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    2. ASTM A453 Grade 660 Class D
    3. API 6A Full Thread Stud Bolt

    ASTM A453 Grade 660 Class D API 6A Full Thread Stud Bolt

    For products monogrammed per API 6A 21st Edition, all closure bolting shall be qualified and manufactured in accordance with API 20F (Corrosion-Resistant Bolting Requirements).

    API 6A Full Thread Stud Bolt Length for 6B Flange Connectors with "R" & "RX" Gaskets

    API 6A Full Thread Stud Bolt Length for 6B Flange Connectors with R & RX Gaskets
    Flange Size and Pressure Bolt Size and Thread Length* Flange Size and Pressure Bolt Size and Thread Length*
    2 1/16 2000 5/8 - 11 UNC 5.000 7 1/16 2000 1 - 8 UNC 7.500
    2 1/16 3000 7/8 - 9 UNC 6.500 7 1/16 3000 1 1/8 - 8 UN 8.500
    2 1/16 5000 7/8 - 9 UNC 6.500 7 1/16 5000 1 3/8 - 8 UN 11.250
    2 9/16 2000 3/4 - 10 UNC 5.500 9 2000 1 1/8 - 8 UN 8.500
    2 9/16 3000 1 - 8 UNC 7.000 9 3000 1 3/8 - 8 UN 9.500
    2 9/16 5000 1 - 8 UNC 7.000 9 5000 1 5/8 - 8 UN 12.500
    3 1/8 2000 3/4 - 10 UNC 5.750 11 2000 1 1/4 - 8 UN 9.250
    3 1/8 3000 7/8 - 9 UNC 6.500 11 3000 1 3/8 - 8 UN 10.000
    3 1/8 5000 1 1/8 - 8 UN 7.750 11 5000 1 7/8 - 8 UN 14.250
    4 1/16 2000 7/8 - 9 UNC 6.500 13 5/8 2000 1 1/4 - 8 UN 9.500
    4 1/16 3000 1 1/8 - 8 UN 7.500 13 5/8 3000 1 3/8 - 8 UN 10.750
    4 1/16 5000 1 1/4 - 8 UN 8.500 16 3/4 2000 1 1/2 - 8 UN 10.750
    5 1/8 2000 1 - 8 UNC 7.250 16 3/4 3000 1 5/8 - 8 UN 12.250
    5 1/8 3000 1 1/4 - 8 UN 8.250 21 1/4 2000 1 5/8 - 8 UN 12.250
    5 1/8 5000 1 1/2 - 8 UN 10.500 20 3/4 3000 2-8 UN 15.000
      FOOTNOTES* Tolerance on bolt length: +0.1 25/−0 in. for lengths up to 1 2 in. +0.250/ − 0 in. for lengths over 1 2 in.

    API 6A Full Thread Stud Bolt Length for 6BX Flange Connectors

    API 6A Full Thread Stud Bolt Length for 6BX Flange Connectors
    Flange Size and Pressure Bolt Size and Thread Length * Flange Size and Pressure Bolt Size and Thread Length *
    1 4/5 10,000 3/4 - 10 UNC 5.500 11 10,000 1 3/4 - 8 UN 15.250
    1 4/5 15,000 7/8 - 9 UNC 6.000 11 15,000 2-8 UN 19.500
    1 4/5 20,000 1 - 8 UNC 7.750 11 20,000 2 3/4 - 8 UN 23.750
    2 1/16 10,000 3/4 - 10 UNC 5.500 13 5/8 5000 1 5/8 - 8 UN 12.750
    2 1/16 15,000 7/8 - 9 UNC 6.500 13 5/8 10,000 1 7/8 - 8 UN 17.750
    2 1/16 20,000 1 1/8 - 8 UN 8.500 13 5/8 15,000 2 1/4 - 8 UN 21.250
    2 9/16 10,000 7/8 - 9 UNC 6.500 13 5/8 20,000 3-8 UN 29.750
    2 9/16 15,000 1 - 8 UN 7.250 16 3/4 5000 1 7/8 - 8 UN 14.750
    2 9/16 20,000 1 1/4 - 8 UN 9.500 16 3/4 10,000 1 7/8 - 8 UN 17.750
    3 1/16 10,000 1 - 8 UNC 7.250 18 3/4 5000 2-8 UN 17.750
    3 1/16 15,000 1 1/8 - 8 UN 8.000 18 3/4 10,000 2 1/4 - 8 UN 22.750
    3 1/16 20,000 1 3/8 - 8 UN 10.250 18 3/4 15,000 3-8 UN 26.750
    4 1/16 10,000 1 1/8 - 8 UN 8.500 21 1/4 5000 2-8 UN 19.000
    4 1/16 15,000 1 3/8 - 8 UN 9.750 21 1/4 10,000 2 1/2 - 8 UN 24.750
    4 1/16 20,000 1 3/4 - 8UN 12.500 26 3/4 2000 1 3/4 - 8 UN 14.250
    5 1/8 10,000 1 1/8 - 8 UN 9.250 26 3/4 3000 2-8 UN 17.500
    5 1/8 15,000 1 1/2 - 8 UN 11.500 30 2000 1 5/8 - 8 UN 14.500
    7 1/16 10,000 1 1/2 - 8 UN 11.750 30 3000 1 7/8 - 8 UN 17.750
    7 1/16 15,000 1 1/2 - 8 UN 13.000 - - - -
    7 1/16 20,000 2-8 UN 17.750 - - - -
    9 10,000 1 1/2 - 8 UN 13.500 - - - -
    9 15,000 1 7/8 - 8 UN 16.000 - - - -
    9 20,000 2 1/2 - 8UN 21.750 - - - -
    • FOOTNOTES* Tolerance on tap end thread length: +0.063/ − 0 in.** Tolerance on tap end stud length: +0.1 25/− 0 in.

    API 6A Full Thread Stud Bolt Length for 6B Flange Connectors with "R" Gaskets UNSC Series

    API 6A Full Thread Stud Bolt Length for 6B Flange Connectors with R Gaskets UNSC Series
    Flange Size and Pressure Bolt Size and Thread Length* Flange Size and Pressure Bolt Size and Thread Length*
    2 1/16 2000 5/8 - 11 UNC 4.750 7 1/16 2000 1 - 8 UNC 7.250
    2 1/16 3000 7/8 - 9 UNC 6.250 7 1/16 3000 1 1/8 - 8 UN 8.250
    2 1/16 5000 7/8 - 9 UNC 6.250 7 1/16 5000 1 3/8 - 8 UN 11.000
    2 9/16 2000 3/4 - 10 UNC 5.250 9 2000 1 1/8 - 8 UN 8.250
    2 9/16 3000 1 - 8 UNC 6.750 9 3000 1 3/8 - 8 UN 9.250
    2 9/16 5000 1 - 8 UNC 6.750 9 5000 1 5/8 - 8 UN 12.250
    3 1/8 2000 3/4 - 10 UNC 5.500 11 2000 1 1/4 - 8 UN 9.000
    3 1/8 3000 7/8 - 9 UNC 6.250 11 3000 1 3/8 - 8 UN 9.750
    3 1/8 5000 1 1/8 - 8 UN 7.500 11 5000 1 7/8 - 8 UN 14.000
    4 1/16 2000 7/8 - 9 UNC 6.250 13 5/8 2000 1 1/4 - 8 UN 9.250
    4 1/16 3000 1 1/8 - 8 UN 7.250 13 5/8 3000 1 3/8 - 8 UN 10.500
    4 1/16 5000 1 1/4 - 8 UN 8.250 16 3/4 2000 1 1/2 - 8 UN 10.500
    5 1/8 2000 1 - 8 UNC 7.000 16 3/4 3000 1 5/8 - 8 UN 12.000
    5 1/8 3000 1 1/4 - 8 UN 8.000 21 1/4 2000 1 5/8 - 8 UN 11.750
    5 1/8 5000 1 1/2 - 8 UN 10.250 20 3/4 3000 2-8 UN 14.500
    • FOOTNOTES* Tolerance on bolt length:+0.1 25, −0 in. for lengths up to 1 2 in. +0.250, −0 in. for lengths over 1 2 in.
    Specifications
    • ASTM A453
    • ASTM A638
    • EN 10269
    • EN 10083-3
    • ISO 3506-5
    • DIN 267
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