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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 and C dimensions are typical finger-tight.
  • Tube stub is pre-grooved as standard. Generic (non-grooved) can be ordered through Quick Response Department.
  • Size 1, 2, and 3 do not require a groove.
  • Add -Z6 for assembly of nuts and ferrules on the tube stub end.
    • Tube End Converter for fractional tube to metric tube
    Unit of Measure
    1 2 

    Item #

    Connection Type

    T1 Turned End Tube O.D.

    T2 Machined End Tube O.D.

    A

    C

    K

    W A/F HEX

    Bore

    TRBZ 1/8-3 N/A Tube to CPI™ N/A 1/8 in N/A 3.0 mm N/A 34.3 mm N/A 15.3 mm N/A 13.5 mm N/A 12.0 mm N/A 1.3 mm
    TRBZ 1/4-3 N/A Tube to CPI™ N/A 1/4 in N/A 3.0 mm N/A 36.1 mm N/A 15.3 mm N/A 16.0 mm N/A 12.0 mm N/A 4.8 mm
    TRBZ 1/4-6 N/A Tube to CPI™ N/A 1/4 in N/A 6.0 mm N/A 39.3 mm N/A 17.7 mm N/A 16.0 mm N/A 14.0 mm N/A 4.8 mm
    TRBZ 5/16-6 N/A Tube to CPI™ N/A 5/16 in N/A 6.0 mm N/A 40.0 mm N/A 17.7 mm N/A 16.8 mm N/A 14.0 mm N/A 6.4 mm
    TRBZ 3/8-6 N/A Tube to CPI™ N/A 3/8 in N/A 6.0 mm N/A 40.8 mm N/A 17.7 mm N/A 17.5 mm N/A 14.0 mm N/A 7.1 mm
    TRBZ 1/2-6 N/A Tube to CPI™ N/A 1/2 in N/A 6.0 mm N/A 46.4 mm N/A 17.7 mm N/A 23.1 mm N/A 14.0 mm N/A 4.8 mm
    TRBZ 3/8-8 N/A Tube to CPI™ N/A 3/8 in N/A 8.0 mm N/A 42.0 mm N/A 18.6 mm N/A 17.5 mm N/A 15.0 mm N/A 7.1 mm
    TRBZ 1/2-8 N/A Tube to CPI™ N/A 1/2 in N/A 8.0 mm N/A 47.5 mm N/A 18.6 mm N/A 23.1 mm N/A 15.0 mm N/A 9.9 mm
    TRBZ 3/8-10 N/A Tube to CPI™ N/A 3/8 in N/A 10.0 mm N/A 44.4 mm N/A 19.5 mm N/A 17.5 mm N/A 18.0 mm N/A 7.1 mm
    TRBZ 1/2-10 N/A Tube to CPI™ N/A 1/2 in N/A 10.0 mm N/A 47.6 mm N/A 19.5 mm N/A 23.1 mm N/A 18.0 mm N/A 9.9 mm
    TRBZ 1/2-12 N/A Tube to CPI™ N/A 1/2 in N/A 12.0 mm N/A 52.3 mm N/A 22.0 mm N/A 23.1 mm N/A 22.0 mm N/A 9.9 mm
    TRBZ 3/4-12 N/A Tube to CPI™ N/A 3/4 in N/A 12.0 mm N/A 53.8 mm N/A 22.0 mm N/A 24.6 mm N/A 22.0 mm N/A 15.0 mm
    TRBZ 3/4-18 N/A Tube to CPI™ N/A 3/4 in N/A 18.0 mm N/A 57.5 mm N/A 22.0 mm N/A 24.6 mm N/A 27.0 mm N/A 15.0 mm
    2TUCM3 N/A Tube to A-LOK® N/A 1/8 in N/A 3.0 mm N/A 34.3 mm N/A 15.3 mm N/A 13.5 mm N/A 12.0 mm N/A 1.3 mm
    4TUCM3 N/A Tube to A-LOK® N/A 1/4 in N/A 3.0 mm N/A 36.1 mm N/A 15.3 mm N/A 16.0 mm N/A 12.0 mm N/A 4.8 mm
    4TUCM6 N/A Tube to A-LOK® N/A 1/4 in N/A 6.0 mm N/A 39.3 mm N/A 17.7 mm N/A 16.0 mm N/A 14.0 mm N/A 4.8 mm
    5TUCM6 N/A Tube to A-LOK® N/A 5/16 in N/A 6.0 mm N/A 40.0 mm N/A 17.7 mm N/A 16.8 mm N/A 14.0 mm N/A 6.4 mm
    6TUCM6 N/A Tube to A-LOK® N/A 3/8 in N/A 6.0 mm N/A 40.8 mm N/A 17.7 mm N/A 17.5 mm N/A 14.0 mm N/A 7.1 mm
    8TUCM6 N/A Tube to A-LOK® N/A 1/2 in N/A 6.0 mm N/A 46.4 mm N/A 17.7 mm N/A 23.1 mm N/A 14.0 mm N/A 4.8 mm
    6TUCM8 N/A Tube to A-LOK® N/A 3/8 in N/A 8.0 mm N/A 42.0 mm N/A 18.6 mm N/A 17.5 mm N/A 15.0 mm N/A 7.1 mm
    8TUCM8 N/A Tube to A-LOK® N/A 1/2 in N/A 8.0 mm N/A 47.5 mm N/A 18.6 mm N/A 23.1 mm N/A 15.0 mm N/A 9.9 mm
    6TUCM10 N/A Tube to A-LOK® N/A 3/8 in N/A 10.0 mm N/A 44.4 mm N/A 19.5 mm N/A 17.5 mm N/A 18.0 mm N/A 7.1 mm
    8TUCM10 N/A Tube to A-LOK® N/A 1/2 in N/A 10.0 mm N/A 47.6 mm N/A 19.5 mm N/A 23.1 mm N/A 18.0 mm N/A 9.9 mm
    8TUCM12 N/A Tube to A-LOK® N/A 1/2 in N/A 12.0 mm N/A 52.3 mm N/A 22.0 mm N/A 23.1 mm N/A 22.0 mm N/A 9.9 mm
    12TUCM12 N/A Tube to A-LOK® N/A 3/4 in N/A 12.0 mm N/A 53.8 mm N/A 22.0 mm N/A 24.6 mm N/A 22.0 mm N/A 15.0 mm
    Unit of Measure
    1 2