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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.
  • Parts are supplied with nitrile o-rings as standard. For Fluorocarbon o-rings, add the suffix "-VO". Other o-rings available upon request.
    • Male Connector to O-Ring Pipe Thread for fractional tube
    Unit of Measure
    1 2 

    Item #

    Connection Type

    NPT Pipe Size

    A

    C

    R

    X Dia

    W HEX

    O-Ring Arp Uniform Dash No.

    2M3SC4 N/A A-LOK® to NPT N/A 1/4 N/A 1.43 in N/A .60 in N/A .39 in N/A 0.93 in N/A 15/16 in N/A 2-113
    3M3SC2 N/A A-LOK® to NPT N/A 1/8 N/A 1.33 in N/A .64 in N/A .29 in N/A 0.74 in N/A 3/4 in N/A 2-111
    3M3SC4 N/A A-LOK® to NPT N/A 1/4 N/A 1.47 in N/A .64 in N/A .39 in N/A 0.93 in N/A 15/16 in N/A 2-113
    4M3SC2 N/A A-LOK® to NPT N/A 1/8 N/A 1.39 in N/A .70 in N/A .29 in N/A 0.74 in N/A 3/4 in N/A 2-111
    4M3SC4 N/A A-LOK® to NPT N/A 1/4 N/A 1.51 in N/A .70 in N/A .39 in N/A 0.93 in N/A 15/16 in N/A 2-113
    4M3SC6 N/A A-LOK® to NPT N/A 3/8 N/A 1.58 in N/A .70 in N/A .42 in N/A 1.12 in N/A 1 1/8 in N/A 2-116
    5M3SC2 N/A A-LOK® to NPT N/A 1/8 N/A 1.42 in N/A .73 in N/A .29 in N/A 0.74 in N/A 3/4 in N/A 2-111
    5M3SC4 N/A A-LOK® to NPT N/A 1/4 N/A 1.54 in N/A .73 in N/A .39 in N/A 0.93 in N/A 15/16 in N/A 2-113
    6M3SC2 N/A A-LOK® to NPT N/A 1/8 N/A 1.45 in N/A .76 in N/A .29 in N/A 0.74 in N/A 3/4 in N/A 2-111
    6M3SC4 N/A A-LOK® to NPT N/A 1/4 N/A 1.57 in N/A .76 in N/A .39 in N/A 0.93 in N/A 15/16 in N/A 2-113
    6M3SC6 N/A A-LOK® to NPT N/A 3/8 N/A 1.64 in N/A .76 in N/A .42 in N/A 1.12 in N/A 1 1/8 in N/A 2-116
    6M3SC8 N/A A-LOK® to NPT N/A 1/2 N/A 1.86 in N/A .76 in N/A .55 in N/A 1.30 in N/A 1 3/8 in N/A 2-212
    8M3SC4 N/A A-LOK® to NPT N/A 1/4 N/A 1.68 in N/A .87 in N/A .39 in N/A 0.93 in N/A 15/16 in N/A 2-113
    8M3SC6 N/A A-LOK® to NPT N/A 3/8 N/A 1.76 in N/A .87 in N/A .42 in N/A 1.12 in N/A 1 1/8 in N/A 2-116
    8M3SC8 N/A A-LOK® to NPT N/A 1/2 N/A 1.98 in N/A .87 in N/A .55 in N/A 1.30 in N/A 1 3/8 in N/A 2-212
    10M3SC8 N/A A-LOK® to NPT N/A 1/2 N/A 1.97 in N/A .87 in N/A .55 in N/A 1.30 in N/A 1 3/8 in N/A 2-212
    10M3SC12 N/A A-LOK® to NPT N/A 3/4 N/A 2.06 in N/A .87 in N/A .58 in N/A 1.49 in N/A 1 1/2 in N/A 2-215
    12M3SC8 N/A A-LOK® to NPT N/A 1/2 N/A 1.98 in N/A .87 in N/A .55 in N/A 1.30 in N/A 1 3/8 in N/A 2-212
    12M3SC12 N/A A-LOK® to NPT N/A 3/4 N/A 2.06 in N/A .87 in N/A .58 in N/A 1.49 in N/A 1 1/2 in N/A 2-215
    16M3SC12 N/A A-LOK® to NPT N/A 3/4 N/A 2.24 in N/A 1.05 in N/A .58 in N/A 1.49 in N/A 1 1/2 in N/A 2-215
    16M3SC16 N/A A-LOK® to NPT N/A 1 N/A 2.39 in N/A 1.05 in N/A .67 in N/A 1.74 in N/A 1 3/4 in N/A 2-219
    Unit of Measure
    1 2