ISO-QF (KF) Socket Weld Flange


  • 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



  • Standard:
    • 304 Stainless Steel
    • 316 Stainless Steel


Product Notes

  • Internal weld
  • Self-aligning
  • Designed to fit standard inch tubing O.D.’s
  • QF63-QF200 uses LF Centering Rings

*Dimensions are in inches unless otherwise specified

Part IDReference NumberA B C D E Figure Material Tube Size 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID4001083Reference NumberQF100-400-SFA 4.02B 0.47C 0.25D 4.5E 3.875Figure 2Material 304 SSTTube Size 43D CADLoginDrawingLoginUnit Price$112.0025
Part ID4000082Reference NumberQF16-050-SFA 0.5B 0.56C 0.5D 0.42E 0.375Figure 1Material 304 SSTTube Size 0.53D CADLoginDrawingLoginUnit PriceRequest a QuoteContact
Part ID4001084Reference NumberQF160-600-SFA 6.02B 0.47C 0.25D 6.5E 5.875Figure 2Material 304 SSTTube Size 63D CADLoginDrawingLoginUnit Price$122.00Contact
Part ID4000083Reference NumberQF16-075-SFA 0.75B 0.56C 0.5D 0.67E 0.625Figure 1Material 304 SSTTube Size 0.753D CADLoginDrawingLoginUnit Price$10.00115
Part ID4001085Reference NumberQF200-800-SFA 8.02B 0.47C 0.25D 8.5E 7.76Figure 2Material 304 SSTTube Size 83D CADLoginDrawingLoginUnit Price$215.00Contact
Part ID4000084Reference NumberQF25-100-SFA 1.01B 0.5C 0.17D 1.13E 0.875Figure 2Material 304 SSTTube Size 13D CADLoginDrawingLoginUnit Price$11.50226
Part ID4000085Reference NumberQF40-150-SFA 1.51B 0.5C 0.21D 1.76E 1.375Figure 2Material 304 SSTTube Size 1.53D CADLoginDrawingLoginUnit Price$15.25129
Part ID4003085Reference NumberQF40-150-SF-316A 1.51B 0.5C 0.21D 1.76E Figure 2Material 316 SSTTube Size 1.53D CADLoginDrawingLoginUnit PriceRequest a Quote3
Part ID4000086Reference NumberQF50-200-SFA 2.01B 0.63C 0.23D 2.25E 1.875Figure 2Material 304 SSTTube Size 23D CADLoginDrawingLoginUnit Price$25.0063
Part ID4001081Reference NumberQF63-250-SFA 2.51B 0.47C 0.25D 3E 2.375Figure 2Material 304 SSTTube Size 2.53D CADLoginDrawingLoginUnit Price$74.00Contact
Part ID4001082Reference NumberQF80-300-SFA 3.01B 0.47C 0.25D 3.5E 2.875Figure 2Material 304 SSTTube Size 33D CADLoginDrawingLoginUnit Price$88.0029