ISO-LF To ISO-QF (KF) Reducer Cross

Crosses accommodate junctions or alignment considerations for a vacuum system design. Crosses are also used as junction adapters between different tubing sizes or flange types.


  • High Vacuum Rated to 1×10-8 Torr
  • Bakeable to 200oC
  • Quick sealing and disassembly


  • Standard: 304 Stainless Steel
  • Alternative: 6061 Aluminum (Contact us for price and delivery)

Product Notes

  • Pulled ports for optimal vacuum performance
  • Reducing intersection for different ISO-LF flange sizes

Options (Contact us for price and delivery)

  • Custom lengths
  • Custom flange combinations
  • ISO-QF large size flanges
  • ISO-LFB flanges
  • Tapped bolt holes

*Dimensions are in inches unless otherwise specified

Part IDReference NumberA B Flange 3 Tube O.D. Flange 1 & 2 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID4500435Reference NumberLF63xQF40-250×150-R4X-3.25X2.92A 3.25B 2.92Flange 3 QF40Tube O.D. 1.5Flange 1 & 2 LF633D CADLoginDrawingLoginUnit Price$289.00Contact
Part ID4500436Reference NumberLF63XQF50-250X200-R4X-3.25X3.40A 3.25B 3.4Flange 3 QF50Tube O.D. 2Flange 1 & 2 LF633D CADLoginDrawingLoginUnit Price$335.75Contact
Part ID4500437Reference NumberLF80XQF40-300X150-R4X-3.50X3.17A 3.5B 3.17Flange 3 QF40Tube O.D. 1.5Flange 1 & 2 LF803D CADLoginDrawingLoginUnit Price$369.75Contact
Part ID4500438Reference NumberLF80XQF50-300X200-R4X-3.50X3.65A 3.5B 3.65Flange 3 QF50Tube O.D. 2Flange 1 & 2 LF803D CADLoginDrawingLoginUnit Price$416.50Contact
Part ID4500439Reference NumberLF100XQF40-400X150-R4X-4.13X3.65A 4.13B 3.65Flange 3 QF40Tube O.D. 1.5Flange 1 & 2 LF1003D CADLoginDrawingLoginUnit Price$420.75Contact
Part ID4500369Reference NumberLF100XQF50-400X200-R4X-4.13X4.17A 4.13B 4.17Flange 3 QF50Tube O.D. 2Flange 1 & 2 LF1003D CADLoginDrawingLoginUnit Price$467.50Contact