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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.
    • BSP Taper Male Adapter for fractional tube
    Unit of Measure
    1 2 

    Item #

    Connection Type

    Tube O.D.

    BSPP Thread

    A

    K

    R

    W HEX

    Bore

    2-2K T2HFK N/A Tube to BSPT N/A 1/8 in N/A 1/8 N/A 1.16 in N/A .54 in N/A .38 in N/A 7/16 in N/A .07 in
    2-4K T2HFK N/A Tube to BSPT N/A 1/8 in N/A 1/4 N/A 1.39 in N/A .54 in N/A .56 in N/A 9/16 in N/A .07 in
    4-2K T2HFK N/A Tube to BSPT N/A 1/4 in N/A 1/8 N/A 1.25 in N/A .63 in N/A .38 in N/A 7/16 in N/A .16 in
    4-4K T2HFK N/A Tube to BSPT N/A 1/4 in N/A 1/4 N/A 1.46 in N/A .63 in N/A .56 in N/A 9/16 in N/A .16 in
    4-6K T2HFK N/A Tube to BSPT N/A 1/4 in N/A 3/8 N/A 1.44 in N/A .63 in N/A .56 in N/A 11/16 in N/A .16 in
    4-8K T2HFK N/A Tube to BSPT N/A 1/4 in N/A 1/2 N/A 1.66 in N/A .66 in N/A .75 in N/A 7/8 in N/A .22 in
    5-2 T2HFK N/A Tube to BSPT N/A 5/16 in N/A 1/8 N/A 1.29 in N/A .66 in N/A .38 in N/A 7/16 in N/A .22 in
    5-4 T2HFK N/A Tube to BSPT N/A 5/16 in N/A 1/4 N/A 1.50 in N/A .66 in N/A .56 in N/A 9/16 in N/A .22 in
    6-4 T2HFK N/A Tube to BSPT N/A 3/8 in N/A 1/4 N/A 1.50 in N/A .69 in N/A .56 in N/A 9/16 in N/A .28 in
    6-6 T2HFK N/A Tube to BSPT N/A 3/8 in N/A 3/8 N/A 1.50 in N/A .69 in N/A .56 in N/A 11/16 in N/A .28 in
    6-8 T2HFK N/A Tube to BSPT N/A 3/8 in N/A 1/2 N/A 1.72 in N/A .69 in N/A .75 in N/A 7/8 in N/A .28 in
    8-4 T2HFK N/A Tube to BSPT N/A 1/2 in N/A 1/4 N/A 1.72 in N/A .91 in N/A .56 in N/A 9/16 in N/A .38 in
    8-6 T2HFK N/A Tube to BSPT N/A 1/2 in N/A 3/8 N/A 1.75 in N/A .91 in N/A .56 in N/A 11/16 in N/A .38 in
    8-8 T2HFK N/A Tube to BSPT N/A 1/2 in N/A 1/2 N/A 1.94 in N/A .91 in N/A .75 in N/A 7/8 in N/A .38 in
    10-6 T2HFK N/A Tube to BSPT N/A 5/8 in N/A 3/8 N/A 1.91 in N/A .97 in N/A .56 in N/A 11/16 in N/A .47 in
    10-8 T2HFK N/A Tube to BSPT N/A 5/8 in N/A 1/2 N/A 2.06 in N/A .97 in N/A .75 in N/A 7/8 in N/A .47 in
    12-12 T2HFK N/A Tube to BSPT N/A 3/4 in N/A 3/4 N/A 2.14 in N/A .97 in N/A .75 in N/A 1 1/16 in N/A .47 in
    16-16 T2HFK N/A Tube to BSPT N/A 1 in N/A 1 N/A 2.68 in N/A 1.22 in N/A .94 in N/A 1 3/8 in N/A .41 in
    2MA2K N/A Tube to BSPT N/A 1/8 in N/A 1/8 N/A 1.16 in N/A .54 in N/A .38 in N/A 7/16 in N/A .07 in
    2MA4K N/A Tube to BSPT N/A 1/8 in N/A 1/4 N/A 1.39 in N/A .54 in N/A .56 in N/A 9/16 in N/A .07 in
    4MA2K N/A Tube to BSPT N/A 1/4 in N/A 1/8 N/A 1.25 in N/A .63 in N/A .38 in N/A 7/16 in N/A .16 in
    4MA4K N/A Tube to BSPT N/A 1/4 in N/A 1/4 N/A 1.46 in N/A .63 in N/A .56 in N/A 9/16 in N/A .16 in
    4MA6K N/A Tube to BSPT N/A 1/4 in N/A 3/8 N/A 1.44 in N/A .63 in N/A .56 in N/A 11/16 in N/A .16 in
    4MA8K N/A Tube to BSPT N/A 1/4 in N/A 1/2 N/A 1.66 in N/A .66 in N/A .75 in N/A 7/8 in N/A .22 in
    5MA2K N/A Tube to BSPT N/A 5/16 in N/A 1/8 N/A 1.29 in N/A .66 in N/A .38 in N/A 7/16 in N/A .22 in
    Unit of Measure
    1 2