Description
KF Stainless Steel Vacuum Line Adapter Pipe Fitting OD 3-1/16" to 1" ID 3/8"
This is an unbranded KF-style stainless steel vacuum line adapter designed to transition between two different outer diameter vacuum lines while maintaining a 3/8" inner diameter through-bore on both ends. The fitting features a brass knurled locking nut and a yellow O-ring seal for a vacuum-tight connection. Construction is primarily stainless steel with a brass clamping ring.
Specifications & What's Included
- Type: KF / NW-style vacuum line adapter / pipe fitting
- Material: Stainless steel body and flange; brass knurled locking nut
- Opening 1 — Outer Diameter: 3-1/16"
- Opening 1 — Inner Diameter: 3/8"
- Opening 2 — Outer Diameter: 1"
- Opening 2 — Inner Diameter: 3/8"
- Seal: Yellow O-ring included and present
- Locking mechanism: Brass knurled clamping nut
- Flange style: Flat disc flange on large-OD end
- Inner bore: Clear and unobstructed on both ends
Applications
KF (also known as NW or ISO-KF) fittings are a widely used quick-connect flange standard in vacuum systems across research, industrial, and semiconductor processing environments. This style of adapter is used to connect vacuum lines, pumps, chambers, gauges, and other components of different diameters within a vacuum system. The O-ring and knurled clamping nut provide a repeatable, tool-free seal that holds vacuum. Typical applications include laboratory vacuum systems, vacuum deposition chambers, freeze-drying equipment, mass spectrometry systems, and general vacuum plumbing where a size transition between lines is needed. The stainless steel construction makes these fittings compatible with corrosive process gases and high-cleanliness environments.
This KF stainless steel vacuum line adapter was pulled from a working vacuum system and has been inspected. It is in good used condition overall. The stainless steel flange face and body show surface oxidation and staining consistent with vacuum service use — visible on the flange disc face and outer body. The brass knurled locking nut is intact and turns freely. The yellow O-ring seal is present. The inner bore on both ends is clear and unobstructed. No cracks, deformation, or damage to the sealing surfaces were observed. Please view our photo set and contact us if you have any questions. Please note: We have multiple units in stock — yours may not be the one shown in the photos, however, it will be similar in condition and function.
Warranty Information
Additional Information
Brand: |
Unbranded |
Model: |
KF Vacuum Line Adapter |
Type: |
Vacuum Line Adapter / Pipe Fitting |
SKU: |
40972 |
Material: |
Stainless Steel with Brass Knurled Locking Nut |
Opening 1 OD: |
3-1/16" |
Opening 1 ID: |
3/8" |
Opening 2 OD: |
1" |
Opening 2 ID: |
3/8" |
Seal Type: |
O-Ring (Yellow) |
Connection Type: |
KF / NW Flange |
Condition: |
Used – Pulled from Working Environment |
Application: |
Vacuum System, Vacuum Chamber |
Seller Notes: |
Includes yellow O-ring seal and brass knurled locking nut |
Condition Notes: |
KF stainless steel vacuum line adapter pulled from a working vacuum system. Inspected — good used condition. Surface oxidation and staining on flange face and body. Brass knurled nut intact, yellow O-ring present, bore clear. |
