KF25 Vacuum Flange to 8mm Hose Barb Adapter

Parameter Value

Vacuum Range Down to 10⁻⁵ Pa (with centering ring and clamp)

Operating Temperature -20°C ~ +150°C (limited by hose material)

Leak Rate ≤ 1×10⁻⁹ Pa·m³/s (helium leak-tested)

Max Positive Pressure ≤ 0.3 MPa (dependent on hose pressure rating)

Installation Instructions

1. Place the KF25 centering ring (with O-ring) onto the flange face.
2. Insert the flange into the mating KF port and secure with a quick-clamp.
3. Force the 8mm I.D. hose fully onto the barb end until it bottoms out.
4. Use a hose clamp or spring clamp at the barb root to prevent the hose from slipping off.

The "8mm" specification refers to the hose inner diameter, not the outer diameter.

• This adapter is not intended for rigid tubing (metal or plastic) with 8mm O.D. — use a compression-type fitting for that purpose.
• Do not tighten the clamp without the centering ring in place.
• After prolonged use or high-temperature cycling, re-tighten the hose clamp as needed.

Parameter Specification

Vacuum End KF25 (ISO-KF) quick-flange

Hose End Barbed hose nozzle

Compatible Hose I.D. 8 mm (nominal)

Recommended Hose O.D. 12–14 mm (depending on wall thickness)

Parameter Value

Flange Outer Diameter 25 mm

Max Barb Outer Diameter Approx. 11.5 mm

Number of Barbs 2–3 levels (anti-slip)

Overall Length Approx. 45–50 mm (varies by brand)

Net Weight Approx. 50 g (304 SS)

Component Material Remarks

Main Body SUS304 Stainless Steel (316L optional) Corrosion-resistant, vacuum-compatible

Surface Finish Polished / Passivated Reduces outgassing and improves cleanliness

Note: The centering ring (with O-ring) and clamp for the KF end are sold separately and not included with the adapter.