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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:
  • Metric Tube to Inch Tube
  • Dimensions for reference only, subject to change.
  • A, C1 and C2 dimensions are typical finger-tight.
    • Conversion Union for metric tube
    Unit of Measure
    1 2 

    Item #

    Connection Type

    T1 Tube O.D.

    T2 Tube O.D.

    A

    C1

    C2

    W HEX

    HBZ 3-1/8 N/A CPI™ to CPI™ N/A 3.0 mm N/A 1/8 in N/A 36.3 mm N/A 15.3 mm N/A 15.2 mm N/A 12.0 mm
    HBZ 4-1/8 N/A CPI™ to CPI™ N/A 4.0 mm N/A 1/8 in N/A 36.5 mm N/A 16.1 mm N/A 15.2 mm N/A 12.0 mm
    HBZ 4-1/4 N/A CPI™ to CPI™ N/A 4.0 mm N/A 1/4 in N/A 39.3 mm N/A 16.1 mm N/A 17.8 mm N/A 14.0 mm
    HBZ 6-1/8 N/A CPI™ to CPI™ N/A 6.0 mm N/A 1/8 in N/A 38.5 mm N/A 17.7 mm N/A 15.2 mm N/A 14.0 mm
    HBZ 6-1/4 N/A CPI™ to CPI™ N/A 6.0 mm N/A 1/4 in N/A 41.1 mm N/A 17.7 mm N/A 17.8 mm N/A 14.0 mm
    HBZ 6-5/16 N/A CPI™ to CPI™ N/A 6.0 mm N/A 5/16 in N/A 42.3 mm N/A 17.7 mm N/A 18.5 mm N/A 14.0 mm
    HBZ 8-1/4 N/A CPI™ to CPI™ N/A 8.0 mm N/A 1/4 in N/A 42.3 mm N/A 18.6 mm N/A 17.8 mm N/A 15.0 mm
    HBZ 8-3/8 N/A CPI™ to CPI™ N/A 8.0 mm N/A 3/8 in N/A 44.0 mm N/A 18.6 mm N/A 19.3 mm N/A 15.0 mm
    HBZ 10-1/8 N/A CPI™ to CPI™ N/A 10.0 mm N/A 1/8 in N/A 41.8 mm N/A 19.5 mm N/A 15.2 mm N/A 18.0 mm
    HBZ 10-1/4 N/A CPI™ to CPI™ N/A 10.0 mm N/A 1/4 in N/A 44.5 mm N/A 19.5 mm N/A 17.8 mm N/A 18.0 mm
    HBZ 10-3/8 N/A CPI™ to CPI™ N/A 10.0 mm N/A 3/8 in N/A 46.0 mm N/A 19.5 mm N/A 19.3 mm N/A 18.0 mm
    HBZ 12-3/8 N/A CPI™ to CPI™ N/A 12.0 mm N/A 3/8 in N/A 48.4 mm N/A 22.0 mm N/A 19.3 mm N/A 22.0 mm
    HBZ 12-1/2 N/A CPI™ to CPI™ N/A 12.0 mm N/A 1/2 in N/A 51.1 mm N/A 22.0 mm N/A 22.1 mm N/A 22.0 mm
    HBZ 15-1/2 N/A CPI™ to CPI™ N/A 15.0 mm N/A 1/2 in N/A 52.0 mm N/A 22.0 mm N/A 22.1 mm N/A 24.0 mm
    HBZ 16-3/8 N/A CPI™ to CPI™ N/A 16.0 mm N/A 3/8 in N/A 52.0 mm N/A 22.0 mm N/A 19.3 mm N/A 24.0 mm
    HBZ 18-3/4 N/A CPI™ to CPI™ N/A 18.0 mm N/A 3/4 in N/A 53.5 mm N/A 22.0 mm N/A 22.1 mm N/A 27.0 mm
    M3CU2 N/A A-LOK® to A-LOK® N/A 3.0 mm N/A 1/8 in N/A 36.3 mm N/A 15.3 mm N/A 15.2 mm N/A 12.0 mm
    M4CU2 N/A A-LOK® to A-LOK® N/A 4.0 mm N/A 1/8 in N/A 36.5 mm N/A 16.1 mm N/A 15.2 mm N/A 12.0 mm
    M4CU4 N/A A-LOK® to A-LOK® N/A 4.0 mm N/A 1/4 in N/A 39.3 mm N/A 16.1 mm N/A 17.8 mm N/A 14.0 mm
    M6CU2 N/A A-LOK® to A-LOK® N/A 6.0 mm N/A 1/8 in N/A 38.5 mm N/A 17.7 mm N/A 15.2 mm N/A 14.0 mm
    M6CU4 N/A A-LOK® to A-LOK® N/A 6.0 mm N/A 1/4 in N/A 41.1 mm N/A 17.7 mm N/A 17.8 mm N/A 14.0 mm
    M6CU5 N/A A-LOK® to A-LOK® N/A 6.0 mm N/A 5/16 in N/A 42.3 mm N/A 17.7 mm N/A 18.5 mm N/A 14.0 mm
    M8CU4 N/A A-LOK® to A-LOK® N/A 8.0 mm N/A 1/4 in N/A 42.3 mm N/A 18.6 mm N/A 17.8 mm N/A 15.0 mm
    M8CU6 N/A A-LOK® to A-LOK® N/A 8.0 mm N/A 3/8 in N/A 44.0 mm N/A 18.6 mm N/A 19.3 mm N/A 15.0 mm
    M10CU2 N/A A-LOK® to A-LOK® N/A 10.0 mm N/A 1/8 in N/A 41.8 mm N/A 19.5 mm N/A 15.2 mm N/A 18.0 mm
    Unit of Measure
    1 2