ISO-LF 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
    • 6061 Aluminum


Product Notes

  • Internal weld
  • Self-aligning
  • Designed to fit standard inch tubing O.D.’s
  • To simplify aluminum welding, ANCORP also offers an aluminum ISO-LF stub weld flange

*Dimensions are in inches unless otherwise specified

Part IDReference NumberA B C D Material Tube O.D. 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID4500069Reference NumberLF63-250-SFA 2.51B 2.37C 3.74D 0.25Material 304 SSTTube O.D. 2.53D CADLoginDrawingLoginUnit Price$62.00138
Part ID4503069Reference NumberLF63-250-SF-316A 2.51B 2.37C 3.74D 0.25Material 316 SSTTube O.D. 2.53D CADLoginDrawingLoginUnit PriceRequest a Quote19
Part ID4500078Reference NumberLF63-250-SF-ALA 2.51B 2.37C 3.74D 0.25Material 6061-T6 AluminumTube O.D. 2.53D CADLoginDrawingLoginUnit Price$47.50Contact
Part ID4500070Reference NumberLF80-300-SFA 3.01B 2.87C 4.33D 0.25Material 304 SSTTube O.D. 33D CADLoginDrawingLoginUnit Price$73.50262
Part ID4506070Reference NumberLF80-300-SF-316A 3.01B 2.87C 4.33D 0.25Material 316 SSTTube O.D. 33D CADLoginDrawingLoginUnit PriceRequest a Quote4
Part ID4500079Reference NumberLF80-300-SF-ALA 3.01B 2.87C 4.33D 0.25Material 6061-T6 AluminumTube O.D. 33D CADLoginDrawingLoginUnit Price$60.0012
Part ID4500071Reference NumberLF100-400-SFA 4.01B 3.87C 5.12D 0.25Material 304 SSTTube O.D. 43D CADLoginDrawingLoginUnit Price$85.00185
Part ID4506071Reference NumberLF100-400-SF-316A 4.01B 3.87C 5.12D 0.25Material 316 SSTTube O.D. 43D CADLoginDrawingLoginUnit PriceRequest a Quote3
Part ID4500080Reference NumberLF100-400-SF-ALA 4.02B 3.87C 5.12D 0.25Material 6061-T6 AluminumTube O.D. 43D CADLoginDrawingLoginUnit Price$66.00Contact
Part ID4500072Reference NumberLF160-600-SFA 6.02B 5.83C 7.09D 0.25Material 304 SSTTube O.D. 63D CADLoginDrawingLoginUnit Price$118.5053
Part ID4500081Reference NumberLF160-600-SF-ALA 6.02B 5.83C 7.09D 0.25Material 6061-T6 AluminumTube O.D. 63D CADLoginDrawingLoginUnit Price$110.00Contact
Part ID4500073Reference NumberLF200-800-SFA 8.02B 7.76C 9.45D 0.25Material 304 SSTTube O.D. 83D CADLoginDrawingLoginUnit Price$185.0044
Part ID4500082Reference NumberLF200-800-SF-ALA 8.02B 7.76C 9.45D 0.25Material 6061-T6 AluminumTube O.D. 83D CADLoginDrawingLoginUnit Price$165.005
Part ID4500074Reference NumberLF250-1000-SFA 10.02B 9.75C 11.42D 0.25Material 304 SSTTube O.D. 103D CADLoginDrawingLoginUnit Price$295.0027
Part ID4500083Reference NumberLF250-1000-SF-ALA 10.03B 9.76C 11.42D 0.25Material 6061-T6 AluminumTube O.D. 103D CADLoginDrawingLoginUnit Price$192.501
Part ID4500181Reference NumberLF320-1200-SFA 12.03B 11.88C 14.57D 0.38Material 304 SSTTube O.D. 123D CADLoginDrawingLoginUnit PriceRequest a QuoteContact
Part ID4500186Reference NumberLF320-1200-SF-ALA 12.03B 11.88C 14.57D 0.38Material 6061-T6 AluminumTube O.D. 123D CADLoginDrawingLoginUnit PriceRequest a QuoteContact
Part ID4500075Reference NumberLF320-1275-SFA 12.77B 12.42C 14.57D 0.38Material 304 SSTTube O.D. 12.753D CADLoginDrawingLoginUnit Price$570.004
Part ID4500084Reference NumberLF320-1275-SF-ALA 12.77B 12.42C 14.57D 0.38Material 6061-T6 AluminumTube O.D. 12.753D CADLoginDrawingLoginUnit PriceRequest a Quote7
Part ID4500076Reference NumberLF400-1600-SFA 16.03B 15.62C 17.72D 0.38Material 304 SSTTube O.D. 163D CADLoginDrawingLoginUnit PriceRequest a QuoteContact
Part ID4500085Reference NumberLF400-1600-SF-ALA 16.03B 15.62C 17.72D 0.38Material 6061-T6 AluminumTube O.D. 163D CADLoginDrawingLoginUnit PriceRequest a QuoteContact
Part ID4500077Reference NumberLF500-2000-SFA 20.04B 19.62C 21.65D 0.38Material 304 SSTTube O.D. 203D CADLoginDrawingLoginUnit PriceRequest a QuoteContact
Part ID4500086Reference NumberLF500-2000-SF-ALA 20.03B 19.62C 21.65D 0.38Material 6061-T6 AluminumTube O.D. 203D CADLoginDrawingLoginUnit PriceRequest a QuoteContact