BSAID40X300S 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
- TypeDouble rod (BSAID)
- 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 BSAID Clamp Cylinder BSAID40X300S
The AirTAC BSAID40X300-S is a double-acting ISO 15552 profile cylinder featuring a double-rod configuration and a built-in clamp-lock mechanism. A spring-applied, air-released gripper clamps the piston rod to secure the load at any position along the 300 mm stroke, providing a static holding force of 900 N. Because it is a double-rod design, the thrust is equal in both directions at 528 N at 0.5 MPa, and the second rod allows you to mount a workpiece on one end and a guide or position flag on the other.
It is critical to distinguish this 900 N static holding force from the cylinder thrust; you must size the clamp holding force against your static load, not the push or pull thrust. The clamp uses a separate G1/8 enclasp port to release the rod, requiring a balanced air pressure between 0.15 and 0.7 MPa to unlock safely. Note that the variable air cushion only decelerates the piston near the stroke ends, while the clamp mechanism is solely responsible for holding the load.
Airtac BSAID Clamp Cylinder BSAID40X300S Technical Specifications
| Model | Airtac BSAID Clamp Cylinder BSAID40X300S |
|---|---|
| Series | BSAI ISO 15552 clamp-lock cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 mm |
| Type | Double rod (BSAID), 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 | — |
Equal force both directions (double rod). 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 BSAID Clamp Cylinder BSAID40X300S Is Used
Vertical Mid-Stroke Hold
Secures a vertically lifted payload at any point in the 300 mm travel, preventing drops during an air loss event while utilizing the second rod for anti-rotation guidance.
Machining Position Lock
Holds a part rigidly at a specific intermediate stroke position for a machining or inspection process, using the 900 N clamp force rather than relying on live air pressure.
Dual-Side Emergency Stop
Maintains the exact position of a dual-ended tooling setup when power is removed, locking the carbon steel rod instantly once motion ceases to stabilize the assembly.
Is the Airtac BSAID Clamp Cylinder BSAID40X300S the Right Clamp-Lock?
Choose this double-rod clamp-lock cylinder when an application requires securing a load mid-stroke rather than just at the end, which is where a SAIL cylinder falls short. If your load requires less holding force, stepping down is not an option in this bore size, but stepping up to a 50 mm bore increases the holding force to 1400 N and the equal thrust to 825 N. If mid-stroke locking is unnecessary, a plain SAID cylinder suffices. This 300 mm stroke requires an external guide to prevent side-loading, though the 16 mm carbon steel rod and M12x1.25 thread handle moderate loads well.
As a replacement match, ensure you specify the double-rod layout, 40 mm bore, 300 mm stroke, and PT tapered ports. The mounting set for this double-rod version omits the FB, CA, CB, and CR brackets, accepting only Basic, FA, LB, TC, TCM1, and TCM2 mounts. The included -S magnet works with AirTAC CMSE reed and DMSE electronic sensors. Remember that the clamp locks only after the cylinder has stopped and cannot brake a moving rod; safety-critical applications need an independent safety measure.
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 BSAID Clamp Cylinder BSAID40X300S FAQ
The 900 N static holding force is the capacity of the clamp-lock mechanism to hold the rod in place at any position, which is entirely separate from the 528 N equal push and pull thrust generated by the air cylinder at 0.5 MPa. You must size the holding force against the static load weight, not the cylinder thrust.
The clamp is spring-applied and locks only after the cylinder has stopped; it cannot brake a moving rod. To unlock it safely via the G1/8 enclasp port, the air pressures on both sides of the piston must be balanced, otherwise the rod can move abruptly upon release, making an additional independent safety measure necessary for human-safety applications.
Related AirTAC Lock & Standard Cylinders
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