Vacuum Flanges and Fittings

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Finding the correct flange, fitting or other vacuum system hardware at the right time is essential for completing your industrial vacuum system design with minimal delay and effort.

PV V&E stocks an extensive inventory of over 2,500 stainless steel vacuum line fittings, flanges, and hardware to supply your project requirements. Find flanges and fittings to meet your specific requirements by searching our detailed product selection below, including:
  • Flanges and Fittings
  • Reducer Nipples
  • Elbows, Tees, and Crosses
  • Tubing and Weld Fittings
  • Adapters, Transitions, and more

Request a quote or buy online from our fully stocked and finished line of common vacuum hardware sizes and types designed to meet your project requirements. Contact us online, and we will work to meet your specific needs.

Vacuum Flanges and Fittings Features

  • Chain clamps and aluminum seals for converting NW and ISO flanges from high vacuum to UHV
  • Flange Types: ISO-KF (NW), ISO-K, ISO-F, CF (Conflat), ASA, Wire Seal, and EVAC

Bored and Blank Flanges

Our 304 and 316 stainless steel and aluminum blank flanges and bored weld rings are available in a range of styles, including ISO-KF (NW), ISO-K, ISO-F, CF (Conflat), ASA, EVAC, and WireSeal. Find the perfect fit for your HV or UHV custom vacuum system design or in discrete vacuum fittings.

  • Clamped and bolt-style connections
  • Clearance hole and tapped configurations
  • Imperial and metric threads

Full, Half, and Reducer Nipples

PV V&E offers welded and flanged end full nipples, half nipples, and reducer nipples for most vacuum systems and terminations, including ISO-KF (NW), ISO-K, CF (Conflat), and ASA.

  • 304 stainless steel construction
  • Common standard lengths
  • Straight and conical shapes
  • Custom configurations possible


Find flanged end 90 and 45-degree elbow configurations for ISO-KF (NW), ISO-K, CF (Conflat), and ASA terminations based on your vacuum system needs.

  • 304 stainless steel construction
  • Custom configurations possible 
  • Different length tangents, mitered, and radius shapes


Browse standard and reducer tees for any vacuum system, including flanged end terminations such as ISO-KF (NW), ISO-K, CF (Conflat), and ASA.

  • 304 stainless steel construction
  • Common standard lengths
  • Custom designs possible
  • Full-size or reducer tee configurations

Cross Fittings

PV V&E has 4-way, 5-way and 6-way vacuum crosses for building vacuum chambers, available with including ISO-KF (NW), ISO-K, CF (Conflat), and ASA flanged end terminations.

  • Alternate materials and custom designs are possible
  • Easy to install
  • Standard lengths and diameters

Flexible Hoses and Couplings

Dampen vibrations form quick and easy connections between misaligned points with PV V&E flexible hoses and couplings with ISO-KF (NW), ISO-K, CF (Conflat), and ASA flanged end terminations.

  • 321 stainless steel formed bellows construction
  • Custom designs possible
  • Many different hose and coupling lengths and diameters

Adapters & Transitions

Incorporate additional components and instrumentation into your vacuum system with aluminum-to-stainless and glass-to-Kovar, ISO-KF (NW), ISO-K, CF (Conflat), and ASA flanged end adapters and transitions.

  • Custom designs possible
  • Flange-to-fitting adapters with Swagelok, VCR, NPT, Quick Disconnect (QD), and Welch Pump connections
  • Flange-to-flange adapters with straight and conical tubes, tees, crosses, and zero-length double-sided flanges

Seals, Clamps, and Bolt Kits

Make vacuum-tight connections with Pfeiffer Vacuum Valves & Engineering’s complete range of clamps, bolt-kits, gaskets, seals, and centering rings designed to meet ISO standards. Intended for ISO-KF (NW), ISO-F, ISO-K, CF (Conflat), ASA, Wire Seal, and EVAC flange systems.

  • Aluminum and steel clamps and hardware
  • Elastomer seal rings in a range of materials, including FKM, FFKM, Silicon, Buna, and more
  • Metal UHV seals, including copper, silver-plated copper, and aluminum

Tubing & Weld Fittings

PV V&E stocks tubing and all types of elbows, tees, crosses, reducer nipples, end caps, flexible bellows hoses, and weld fittings to create custom manifolds, forelines, and long-run connections to pump and other facilities.


  • 304 stainless steel standard
  • 316L stainless steel optional

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