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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.
  • Add -Z6 for assembly of nuts and ferrules on the tube stub end.
  • Parts are supplied with nitrile o-rings as standard. For Fluorocarbon o-rings, add the suffix "-VO". Other o-rings available upon request.
    • Tube End to O-Ring Pipe Thread for fractional tube
    Unit of Measure
    Items Tube End to O-Ring Pipe Thread for fractional tube
    4-2 T2HOF5
    Tube End to O-Ring Pipe Thread for fractional tube     		Tube End to O-Ring Pipe Thread for fractional tube
    4-4 T2HOF5
    Tube End to O-Ring Pipe Thread for fractional tube     		Tube End to O-Ring Pipe Thread for fractional tube
    4-6 T2HOF5
    Tube End to O-Ring Pipe Thread for fractional tube     		Tube End to O-Ring Pipe Thread for fractional tube
    5-2 T2HOF5
    Tube End to O-Ring Pipe Thread for fractional tube     		Tube End to O-Ring Pipe Thread for fractional tube
    5-4 T2HOF5
    Tube End to O-Ring Pipe Thread for fractional tube
    Connection Type N/A Tube x NPT
    Tube O.D. N/A 1/4 in N/A 1/4 in N/A 1/4 in N/A 5/16 in N/A 5/16 in
    NPT Pipe Thread N/A 1/8 N/A 1/4 N/A 3/8 N/A 1/8 N/A 1/4
    A N/A 1.33 in N/A 1.54 in N/A 1.60 in N/A 1.36 in N/A 1.58 in
    K N/A .64 in N/A .64 in N/A .64 in N/A .68 in N/A .68 in
    R N/A .41 in N/A .51 in N/A .54 in N/A .41 in N/A .51 in
    X Dia. N/A .74 in N/A .93 in N/A 1.12 in N/A .74 in N/A .93 in
    W HEX N/A 3/4 in N/A 15/16 in N/A 1 1/8 in N/A 3/4 in N/A 15/16 in
    O-Ring Arp Uniform Dash No. N/A 2-111 N/A 2-113 N/A 2-116 N/A 2-111 N/A 2-113