ISO-QF (KF) Unbored Stub Flange

Unbored Stub Flanges are manufactured with no weld prep and no tubing bore. They are commonly altered by customers with their own custom machining capability for a special use.



  • High Vacuum Rated to 1×10-8 Torr
  • Bakeable to 200°C
  • Compatible with all ISO standard vacuum flanges and fittings
  • Quick sealing and disassembly
  • Designed to fit standard inch tubing O.D.’s



  • Standard:
    • 304 Stainless Steel
    • 6061 Aluminum


Product Notes

  • Good choice for custom modification

*Dimensions are in inches unless otherwise specified

Part IDReference NumberA B Material 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID4000175Reference NumberQF16-000-USA 0.75B 0.75Material 304 SST3D CADLoginDrawingLoginUnit Price$15.502
Part ID4000180Reference NumberQF16-000-US-ALA 0.75B 0.75Material 6061-T6 Aluminum3D CADLoginDrawingLoginUnit Price$10.5055
Part ID4000176Reference NumberQF25-000-USA 1B 0.75Material 304 SST3D CADLoginDrawingLoginUnit Price$14.25Contact
Part ID4000181Reference NumberQF25-000-US-ALA 1B 0.75Material 6061-T6 Aluminum3D CADLoginDrawingLoginUnit Price$12.254
Part ID4000177Reference NumberQF40-000-USA 1.5B 1Material 304 SST3D CADLoginDrawingLoginUnit Price$20.5037
Part ID4000182Reference NumberQF40-000-US-ALA 1.5B 1Material 6061-T6 Aluminum3D CADLoginDrawingLoginUnit Price$17.0049
Part ID4000178Reference NumberQF50-000-USA 2B 1Material 304 SST3D CADLoginDrawingLoginUnit Price$33.00Contact
Part ID4000183Reference NumberQF50-000-US-ALA 2B 1Material 6061-T6 Aluminum3D CADLoginDrawingLoginUnit Price$24.25Contact