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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.
  • Sealing washer must be used with BSPP end shown ISO228/1 (Form A). See page 76.
  • For Form B undercut, add a “B” before the “R.” e.g. M6MSC1/4BR.
    • BSPP Male Connector for metric tube
    Unit of Measure
    1 2 3 

    Item #

    Connection Type

    Tube O.D.

    BSPP Thread

    A

    C

    R

    X

    W HEX

    FBZ 2-1/8R N/A CPI™ to BSPP N/A 2.0 mm N/A 1/8 N/A 28.4 mm N/A 15.3 mm N/A 7.1 mm N/A 14.0 mm N/A 13.7 mm
    FBZ 3-1/8R N/A CPI™ to BSPP N/A 3.0 mm N/A 1/8 N/A 30.0 mm N/A 15.3 mm N/A 7.1 mm N/A 13.7 mm N/A 14.0 mm
    FBZ 3-1/4R N/A CPI™ to BSPP N/A 3.0 mm N/A 1/4 N/A 35.3 mm N/A 15.3 mm N/A 11.2 mm N/A 17.8 mm N/A 19.0 mm
    FBZ 6-1/8R N/A CPI™ to BSPP N/A 6.0 mm N/A 1/8 N/A 32.5 mm N/A 17.7 mm N/A 7.1 mm N/A 13.7 mm N/A 14.0 mm
    FBZ 6-1/4R N/A CPI™ to BSPP N/A 6.0 mm N/A 1/4 N/A 37.7 mm N/A 17.7 mm N/A 11.2 mm N/A 17.8 mm N/A 19.0 mm
    FBZ 6-3/8R N/A CPI™ to BSPP N/A 6.0 mm N/A 3/8 N/A 39.0 mm N/A 17.7 mm N/A 11.2 mm N/A 21.8 mm N/A 22.0 mm
    FBZ 6-1/2R N/A CPI™ to BSPP N/A 6.0 mm N/A 1/2 N/A 45.6 mm N/A 17.7 mm N/A 14.2 mm N/A 25.7 mm N/A 27.0 mm
    FBZ 8-1/8R N/A CPI™ to BSPP N/A 8.0 mm N/A 1/8 N/A 33.1 mm N/A 18.6 mm N/A 7.1 mm N/A 15.0 mm N/A 13.7 mm
    FBZ 8-1/4R N/A CPI™ to BSPP N/A 8.0 mm N/A 1/4 N/A 38.5 mm N/A 18.6 mm N/A 11.2 mm N/A 17.8 mm N/A 19.0 mm
    FBZ 8-3/8R N/A CPI™ to BSPP N/A 8.0 mm N/A 3/8 N/A 39.8 mm N/A 18.6 mm N/A 11.2 mm N/A 21.8 mm N/A 22.0 mm
    FBZ 8-1/2R N/A CPI™ to BSPP N/A 8.0 mm N/A 1/2 N/A 45.6 mm N/A 18.6 mm N/A 14.2 mm N/A 25.7 mm N/A 27.0 mm
    FBZ 10-1/4R N/A CPI™ to BSPP N/A 10.0 mm N/A 1/4 N/A 39.4 mm N/A 19.5 mm N/A 11.2 mm N/A 17.8 mm N/A 19.0 mm
    FBZ 10-3/8R N/A CPI™ to BSPP N/A 10.0 mm N/A 3/8 N/A 40.6 mm N/A 19.5 mm N/A 11.2 mm N/A 21.8 mm N/A 22.0 mm
    FBZ 10-1/2R N/A CPI™ to BSPP N/A 10.0 mm N/A 1/2 N/A 46.5 mm N/A 19.5 mm N/A 14.2 mm N/A 25.7 mm N/A 27.0 mm
    FBZ 12-1/4R N/A CPI™ to BSPP N/A 12.0 mm N/A 1/4 N/A 42.6 mm N/A 22.0 mm N/A 11.2 mm N/A 17.8 mm N/A 22.0 mm
    FBZ 12-3/8R N/A CPI™ to BSPP N/A 12.0 mm N/A 3/8 N/A 43.1 mm N/A 22.0 mm N/A 11.2 mm N/A 21.8 mm N/A 22.0 mm
    FBZ 12-1/2R N/A CPI™ to BSPP N/A 12.0 mm N/A 1/2 N/A 49.0 mm N/A 22.0 mm N/A 14.2 mm N/A 25.7 mm N/A 27.0 mm
    FBZ 12-3/4R N/A CPI™ to BSPP N/A 12.0 mm N/A 3/4 N/A 52.8 mm N/A 22.0 mm N/A 16.0 mm N/A 31.8 mm N/A 35.0 mm
    FBZ 16-3/8R N/A CPI™ to BSPP N/A 16.0 mm N/A 3/8 N/A 43.5 mm N/A 22.0 mm N/A 11.2 mm N/A 22.0 mm N/A 21.8 mm
    FBZ 16-1/2R N/A CPI™ to BSPP N/A 16.0 mm N/A 1/2 N/A 49.0 mm N/A 22.0 mm N/A 14.2 mm N/A 26.0 mm N/A 27.0 mm
    FBZ 18-1/2R N/A CPI™ to BSPP N/A 18.0 mm N/A 1/2 N/A 49.0 mm N/A 22.0 mm N/A 14.2 mm N/A 26.0 mm N/A 27.0 mm
    FBZ 18-3/4R N/A CPI™ to BSPP N/A 18.0 mm N/A 3/4 N/A 53.1 mm N/A 22.0 mm N/A 16.0 mm N/A 35.0 mm N/A 32.0 mm
    FBZ 20-1/2R N/A CPI™ to BSPP N/A 20.0 mm N/A 1/2 N/A 50.5 mm N/A 22.0 mm N/A 14.2 mm N/A 30.0 mm N/A 25.7 mm
    FBZ 20-3/4R N/A CPI™ to BSPP N/A 20.0 mm N/A 3/4 N/A 52.8 mm N/A 22.0 mm N/A 16.0 mm N/A 32.0 mm N/A 35.0 mm
    FBZ 22-3/4R N/A CPI™ to BSPP N/A 22.0 mm N/A 3/4 N/A 52.8 mm N/A 22.0 mm N/A 16.0 mm N/A 32.0 mm N/A 35.0 mm
    Unit of Measure
    1 2 3