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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.
    • Thermocouple Connector for fractional tube
    Unit of Measure
    1 2 

    Item #

    Connection Type

    NPT Pipe Thread

    A

    C

    R

    W HEX

    2MTC1N N/A A-LOK® to NPT N/A 1/16 N/A 1.17 in N/A .60 in N/A .38 in N/A 3/8 in
    2MTC2N 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
    2MTC4N 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
    3MTC2N 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
    3MTC4N 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
    4MTC2N 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
    4MTC4N 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
    4MTC6N N/A A-LOK® to NPT N/A 3/8 N/A 1.60 in N/A .70 in N/A .56 in N/A 11/16 in
    4MTC8N N/A A-LOK® to NPT N/A 1/2 N/A 1.87 in N/A .70 in N/A .76 in N/A 7/8 in
    5MTC4N 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
    6MTC4N 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
    6MTC6N 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
    6MTC8N 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
    6MTC12N 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
    8MTC8N N/A A-LOK® to NPT N/A 1/2 N/A 1.93 in N/A .87 in N/A .76 in N/A 7/8 in
    8MTC12N N/A A-LOK® to NPT N/A 3/4 N/A 1.99 in N/A .87 in N/A .75 in N/A 1 1/16 in
    10MTC12N N/A A-LOK® to NPT N/A 3/4 N/A 1.99 in N/A .87 in N/A .75 in N/A 1 1/16 in
    12MTC12N N/A A-LOK® to NPT N/A 3/4 N/A 1.99 in N/A .87 in N/A .75 in N/A 1 1/16 in
    16MTC16N N/A A-LOK® to NPT N/A 1 N/A 2.46 in N/A 1.05 in N/A .94 in N/A 1 3/8 in
    Unit of Measure
    1 2