ISO-LFB Socket Weld Flange


  • High Vacuum Rated to 1×10-8 Torr
  • Bakeable to 200°C
  • Compatible with all ISO standard vacuum flanges and fittings
  • Clearance holes (through-hole) 



  • Standard: 304 stainless steel
  • Alternative: Aluminum (Contact us for price and delivery)


Product Notes

  • Internal weld
  • Self-aligning
  • Designed to fit standard inch tubing O.D.’s


Options (Contact us for price and delivery)

  • Tapped bolt holes

*Dimensions are in inches unless otherwise specified

Part IDReference NumberA B C Tube O.D. 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID4500137Reference NumberLFB100-400-SFA 3.87B 4.01C 0.25Tube O.D. 43D CADLoginDrawingLoginUnit Price$165.00Contact
Part ID4500138Reference NumberLFB160-600-SFA 5.83B 6.02C 0.25Tube O.D. 63D CADLoginDrawingLoginUnit Price$185.001
Part ID4500139Reference NumberLFB200-800-SFA 7.76B 8.02C 0.25Tube O.D. 83D CADLoginDrawingLoginUnit Price$260.002
Part ID4500140Reference NumberLFB250-1000-SFA 9.75B 10.02C 0.25Tube O.D. 103D CADLoginDrawingLoginUnit Price$365.004
Part ID4500183Reference NumberLFB320-1200-SFA 12.42B 12.77C 0.38Tube O.D. 123D CADLoginDrawingLoginUnit PriceRequest a Quote2
Part ID4500141Reference NumberLFB320-1275-SFA 12.42B 12.77C 0.38Tube O.D. 12.753D CADLoginDrawingLoginUnit Price$850.002
Part ID4500142Reference NumberLFB400-1600-SFA 15.62B 16.02C 0.38Tube O.D. 163D CADLoginDrawingLoginUnit PriceRequest a QuoteContact
Part ID4500143Reference NumberLFB500-2000-SFA 19.62B 20.02C 0.38Tube O.D. 203D CADLoginDrawingLoginUnit PriceRequest a QuoteContact
Part ID4500135Reference NumberLFB63-250-SFA 2.37B 2.51C 0.25Tube O.D. 2.53D CADLoginDrawingLoginUnit Price$82.5025
Part ID4500136Reference NumberLFB80-300-SFA 2.87B 3.01C 0.25Tube O.D. 33D CADLoginDrawingLoginUnit Price$110.00Contact