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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.
  • Sizes 20, 24 require additional lubrication prior to assembly.
    • NPT Male Elbow for fractional tube
    Unit of Measure
    1 2 3 

    Item #

    Connection Type

    NPT Pipe Thread

    C

    H

    L

    R

    W HEX

    6MSEL6N N/A A-LOK® to NPT N/A 3/8 N/A 1.23 in N/A 1.13 in N/A .97 in N/A .56 in N/A 11/16 in
    6MSEL8N N/A A-LOK® to NPT N/A 1/2 N/A 1.31 in N/A 1.31 in N/A 1.02 in N/A .76 in N/A 13/16 in
    6MSEL12N N/A A-LOK® to NPT N/A 3/4 N/A 1.46 in N/A 1.46 in N/A 1.17 in N/A .75 in N/A 1 1/16 in
    8MSEL4N N/A A-LOK® to NPT N/A 1/4 N/A 1.42 in N/A 1.12 in N/A 1.02 in N/A .56 in N/A 13/16 in
    8MSEL6N N/A A-LOK® to NPT N/A 3/8 N/A 1.42 in N/A 1.12 in N/A 1.02 in N/A .56 in N/A 13/16 in
    8MSEL8N N/A A-LOK® to NPT N/A 1/2 N/A 1.42 in N/A 1.31 in N/A 1.02 in N/A .76 in N/A 13/16 in
    8MSEL12N N/A A-LOK® to NPT N/A 3/4 N/A 1.57 in N/A 1.46 in N/A 1.17 in N/A .75 in N/A 1 1/16 in
    10MSEL6N N/A A-LOK® to NPT N/A 3/8 N/A 1.50 in N/A 1.20 in N/A 1.10 in N/A .56 in N/A 15/16 in
    10MSEL8N N/A A-LOK® to NPT N/A 1/2 N/A 1.50 in N/A 1.39 in N/A 1.10 in N/A .76 in N/A 15/16 in
    10MSEL12N N/A A-LOK® to NPT N/A 3/4 N/A 1.57 in N/A 1.46 in N/A 1.17 in N/A .75 in N/A 1 1/16 in
    12MSEL8N N/A A-LOK® to NPT N/A 1/2 N/A 1.57 in N/A 1.46 in N/A 1.17 in N/A .76 in N/A 1 1/16 in
    12MSEL12N N/A A-LOK® to NPT N/A 3/4 N/A 1.57 in N/A 1.46 in N/A 1.17 in N/A .75 in N/A 1 1/16 in
    14MSEL12N N/A A-LOK® to NPT N/A 3/4 N/A 1.76 in N/A 1.65 in N/A 1.36 in N/A .75 in N/A 1 3/8 in
    16MSEL12N N/A A-LOK® to NPT N/A 3/4 N/A 1.93 in N/A 1.65 in N/A 1.45 in N/A .75 in N/A 1 3/8 in
    16MSEL16N N/A A-LOK® to NPT N/A 1 N/A 1.93 in N/A 1.84 in N/A 1.45 in N/A .94 in N/A 1 3/8 in
    20MSEL20N N/A A-LOK® to NPT N/A 1 1/4 N/A 2.61 in N/A 1.88 in N/A 1.75 in N/A .97 in N/A 1 5/8 in
    24MSEL24N N/A A-LOK® to NPT N/A 1 1/2 N/A 3.06 in N/A 2.38 in N/A 2.00 in N/A 1.00 in N/A 1 7/8 in
    32MSEL32N N/A A-LOK® to NPT N/A 2 N/A 4.22 in N/A 2.79 in N/A 2.75 in N/A 1.04 in N/A 2 13/16 in
    Unit of Measure
    1 2 3