• fangfangfang2 posted an update 5 days, 2 hours ago

    Drill stem subs is a necessary part in oil,natural gas,coal drilling.It is an important component in drill column.It plays the function of connection and transition in drilling tools of different specifications.The company can manufacture different kinds of Drill-stem subs with different specification and lengths that connect with drill collars,drill pipes,kellies,and swivel.Also can provide polished blanks of joints.Surface of screw is copper-plated or phosphated.Good adhension-prevention.
    Specification of drill stem subs for drill pipe (table1)
    Drill pipe nominal sizeOutside Diameter
    D U (in)Bevel diameter
    D F
    60.3(2 3/8″)85.7(3 3/8″)83.0(3 9/32″)
    73.0(2 7/8″)104.8(4 1/8″)100.4(3 15/16″)
    111.1(4 3/8″)
    88.9(3 1/2″)120.7(4 3/8″)116.3(4 9/32″)
    127(5″)
    101.6(4″)152.4(6″)145.0(5 11/16″)
    114.3(4 1/2″)168.3(6 5/8″)154.0(6 1/16″)
    127(5″)168.3(6 5/8″)154.0(6 1/16″)
    139.7(5 1/2″)177.8(7″)170.7(6 23/32″)
    184.2(7 1/4″)
    Specification of drill stem subs for drill collars(table2)
    Drill collar nominal sizeBevel diameter
    D F
    79.4(3 1/8″)76.2(3″)
    88.9(3 1/2″)82.9(3 1/4″)
    104.8(4 1/8″)100.4(3 15/16″)
    120.7(4 3/4″)114.7(4 1/2″)
    203.2(8″)190.1(7 1/2″)
    209.6(8 1/4″)195.7(7 23/32″)
    228.6(9″)212.7(8 3/8″)
    241.3(9 1/2″)223.8(8 13/16″)
    A-and B-type drill stem subs length (table3)
    Drill stem subs typelength(I)length(II)
    basic dimensions ultimate deviationbasic dimensions ultimate deviation
    A915 ±15610 ±10
    B1220 ±20610 ±10Joint Made in China
    website:http://www.chinateda.com/joint/