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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.
  • Tube stub is pre-grooved as standard.
  • Add -Z6 for assembly of nuts and ferrules on the tube stub end.
    • NPT Male Adapter for metric tube
    Unit of Measure
    1 2 

    Item #

    Connection Type

    Tube O.D.

    NPT Pipe Thread

    A

    K

    R

    W HEX

    Bore

    M6MA3/8N N/A Tube to NPT N/A 6.0 mm N/A 3/8 N/A 36.5 mm N/A 16.1 mm N/A 14.5 mm N/A 18.0 mm N/A 3.0 mm
    M6MA1/2N N/A Tube to NPT N/A 6.0 mm N/A 1/2 N/A 42.1 mm N/A 16.1 mm N/A 19.2 mm N/A 22.0 mm N/A 3.0 mm
    M8MA1/4N N/A Tube to NPT N/A 8.0 mm N/A 1/4 N/A 37.3 mm N/A 16.7 mm N/A 14.5 mm N/A 14.0 mm N/A 6.4 mm
    M8MA3/8N N/A Tube to NPT N/A 8.0 mm N/A 3/8 N/A 38.1 mm N/A 16.7 mm N/A 14.5 mm N/A 12.0 mm N/A 6.4 mm
    M10MA1/4N N/A Tube to NPT N/A 10.0 mm N/A 1/4 N/A 38.1 mm N/A 17.5 mm N/A 14.5 mm N/A 14.0 mm N/A 7.1 mm
    M10MA3/8N N/A Tube to NPT N/A 10.0 mm N/A 3/8 N/A 43.7 mm N/A 17.5 mm N/A 14.5 mm N/A 18.0 mm N/A 7.5 mm
    M10MA1/2N N/A Tube to NPT N/A 10.0 mm N/A 1/2 N/A 44.5 mm N/A 17.5 mm N/A 19.2 mm N/A 22.0 mm N/A 7.5 mm
    M12MA1/4N N/A Tube to NPT N/A 12.0 mm N/A 1/4 N/A 43.7 mm N/A 23.0 mm N/A 14.5 mm N/A 14.0 mm N/A 7.1 mm
    M12MA3/8N N/A Tube to NPT N/A 12.0 mm N/A 3/8 N/A 44.5 mm N/A 23.0 mm N/A 14.5 mm N/A 27.0 mm N/A 9.1 mm
    M12MA1/2N N/A Tube to NPT N/A 12.0 mm N/A 1/2 N/A 49.2 mm N/A 23.0 mm N/A 19.2 mm N/A 22.0 mm N/A 9.1 mm
    M16MA1/2N N/A Tube to NPT N/A 16.0 mm N/A 1/2 N/A 50.8 mm N/A 24.6 mm N/A 19.2 mm N/A 22.0 mm N/A 12.7 mm
    M16MA3/4N N/A Tube to NPT N/A 16.0 mm N/A 3/4 N/A 51.6 mm N/A 24.6 mm N/A 19.2 mm N/A 27.0 mm N/A 12.7 mm
    M18MA1/2N N/A Tube to NPT N/A 18.0 mm N/A 1/2 N/A 50.8 mm N/A 24.6 mm N/A 19.2 mm N/A 22.0 mm N/A 12.7 mm
    M18MA3/4N N/A Tube to NPT N/A 18.0 mm N/A 3/4 N/A 51.6 mm N/A 24.6 mm N/A 19.2 mm N/A 27.0 mm N/A 14.0 mm
    M20MA1/2N N/A Tube to NPT N/A 20.0 mm N/A 1/2 N/A 51.8 mm N/A 25.6 mm N/A 19.2 mm N/A 22.0 mm N/A 15.0 mm
    M20MA3/4N N/A Tube to NPT N/A 20.0 mm N/A 3/4 N/A 52.4 mm N/A 25.4 mm N/A 19.2 mm N/A 27.0 mm N/A 15.1 mm
    M25MA1N N/A Tube to NPT N/A 25.0 mm N/A 1 N/A 65.9 mm N/A 31.8 mm N/A 24.0 mm N/A 35.0 mm N/A 19.8 mm
    Unit of Measure
    1 2