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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.
  • Bonded sealing washer must be used with this design, see page 76.
    • BSPP Tube End Male Adapter for fractional tube
    Unit of Measure
    1 2 

    Item #

    Connection Type

    Tube O.D.

    BSPP Thread

    A

    K

    R

    W HEX

    Bore

    2-2R T2HF N/A Tube to BSPP N/A 1/8 in N/A 1/8 N/A 1.09 in N/A .53 in N/A .28 in N/A 9/16 in N/A .05 in
    2-4R T2HF N/A Tube to BSPP N/A 1/8 in N/A 1/4 N/A 1.31 in N/A .53 in N/A .44 in N/A 3/4 in N/A .05 in
    4-2R T2HF N/A Tube to BSPP N/A 1/4 in N/A 1/8 N/A 1.19 in N/A .63 in N/A .28 in N/A 9/16 in N/A .16 in
    4-4R T2HF N/A Tube to BSPP N/A 1/4 in N/A 1/4 N/A 1.50 in N/A .63 in N/A .44 in N/A 3/4 in N/A .18 in
    6-2R T2HF N/A Tube to BSPP N/A 3/8 in N/A 1/8 N/A 1.34 in N/A .69 in N/A .28 in N/A 3/4 in N/A .05 in
    6-4R T2HF N/A Tube to BSPP N/A 3/8 in N/A 1/4 N/A 1.47 in N/A .69 in N/A .44 in N/A 3/4 in N/A .25 in
    6-6R T2HF N/A Tube to BSPP N/A 3/8 in N/A 3/8 N/A 1.50 in N/A .69 in N/A .44 in N/A 7/8 in N/A .28 in
    6-8R T2HF N/A Tube to BSPP N/A 3/8 in N/A 1/2 N/A 1.69 in N/A .69 in N/A .56 in N/A 1 1/16 in N/A .28 in
    8-4R T2HF N/A Tube to BSPP N/A 1/2 in N/A 1/4 N/A 1.69 in N/A .91 in N/A .44 in N/A 3/4 in N/A .25 in
    8-6R T2HF N/A Tube to BSPP N/A 1/2 in N/A 3/8 N/A 1.72 in N/A .91 in N/A .44 in N/A 7/8 in N/A .31 in
    8-8R T2HF N/A Tube to BSPP N/A 1/2 in N/A 1/2 N/A 1.94 in N/A .91 in N/A .56 in N/A 1 1/16 in N/A .39 in
    10-8R T2HF N/A Tube to BSPP N/A 5/8 in N/A 1/2 N/A 1.97 in N/A .97 in N/A .56 in N/A 1 1/16 in N/A .47 in
    12-12R T2HF N/A Tube to BSPP N/A 3/4 in N/A 3/4 N/A 2.09 in N/A .97 in N/A .63 in N/A 1 5/16 in N/A .58 in
    16-16R T2HF N/A Tube to BSPP N/A 1 in N/A 1 N/A 2.53 in N/A 1.22 in N/A .72 in N/A 1 5/8 in N/A .80 in
    2MA2R N/A Tube to BSPP N/A 1/8 in N/A 1/8 N/A 1.09 in N/A .53 in N/A .28 in N/A 9/16 in N/A .05 in
    2MA4R N/A Tube to BSPP N/A 1/8 in N/A 1/4 N/A 1.31 in N/A .53 in N/A .44 in N/A 3/4 in N/A .05 in
    4MA2R N/A Tube to BSPP N/A 1/4 in N/A 1/8 N/A 1.19 in N/A .63 in N/A .28 in N/A 9/16 in N/A .16 in
    4MA4R N/A Tube to BSPP N/A 1/4 in N/A 1/4 N/A 1.50 in N/A .63 in N/A .44 in N/A 3/4 in N/A .18 in
    6MA2R N/A Tube to BSPP N/A 3/8 in N/A 1/8 N/A 1.34 in N/A .69 in N/A .28 in N/A 3/4 in N/A .05 in
    6MA4R N/A Tube to BSPP N/A 3/8 in N/A 1/4 N/A 1.47 in N/A .69 in N/A .44 in N/A 3/4 in N/A .25 in
    6MA6R N/A Tube to BSPP N/A 3/8 in N/A 3/8 N/A 1.50 in N/A .69 in N/A .44 in N/A 7/8 in N/A .28 in
    6MA8R N/A Tube to BSPP N/A 3/8 in N/A 1/2 N/A 1.69 in N/A .69 in N/A .56 in N/A 1 1/16 in N/A .28 in
    8MA4R N/A Tube to BSPP N/A 1/2 in N/A 1/4 N/A 1.69 in N/A .91 in N/A .44 in N/A 3/4 in N/A .25 in
    8MA6R N/A Tube to BSPP N/A 1/2 in N/A 3/8 N/A 1.72 in N/A .91 in N/A .44 in N/A 7/8 in N/A .31 in
    8MA8R N/A Tube to BSPP N/A 1/2 in N/A 1/2 N/A 1.94 in N/A .91 in N/A .56 in N/A 1 1/16 in N/A .39 in
    Unit of Measure
    1 2