When building or repairing vacuum systems, choosing the right NW (KF) vacuum fittings is crucial for leak-free, durable connections. This guide highlights top NW vacuum fittings designed for compatibility with KF flanges, metal adapters, and hose barb connections. The selections emphasize material quality, corrosion resistance, and engineering precision to support consistent UHV and high-vacuum applications. Below, you’ll find 5 carefully chosen products with overview features and practical considerations to help you compare options quickly.
Product Summary
- Edwards C105-14-645 Vacuum Pump Fittings, Aluminum Adapter, NW 25 by 1/2 to 3/8″ Hose Barb — Cole-Parmer
- AVCRAY Vacuum Conical Reducer KF-25 to KF-16 (NW-25 to NW-16), 304 Stainless Steel
- SS304 KF25 Equal Tee Stainless Steel 304 KF Vacuum Fittings NW Vacuum Tee
- QiiMii KF25 Flange to 25 mm Rubber Hose Barb Adapter Fitting
- ENTERLIFE NW/KF-25 Blank Flange, 304 Stainless Steel (2 Pack)
Edwards C105-14-645 Vacuum Pump Fittings
Brand: Cole-Parmer | Type: Lab Supply | Material: Aluminum | Connection: NW 25 flange to 1/2″ to 3/8″ hose barb
The C105-14-645 adapter blends KF-NW compatibility with hose barb versatility, enabling connections from a KF 25 flange to flexible tubing. Aluminum construction provides lightweight strength and corrosion resistance suitable for laboratory environments. This fitting is designed for straightforward installation with minimal leakage risk, making it a practical choice for pump-to-system interfaces where space is constrained.
AVCRAY Vacuum Conical Reducer KF-25 to KF-16
Brand: AVCRAY | Type: Vacuum Fitting | Material: 304 Stainless Steel | Sizes: KF-25 to KF-16
This conical reducer transitions between KF16 and KF25 flanges, a common need in vacuum plumbing when integrating components with differing KF sizes. The 304 stainless steel construction ensures durability and resistance to corrosion in typical lab and industrial environments. With precise dimensions, the reducer supports leak-tight seals when paired with appropriate clamps and centering rings.
SS304 KF25 Equal Tee
Brand: QMINOX | Type: Vacuum Fittings NW Vacuum Tee | Material: 304 Stainless Steel | Connection: KF25 flange
This KO Tee functions as a three-way junction in a KF vacuum line. It adheres to ISO-KF standards and provides a robust seal when paired with a circumferential clamp and centering ring. Its 304 stainless steel construction offers reliable corrosion resistance in both laboratory and process environments, making it suitable for multi-branch vacuum plumbing layouts.
QiiMii KF25 Flange to Rubber Hose Barb Adapter
Brand: QiiMii | Type: Hose Barb Adapter | Material: 304 Stainless Steel | Flange: KF-25 | Hose: 22.2 mm inner diameter
This adapter enables KF-25 flanges to connect to standard rubber hoses via a barb connection. Stainless steel construction provides durability and compatibility with common vacuum system components. It is a practical choice when integrating flexible tubing into a KF-25 line without a full flange-to-flange transition.
ENTERLIFE Blank Flange NW/KF-25
Brand: ENTERLIFE | Type: Blank Flange | Material: 304 Stainless Steel | Size: NW/KF-25, 2 Pack
This blank flange cap provides a reliable seal for unused KF-25 connections, helping maintain vacuum integrity and system cleanliness. Its corrosion-resistant stainless steel body and smooth finish aid in hygienic, leak-free performance in lab and industrial settings. As a two-pack, it’s economical for multi-port manifolds or spare coverage.
AVCRAY Reducer KF-25 to KF-10
Brand: AVCRAY | Type: Vacuum Fitting | Material: 304 Stainless Steel | Sizes: KF-25 to KF-10
Used to transition between KF25 and KF10 connections, this reducer combines robust stainless steel construction with precise threading and sealing features. The conical design supports secure, leak-tight assemblies suitable for higher vacuum environments where smaller downstream components are introduced.
QiiMii KF-25 Tri Clamp Blank Stud
Brand: QiiMii | Type: Blank Stud/Cap | Material: 304 Stainless Steel | Flange: KF-25
Tri-clamp style blank studs provide quick-disconnect versatility and a clean termination for KF-25 lines. Stainless steel construction offers reliable corrosion resistance. These caps or studs are useful for foreline branches or standby ports in vacuum systems requiring rapid reconfiguration.
Elbow 90 Degrees KF-25 Vacuum Fittings
Brand: LAB OUTLET | Type: Elbow KF-25 | Material: Stainless Steel | Angle: 90 degrees
These 90-degree KF-25 elbows provide compact routing for vacuum lines in confined spaces. ISO-KF standards and stainless steel construction ensure durable, leak-resistant performance. They are compatible with UHV and high-vacuum applications when paired with proper gaskets and Viton seals if required for your system.
Buying Guide: Key Purchase Considerations
- Material and corrosion resistance: Stainless steel (304/316) is common for durability and chemical resistance in lab and industrial environments. Aluminum offers lightweight strength for less demanding setups.
- Flange standard and compatibility: Verify KF/NW sizes (e.g., KF-25, KF-16, KF-10) and ensure seamless integration with existing components and seals.
- Seal type and compatibility: Use appropriate gaskets, clamps, and centering rings to achieve leak-tight connections. O-rings and Viton seals may be required for high-vacuum applications.
- Connection type variety: From flange-to-flange, reducer, and hose barb adapters, select fittings that minimize the number of transitions and potential leak points.
- Ease of installation: Quick-connect options like tri-clamp adapters and mitered elbows can simplify assembly and maintenance in complex vacuum layouts.
- Pressure and temperature ratings: Consider the operating vacuum level and temperature conditions to avoid material deformation or seal failure.
- Availability and packaging: Practical sets (e.g., 2-pack flanges) provide readiness for future expansions or repairs.
When selecting NW vacuum fittings, it is helpful to map your system layout first, noting flange types, hose sizes, and required transitions. Prioritize components with proven sealing performance and compatible accessories (clamps, gaskets, centering rings) to maintain system integrity over time. The products above are representative options across common NW/KF configurations, balancing price, material quality, and compatibility for American laboratory and industrial users.