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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.
  • Tube stub is pre-grooved as standard.
  • Inch sizes 1, 2, and 3 and metric sizes 2, 3, and 4mm do not have grooves.
  • Sizes 20, 24, 32 require additional lubrication prior to assembly.
    • NPT Tube End Male Adapter for fractional tube
    Unit of Measure
    1 2 3 

    Item #

    Connection Type

    Tube O.D.

    NPT Pipe Thread

    A

    R

    K

    W HEX

    Bore

    1-2 T2HF N/A Tube to NPT N/A 1/16 in N/A 1/8 N/A 1.00 in N/A .38 in N/A .38 in N/A 7/16 in N/A .03 in
    2-2 T2HF N/A Tube to NPT N/A 1/8 in N/A 1/8 N/A 1.16 in N/A .38 in N/A .54 in N/A 7/16 in N/A .08 in
    2-4 T2HF N/A Tube to NPT N/A 1/8 in N/A 1/4 N/A 1.38 in N/A .56 in N/A .54 in N/A 9/16 in N/A .08 in
    3-2 T2HF N/A Tube to NPT N/A 3/16 in N/A 1/8 N/A 1.20 in N/A .38 in N/A .58 in N/A 7/16 in N/A .12 in
    3-4 T2HF N/A Tube to NPT N/A 3/16 in N/A 1/4 N/A 1.42 in N/A .56 in N/A .58 in N/A 9/16 in N/A .12 in
    4-2 T2HF N/A Tube to NPT N/A 1/4 in N/A 1/8 N/A 1.25 in N/A .38 in N/A .63 in N/A 7/16 in N/A .16 in
    4-4 T2HF N/A Tube to NPT N/A 1/4 in N/A 1/4 N/A 1.46 in N/A .56 in N/A .63 in N/A 9/16 in N/A .16 in
    4-6 T2HF N/A Tube to NPT N/A 1/4 in N/A 3/8 N/A 1.49 in N/A .56 in N/A .63 in N/A 11/16 in N/A .16 in
    4-8 T2HF N/A Tube to NPT N/A 1/4 in N/A 1/2 N/A 1.71 in N/A .76 in N/A .63 in N/A 7/8 in N/A .16 in
    5-2 T2HF N/A Tube to NPT N/A 5/16 in N/A 1/8 N/A 1.29 in N/A .38 in N/A .66 in N/A 7/16 in N/A .22 in
    5-4 T2HF N/A Tube to NPT N/A 5/16 in N/A 1/4 N/A 1.50 in N/A .56 in N/A .66 in N/A 9/16 in N/A .22 in
    5-6 T2HF N/A Tube to NPT N/A 5/16 in N/A 3/8 N/A 1.53 in N/A .56 in N/A .66 in N/A 11/16 in N/A .22 in
    5-8 T2HF N/A Tube to NPT N/A 5/16 in N/A 1/2 N/A 1.74 in N/A .76 in N/A .66 in N/A 7/8 in N/A .22 in
    6-2 T2HF N/A Tube to NPT N/A 3/8 in N/A 1/8 N/A 1.32 in N/A .38 in N/A .69 in N/A 7/16 in N/A .28 in
    6-4 T2HF N/A Tube to NPT N/A 3/8 in N/A 1/4 N/A 1.53 in N/A .56 in N/A .69 in N/A 9/16 in N/A .28 in
    6-6 T2HF N/A Tube to NPT N/A 3/8 in N/A 3/8 N/A 1.56 in N/A .56 in N/A .69 in N/A 11/16 in N/A .28 in
    6-8 T2HF N/A Tube to NPT N/A 3/8 in N/A 1/2 N/A 1.78 in N/A .75 in N/A .69 in N/A 7/8 in N/A .28 in
    8-4 T2HF N/A Tube to NPT N/A 1/2 in N/A 1/4 N/A 1.75 in N/A .56 in N/A .91 in N/A 9/16 in N/A .28 in
    8-6 T2HF N/A Tube to NPT N/A 1/2 in N/A 3/8 N/A 1.78 in N/A .56 in N/A .91 in N/A 11/16 in N/A .38 in
    8-8 T2HF N/A Tube to NPT N/A 1/2 in N/A 1/2 N/A 2.00 in N/A .75 in N/A .91 in N/A 7/8 in N/A .38 in
    10-8 T2HF N/A Tube to NPT N/A 5/8 in N/A 1/2 N/A 2.06 in N/A .75 in N/A .97 in N/A 7/8 in N/A .47 in
    12-8 T2HF N/A Tube to NPT N/A 3/4 in N/A 1/2 N/A 2.06 in N/A .75 in N/A .97 in N/A 7/8 in N/A .47 in
    12-12 T2HF N/A Tube to NPT N/A 3/4 in N/A 3/4 N/A 2.06 in N/A .75 in N/A .97 in N/A 1 1/16 in N/A .58 in
    12-16 T2HF N/A Tube to NPT N/A 3/4 in N/A 1 N/A 2.41 in N/A .94 in N/A .97 in N/A 1 3/8 in N/A .58 in
    16-12 T2HF N/A Tube to NPT N/A 1 in N/A 3/4 N/A 2.31 in N/A .75 in N/A 1.22 in N/A 1 1/16 in N/A .81 in
    Unit of Measure
    1 2 3