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

Tees accomodate junctions or alignment considerations for vacuum system design. They are also used as junction adapters between different tubing sizes or flange types.



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



  • Standard: 304 Stainless Steel
  • Alternative: 6061 Aluminum


Product Notes

  • Pulled ports for optimal vacuum performance
  • Reducing intersection for ISO-LF to ISO-QF 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 ID4500423Reference NumberLF63xQF40-250×150-RDT-3.25X2.90A 2.9B 3.25Flange 3 QF40Tube O.D. 1.5Flange 1 & 2 LF633D CADLoginDrawingLoginUnit Price$220.00Contact
Part ID4500424Reference NumberLF63XQF50-250X200-RDT-3.25X3.40A 3.4B 3.25Flange 3 QF50Tube O.D. 2Flange 1 & 2 LF633D CADLoginDrawingLoginUnit Price$230.00Contact
Part ID4500425Reference NumberLF80XQF40-300X150-RDT-3.50X3.17A 3.15B 3.5Flange 3 QF40Tube O.D. 1.5Flange 1 & 2 LF803D CADLoginDrawingLoginUnit Price$255.00Contact
Part ID4500426Reference NumberLF80XQF50-300X200-RDT-3.50X3.67A 3.67B 3.5Flange 3 QF50Tube O.D. 2Flange 1 & 2 LF803D CADLoginDrawingLoginUnit Price$270.00Contact
Part ID4500427Reference NumberLF100XQF40-400X150-RDT-4.13X3.67A 3.65B 4.13Flange 3 QF40Tube O.D. 1.5Flange 1 & 2 LF1003D CADLoginDrawingLoginUnit Price$280.00Contact
Part ID4500351Reference NumberLF100XQF50-400X200-RDT-4.13X4.17A 4.125B 4.17Flange 3 QF50Tube O.D. 2Flange 1 & 2 LF1003D CADLoginDrawingLoginUnit Price$270.00Contact