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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.
  • C dimension is typical finger-tight.
    • NPT Male Elbow for metric tube
    Unit of Measure
    1 2 3 

    Item #

    Connection Type

    Tube O.D.

    NPT Pipe Thread

    C

    H

    L

    R

    W HEX

    M12MSEL3/4N N/A A-LOK® to NPT N/A 12.0 mm N/A 3/4 N/A 39.8 mm N/A 36.8 mm N/A 29.7 mm N/A 19.2 mm N/A 1 1/16 in
    M15MSEL1/2N N/A A-LOK® to NPT N/A 12.0 mm N/A 1/2 N/A 38.0 mm N/A 35.1 mm N/A 27.9 mm N/A 19.2 mm N/A 15/16 in
    M16MSEL3/8N N/A A-LOK® to NPT N/A 16.0 mm N/A 3/8 N/A 38.0 mm N/A 30.2 mm N/A 27.9 mm N/A 14.5 mm N/A 15/16 in
    M16MSEL1/2N N/A A-LOK® to NPT N/A 16.0 mm N/A 1/2 N/A 38.0 mm N/A 35.1 mm N/A 27.9 mm N/A 19.2 mm N/A 15/16 in
    M16MSEL3/4N N/A A-LOK® to NPT N/A 16.0 mm N/A 3/4 N/A 39.8 mm N/A 36.8 mm N/A 29.7 mm N/A 19.2 mm N/A 1 1/16 in
    M18MSEL1/2N N/A A-LOK® to NPT N/A 18.0 mm N/A 1/2 N/A 39.8 mm N/A 36.8 mm N/A 29.7 mm N/A 19.2 mm N/A 1 1/16 in
    M18MSEL3/4N N/A A-LOK® to NPT N/A 18.0 mm N/A 3/4 N/A 39.8 mm N/A 36.8 mm N/A 29.7 mm N/A 19.2 mm N/A 1 1/16 in
    M20MSEL1/2N N/A A-LOK® to NPT N/A 20.0 mm N/A 1/2 N/A 44.6 mm N/A 41.7 mm N/A 34.5 mm N/A 19.2 mm N/A 1 3/8 in
    M20MSEL3/4N N/A A-LOK® to NPT N/A 20.0 mm N/A 3/4 N/A 44.6 mm N/A 41.7 mm N/A 34.5 mm N/A 19.2 mm N/A 1 3/8 in
    M22MSEL3/4N N/A A-LOK® to NPT N/A 22.0 mm N/A 3/4 N/A 44.6 mm N/A 41.7 mm N/A 34.5 mm N/A 19.2 mm N/A 1 3/8 in
    M25MSEL3/4N N/A A-LOK® to NPT N/A 25.0 mm N/A 3/4 N/A 49.1 mm N/A 41.7 mm N/A 36.8 mm N/A 19.2 mm N/A 1 3/8 in
    M25MSEL1N N/A A-LOK® to NPT N/A 25.0 mm N/A 1 N/A 49.1 mm N/A 46.5 mm N/A 36.8 mm N/A 24.0 mm N/A 1 3/8 in
    Unit of Measure
    1 2 3