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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.
  • Sizes 20, 24, 32 require additional lubrication prior to assembly.
    • NPT Male Connector for fractional tube
    Unit of Measure
    1 2 3 4 

    Item #

    Connection Type

    NPT Pipe Thread

    A

    C

    R

    W HEX

    2MSC2N N/A A-LOK® to NPT N/A 1/8 N/A 1.20 in N/A .60 in N/A .38 in N/A 7/16 in
    2MSC4N N/A A-LOK® to NPT N/A 1/4 N/A 1.40 in N/A .60 in N/A .56 in N/A 9/16 in
    2MSC6N N/A A-LOK® to NPT N/A 3/8 N/A 1.42 in N/A .60 in N/A .56 in N/A 11/16 in
    2MSC8N N/A A-LOK® to NPT N/A 1/2 N/A 1.67 in N/A .60 in N/A .76 in N/A 7/8 in
    3MSC1N N/A A-LOK® to NPT N/A 1/16 N/A 1.23 in N/A .64 in N/A .38 in N/A 7/16 in
    3MSC2N N/A A-LOK® to NPT N/A 1/8 N/A 1.23 in N/A .64 in N/A .38 in N/A 7/16 in
    3MSC4N N/A A-LOK® to NPT N/A 1/4 N/A 1.43 in N/A .64 in N/A .56 in N/A 9/16 in
    4MSC1N N/A A-LOK® to NPT N/A 1/16 N/A 1.29 in N/A .70 in N/A .38 in N/A 1/2 in
    4MSC2N N/A A-LOK® to NPT N/A 1/8 N/A 1.29 in N/A .70 in N/A .38 in N/A 1/2 in
    4MSC4N N/A A-LOK® to NPT N/A 1/4 N/A 1.49 in N/A .70 in N/A .56 in N/A 9/16 in
    4MSC6N N/A A-LOK® to NPT N/A 3/8 N/A 1.51 in N/A .70 in N/A .56 in N/A 11/16 in
    4MSC8N N/A A-LOK® to NPT N/A 1/2 N/A 1.76 in N/A .70 in N/A .76 in N/A 7/8 in
    4MSC12N N/A A-LOK® to NPT N/A 3/4 N/A 1.82 in N/A .70 in N/A .75 in N/A 1 1/16 in
    5MSC2N N/A A-LOK® to NPT N/A 1/8 N/A 1.34 in N/A .73 in N/A .38 in N/A 9/16 in
    5MSC4N N/A A-LOK® to NPT N/A 1/4 N/A 1.52 in N/A .73 in N/A .56 in N/A 9/16 in
    5MSC6N N/A A-LOK® to NPT N/A 3/8 N/A 1.55 in N/A .73 in N/A .56 in N/A 11/16 in
    5MSC8N N/A A-LOK® to NPT N/A 1/2 N/A 1.79 in N/A .73 in N/A .76 in N/A 7/8 in
    6MSC2N N/A A-LOK® to NPT N/A 1/8 N/A 1.38 in N/A .76 in N/A .38 in N/A 5/8 in
    6MSC4N N/A A-LOK® to NPT N/A 1/4 N/A 1.57 in N/A .76 in N/A .56 in N/A 5/8 in
    6MSC6N N/A A-LOK® to NPT N/A 3/8 N/A 1.57 in N/A .76 in N/A .56 in N/A 11/16 in
    6MSC8N N/A A-LOK® to NPT N/A 1/2 N/A 1.82 in N/A .76 in N/A .76 in N/A 7/8 in
    6MSC12N N/A A-LOK® to NPT N/A 3/4 N/A 1.88 in N/A .76 in N/A .75 in N/A 1 1/16 in
    8MSC2N N/A A-LOK® to NPT N/A 1/8 N/A 1.53 in N/A .87 in N/A .38 in N/A 13/16 in
    8MSC4N N/A A-LOK® to NPT N/A 1/4 N/A 1.71 in N/A .87 in N/A .56 in N/A 13/16 in
    8MSC6N N/A A-LOK® to NPT N/A 3/8 N/A 1.71 in N/A .87 in N/A .56 in N/A 13/16 in
    Unit of Measure
    1 2 3 4