• Bulkhead Union for metric tube
  • Bulkhead Union for metric tube - dimensions
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, C1 and C2 dimensions are typical finger-tight.
  • For replacement bulkhead nuts, see page 77, Part BN.
  • For reducer sizes call out short end first.
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    Item #

    Tube O.D.

    A

    C1

    C2

    L

    W HEX

    Bulkhead Hole Drill Size

    Maximum Bulkhead Thickness

    N/A 3.0 mm N/A 51.3 mm N/A 15.3 mm N/A 31.2 mm N/A 24.6 mm N/A 14.0 mm N/A 8.3 mm N/A 12.7 mm
    N/A 4.0 mm N/A 53.7 mm N/A 16.1 mm N/A 32.0 mm N/A 25.4 mm N/A 14.0 mm N/A 9.9 mm N/A 12.7 mm
    N/A 6.0 mm N/A 57.9 mm N/A 17.7 mm N/A 33.6 mm N/A 26.2 mm N/A 16.0 mm N/A 11.5 mm N/A 10.2 mm
    N/A 8.0 mm N/A 61.0 mm N/A 18.6 mm N/A 36.7 mm N/A 28.7 mm N/A 18.0 mm N/A 13.1 mm N/A 11.2 mm
    N/A 10.0 mm N/A 63.6 mm N/A 19.5 mm N/A 37.0 mm N/A 29.3 mm N/A 22.0 mm N/A 16.3 mm N/A 11.2 mm
    N/A 12.0 mm N/A 71.0 mm N/A 22.0 mm N/A 41.8 mm N/A 31.7 mm N/A 24.0 mm N/A 19.5 mm N/A 12.7 mm
    N/A 15.0 mm N/A 72.5 mm N/A 22.0 mm N/A 42.6 mm N/A 32.5 mm N/A 27.0 mm N/A 22.5 mm N/A 12.7 mm
    N/A 16.0 mm N/A 72.6 mm N/A 22.0 mm N/A 42.6 mm N/A 32.5 mm N/A 27.0 mm N/A 22.5 mm N/A 12.7 mm
    N/A 18.0 mm N/A 78.9 mm N/A 22.0 mm N/A 47.4 mm N/A 37.3 mm N/A 30.0 mm N/A 26.0 mm N/A 16.8 mm
    N/A 20.0 mm N/A 88.2 mm N/A 22.0 mm N/A 51.0 mm N/A 40.9 mm N/A 35.0 mm N/A 29.0 mm N/A 19.0 mm
    N/A 25.0 mm N/A 95.8 mm N/A 26.5 mm N/A 54.4 mm N/A 42.2 mm N/A 41.0 mm N/A 33.8 mm N/A 24.0 mm
    N/A 3.0 mm N/A 51.3 mm N/A 15.3 mm N/A 31.2 mm N/A 24.6 mm N/A 14.0 mm N/A 8.3 mm N/A 12.7 mm
    N/A 4.0 mm N/A 53.7 mm N/A 16.1 mm N/A 32.0 mm N/A 25.4 mm N/A 14.0 mm N/A 9.9 mm N/A 12.7 mm
    N/A 6.0 mm N/A 57.9 mm N/A 17.7 mm N/A 33.6 mm N/A 26.2 mm N/A 16.0 mm N/A 11.5 mm N/A 10.2 mm
    N/A 8.0 mm N/A 61.0 mm N/A 18.6 mm N/A 36.7 mm N/A 28.7 mm N/A 18.0 mm N/A 13.1 mm N/A 11.2 mm
    N/A 10.0 mm N/A 63.6 mm N/A 19.5 mm N/A 37.0 mm N/A 29.3 mm N/A 22.0 mm N/A 16.3 mm N/A 11.2 mm
    N/A 12.0 mm N/A 71.0 mm N/A 22.0 mm N/A 41.8 mm N/A 31.7 mm N/A 24.0 mm N/A 19.5 mm N/A 12.7 mm
    N/A 15.0 mm N/A 72.5 mm N/A 22.0 mm N/A 42.6 mm N/A 32.5 mm N/A 27.0 mm N/A 22.5 mm N/A 12.7 mm
    N/A 16.0 mm N/A 72.6 mm N/A 22.0 mm N/A 42.6 mm N/A 32.5 mm N/A 27.0 mm N/A 22.5 mm N/A 12.7 mm
    N/A 18.0 mm N/A 78.9 mm N/A 22.0 mm N/A 47.4 mm N/A 37.3 mm N/A 30.0 mm N/A 26.0 mm N/A 16.8 mm
    N/A 20.0 mm N/A 88.2 mm N/A 22.0 mm N/A 51.0 mm N/A 40.9 mm N/A 35.0 mm N/A 29.0 mm N/A 19.0 mm
    N/A 25.0 mm N/A 95.8 mm N/A 26.5 mm N/A 54.4 mm N/A 42.2 mm N/A 41.0 mm N/A 33.8 mm N/A 24.0 mm
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