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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.
  • A, C1 and C2 dimensions are typical finger-tight.
    • Reducing Union for fractional tube
    Unit of Measure
    1 2 

    Item #

    Connection Type

    T1 Tube O.D.

    T2 Tube O.D.

    A

    C1

    C2

    W HEX

    2-1 HBZ N/A CPI™ to CPI™ N/A 1/8 in N/A 1/16 in N/A 1.21 in N/A .60 in N/A .43 in N/A 7/16 in
    3-1 HBZ N/A CPI™ to CPI™ N/A 3/16 in N/A 1/16 in N/A 1.27 in N/A .64 in N/A .43 in N/A 7/16 in
    3-2 HBZ N/A CPI™ to CPI™ N/A 3/16 in N/A 1/8 in N/A 1.44 in N/A .64 in N/A .60 in N/A 7/16 in
    4-1 HBZ N/A CPI™ to CPI™ N/A 1/4 in N/A 1/16 in N/A 1.38 in N/A .70 in N/A .43 in N/A 1/2 in
    4-2 HBZ N/A CPI™ to CPI™ N/A 1/4 in N/A 1/8 in N/A 1.52 in N/A .70 in N/A .60 in N/A 1/2 in
    4-3 HBZ N/A CPI™ to CPI™ N/A 1/4 in N/A 3/16 in N/A 1.55 in N/A .70 in N/A .64 in N/A 1/2 in
    5-2 HBZ N/A CPI™ to CPI™ N/A 5/16 in N/A 1/8 in N/A 1.58 in N/A .73 in N/A .60 in N/A 9/16 in
    5-4 HBZ N/A CPI™ to CPI™ N/A 5/16 in N/A 1/4 in N/A 1.67 in N/A .73 in N/A .70 in N/A 9/16 in
    6-1 HBZ N/A CPI™ to CPI™ N/A 3/8 in N/A 1/16 in N/A 1.44 in N/A .76 in N/A .43 in N/A 5/8 in
    6-2 HBZ N/A CPI™ to CPI™ N/A 3/8 in N/A 1/8 in N/A 1.61 in N/A .76 in N/A .60 in N/A 5/8 in
    6-4 HBZ N/A CPI™ to CPI™ N/A 3/8 in N/A 1/4 in N/A 1.71 in N/A .76 in N/A .70 in N/A 5/8 in
    6-5 HBZ N/A CPI™ to CPI™ N/A 3/8 in N/A 5/16 in N/A 1.75 in N/A .76 in N/A .73 in N/A 5/8 in
    8-2 HBZ N/A CPI™ to CPI™ N/A 1/2 in N/A 1/8 in N/A 1.75 in N/A .87 in N/A .60 in N/A 13/16 in
    8-4 HBZ N/A CPI™ to CPI™ N/A 1/2 in N/A 1/4 in N/A 1.85 in N/A .87 in N/A .70 in N/A 13/16 in
    8-6 HBZ N/A CPI™ to CPI™ N/A 1/2 in N/A 3/8 in N/A 1.91 in N/A .87 in N/A .76 in N/A 13/16 in
    10-6 HBZ N/A CPI™ to CPI™ N/A 5/8 in N/A 3/8 in N/A 1.94 in N/A .87 in N/A .76 in N/A 15/16 in
    10-8 HBZ N/A CPI™ to CPI™ N/A 5/8 in N/A 1/2 in N/A 2.05 in N/A .87 in N/A .87 in N/A 15/16 in
    12-4 HBZ N/A CPI™ to CPI™ N/A 3/4 in N/A 1/4 in N/A 1.95 in N/A .87 in N/A .70 in N/A 1 1/16 in
    12-6 HBZ N/A CPI™ to CPI™ N/A 3/4 in N/A 3/8 in N/A 2.00 in N/A .87 in N/A .76 in N/A 1 1/16 in
    12-8 HBZ N/A CPI™ to CPI™ N/A 3/4 in N/A 1/2 in N/A 2.11 in N/A .87 in N/A .87 in N/A 1 1/16 in
    12-10 HBZ N/A CPI™ to CPI™ N/A 3/4 in N/A 5/8 in N/A 2.11 in N/A .87 in N/A .87 in N/A 1 1/16 in
    16-8 HBZ N/A CPI™ to CPI™ N/A 1 in N/A 1/2 in N/A 2.39 in N/A 1.05 in N/A .87 in N/A 1 3/8 in
    16-12 HBZ N/A CPI™ to CPI™ N/A 1 in N/A 3/4 in N/A 2.39 in N/A 1.05 in N/A .87 in N/A 1 3/8 in
    2RU1 N/A A-LOK® to A-LOK® N/A 1/8 in N/A 1/16 in N/A 1.21 in N/A .60 in N/A .43 in N/A 7/16 in
    3RU1 N/A A-LOK® to A-LOK® N/A 3/16 in N/A 1/16 in N/A 1.27 in N/A .64 in N/A .43 in N/A 7/16 in
    Unit of Measure
    1 2