Distributor: Accu-Glass Products, Inc.
(661) 607-0250 Store Hours: Monday-Thursday 7:00am-4:30pm

CF Flanges

Larson Electronic Glass’s industry standard CF-type UHV flanges offer reliable sealing performance as result of the design geometry which “captures” the gasket material.

These CF flanges have a conical sealing edge that is pressed into the top and bottom surfaces of an OFHC copper gasket, a lateral cold flow of the gasket occurs. This cold flow is limited by the vertical flange wall. Further material flow is severely limited and high interface pressures are developed. These pressures cause gasket material to fill surface imperfections and produce a highly reliable seal. At high temperatures, the “capturing” geometry maintains high pressure despite of the gasket material softening.


  • Identical mating flanges - neither male nor female.
  • Mate with all other CF Conflat® flanges of the same size regardless of manufacturer
  • Easy repeated sealing
  • Leak tight even with minor nicks and scratches on gasket
  • Feedthroughs and other components can be welded or brazed to flanges
  • Available as blank, or bored to accept standard tube sizes
  • Copper gaskets, Viton® gaskets, and silver-plated bolt sets are offered

Request a quote on CF flanges for your UHV application, or contact Larson Electronic Glass for more information.

Larson Electronic Glass offers CF flanges available 1.33" diameter to 10" diameter in blank and various bore sizes.

ImageCF FlangesDiameter (A)Bolt circle (B)Thickness (C)Mating tube size (D)Height (E)PriceModel NumberPart NumberPrice
1.33" CF Flange Blank1.33"1.06".28"/.30"--17911101911101$17
2-3/4" CF Flange Blank2.73"2.312".500"--25911102911102$25
3-3/8" CF Flange Blank3.37"2.850".625"--56911103911103$56
4-1/2" CF Flange Blank4.47"3.628".680"--78911104911104$78
4-5/8" CF Flange Blank4.62"4.030".750"--85911105911105$85
6" CF Flange Blank5.97"5.128".780"--100911106911106$100
6-3/4" CF Flange Blank6.75"5.969".840--125911107911107$125
8" CF Flange Blank7.97"7.128".880"--180911108911108$180
10" CF Flange Blank9.97"9.128".970"--Contact Factory911110911110$0
1.33" CF Flange 3/4" Neck1.33"1.06".28"/.30"3/4".560"17911201911201$17
2-3/4" CF Flange Bored2.73"2.312".500"1-1/2"-25911202911202$25
3-3/8" CF Flange Bored3.37"2.850".625"2"-56911203911203$56
4-1/2" CF Flange Bored4.47"3.628".680"2-1/2"-78911204911204$78
4-5/8" CF Flange Bored4.62"4.030".750"3"-85911205911205$85
6" CF Flange Bored5.97"5.128".780"4"-100911206911206$100
6-3/4" CF Flange Bored6.75"5.969".8405"-125911207911207$125
8" CF Flange Bored7.97"7.128".880"6"-180911208911208$180
10" CF Flange Bored9.97"9.128".970"8"-Contact Factory911210911210$0
1.33" CF Flange 3/4" Bored1.33"1.06".28"/.30"3/4"-22911301911301$22