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Parker CPI™/A-LOK® Instrumentation Tube Fittings are designed as leak-free connections for process, power and instrumentation applications. The CPI tube fittings utilize a single ferrule for easy make-up and excellent performance in vibration applications. The “spring loaded” effect of the single ferrule creates a constant tension between the fitting body and fitting nut. The A-LOK two ferrule compression tube fittings are designed to provide reliable leak-free connections for applications that specify a two ferrule system. These single and two ferrule fitting designs are manufactured to the highest quality standards and are available in a broad range of sizes, materials and configurations.

NOTE:
  • Dimensions for reference only, subject to change.
  • Add -Z6 for assembly of nuts and ferrules on the tube stub end.
  • Parts are supplied with nitrile o-rings as standard. For Fluorocarbon o-rings, add the suffix "-VO". Other o-rings available upon request.
    • Tube End to O-Ring Pipe Thread for fractional tube
    Unit of Measure
    1 

    Item #

    Connection Type

    Tube O.D.

    NPT Pipe Thread

    A

    K

    R

    X Dia.

    W HEX

    O-Ring Arp Uniform Dash No.

    4-2 T2HOF5 N/A Tube x NPT N/A 1/4 in N/A 1/8 N/A 1.33 in N/A .64 in N/A .41 in N/A .74 in N/A 3/4 in N/A 2-111
    4-4 T2HOF5 N/A Tube x NPT N/A 1/4 in N/A 1/4 N/A 1.54 in N/A .64 in N/A .51 in N/A .93 in N/A 15/16 in N/A 2-113
    4-6 T2HOF5 N/A Tube x NPT N/A 1/4 in N/A 3/8 N/A 1.60 in N/A .64 in N/A .54 in N/A 1.12 in N/A 1 1/8 in N/A 2-116
    5-2 T2HOF5 N/A Tube x NPT N/A 5/16 in N/A 1/8 N/A 1.36 in N/A .68 in N/A .41 in N/A .74 in N/A 3/4 in N/A 2-111
    5-4 T2HOF5 N/A Tube x NPT N/A 5/16 in N/A 1/4 N/A 1.58 in N/A .68 in N/A .51 in N/A .93 in N/A 15/16 in N/A 2-113
    6-2 T2HOF5 N/A Tube x NPT N/A 3/8 in N/A 1/8 N/A 1.42 in N/A .72 in N/A .41 in N/A .74 in N/A 3/4 in N/A 2-111
    6-4 T2HOF5 N/A Tube x NPT N/A 3/8 in N/A 1/4 N/A 1.62 in N/A .72 in N/A .72 in N/A .93 in N/A 15/16 in N/A 2-113
    6-6 T2HOF5 N/A Tube x NPT N/A 3/8 in N/A 3/8 N/A 1.68 in N/A .72 in N/A .54 in N/A 1.12 in N/A 1 1/8 in N/A 2-116
    8-6 T2HOF5 N/A Tube x NPT N/A 1/2 in N/A 3/8 N/A 1.94 in N/A .98 in N/A .54 in N/A 1.12 in N/A 1 1/8 in N/A 2-116
    10-8 T2HOF5 N/A Tube x NPT N/A 5/8 in N/A 1/2 N/A 2.15 in N/A 1.03 in N/A .66 in N/A 1.30 in N/A 1 3/8 in N/A 2-212
    12-12 T2HOF5 N/A Tube x NPT N/A 3/4 in N/A 3/4 N/A 2.27 in N/A 1.03 in N/A .76 in N/A 1.49 in N/A 1 1/2 in N/A 2-215
    16-16 T2HOF5 N/A Tube x NPT N/A 1 in N/A 1 N/A 2.65 in N/A 1.30 in N/A .85 in N/A 1.65 in N/A 1 3/4 in N/A 2-219
    1M3TU2 N/A Tube x NPT N/A 1/16 in N/A 1/8 N/A 1.03 in N/A .34 in N/A .41 in N/A .74 in N/A 3/4 in N/A 2-111
    4M3TU2 N/A Tube x NPT N/A 1/4 in N/A 1/8 N/A 1.31 in N/A .63 in N/A .41 in N/A .74 in N/A 3/4 in N/A 2-111
    4M3TU4 N/A Tube x NPT N/A 1/4 in N/A 1/4 N/A 1.52 in N/A .63 in N/A .51 in N/A .93 in N/A 15/16 in N/A 2-113
    4M3TU6 N/A Tube x NPT N/A 1/4 in N/A 3/8 N/A 1.50 in N/A .63 in N/A .54 in N/A 1.12 in N/A 1 1/8 in N/A 2-116
    6M3TU2 N/A Tube x NPT N/A 3/8 in N/A 1/8 N/A 1.38 in N/A .72 in N/A .41 in N/A .74 in N/A 3/4 in N/A 2-111
    6M3TU4 N/A Tube x NPT N/A 3/8 in N/A 1/4 N/A 1.58 in N/A .72 in N/A .72 in N/A .93 in N/A 15/16 in N/A 2-113
    6M3TU6 N/A Tube x NPT N/A 3/8 in N/A 3/8 N/A 1.65 in N/A .72 in N/A .54 in N/A 1.12 in N/A 1 1/8 in N/A 2-116
    8M3TU6 N/A Tube x NPT N/A 1/2 in N/A 3/8 N/A 1.78 in N/A .98 in N/A .54 in N/A 1.12 in N/A 1 1/8 in N/A 2-116
    12M3TU12 N/A Tube x NPT N/A 3/4 in N/A 3/4 N/A 2.16 in N/A 1.03 in N/A .76 in N/A 1.49 in N/A 1 1/2 in N/A 2-215
    16M3TU16 N/A Tube x NPT N/A 1 in N/A 1 N/A 2.56 in N/A 1.30 in N/A .85 in N/A 1.65 in N/A 1 3/4 in N/A 2-219
    Unit of Measure
    1