Ultra-Pure Standards

Jump To: Full List of CF Gasket Dimensions

Bostec Conflat Gaskets: Engineered for Ultra-Pure and SemiConductor Applications

Each Bostec CF gasket is laser cut and then machined on all sides to a fine finish with smooth edge transitions and no burrs. This ensures that the gas path around the ID of the gasket is fully swept and that entrapped or generated particles are minimized. The mating surfaces of each gasket are machined with a precise circular ring pattern, flat to 10RA, that helps the knife edge seat into the gasket for a perfect seal. Bostec CF gaskets conform to SEMI F19 and ASTM B46.1. Dimensional conformity is held to close tolerances and each gasket is temperature annealed in a special process that leaves the part with an ultra-bright appearance and in a dead-soft condition. Dead-soft gaskets are easier on your mating parts and help extend gland life. Our annealing process also strips the gasket of surface contaminants such as carbon, sulfur and other trace elements.


Bostec gaskets are produced from solid raw material and are not plated. For reactive gas conditions, we recommend solid nickel 200/201. Solid OFHC copper, aluminum 1100 and specialty alloys are also available.


Shipped in double plastic bags, Bostec Precision CF gaskets can go right from your inventory shelf to the production line with no secondary cleaning or inspection required.



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List of CF Gasket Dimensions
Download CF Dimensions

Call 424-212-7575 for additional sizes and alloys.

Available in: Pure Nickel, Ox-Free Copper, Aluminum 1100
Part Number OD ID Thickness EU P/N Metric OD Metric ID Thickness
English Metric
CF1.00 0.524 0.335 0.080 DN10 13.31 8.50 2.03
CF1.33 0.838 0.643 0.080 DN16 21.29 16.30 2.03
CF1.33/P2 0.838 0.640 0.075±001 - - - -
CF2.125 1.290 1.013 0.080 DN25 32.77 25.77 2.03
CF2.125/P1 1.290 1.010 0.075±001 - - - -
CF2.750 1.895 1.533 0.080 DN40 48.13 38.90 2.03
CF3.375 2.425 2.015 0.080 DN50 61.60 51.20 2.03
CF4.50 3.243 2.813 0.080 DN63\L 82.37 71.50 2.03
CF4.625 3.598 3.015 0.080 DN75 91.39 76.60 2.03
CF6.00 4.743 4.009 0.080 DN100 120.47 101.80 2.03
CF6.75 5.568 5.013 0.080 DN125 141.43 127.31 2.03
CF8.00 6.743 6.010 0.080 DN160 171.27 152.70 2.03
CF10.00 8.743 8.010 0.080 DN200 222.07 203.50 2.03
CF12.00 10.749 10.007 0.080 DN250 273.02 254.20 2.03
CF12.51 11.221 10.500 0.080 - 285.01 266.70 2.03
CF13.25 11.589 10.857 0.080 - 294.36 275.80 2.03
CF14 12.330 11.813 0.080 - 313.18 300.10 2.03
CF14.25 12.638 12.016 0.080 - 321.01 305.20 2.03
CF14.5 12.843 12.107 0.080 - 326.21 307.50 2.03
CF16.5 14.836 14.107 0.080 - 376.83 358.30 2.03
CF18 16.501 15.807 0.080 - 419.13 401.50 2.03
CF18.5 16.702 15.970 0.080 - 424.23 405.60 2.03

Download CF Dimensions
  Minimum purchase quantities may apply      Dimensions per ASTM E2734 / E2734M-10