Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 205 views

    PIPE THREAD Dimension

    Uploaded by

    Ariel Anasco
    pipe thread dimensions

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd

    PIPE THREAD Dimension

    Uploaded by

    Ariel Anasco
    205 views2 pages
    pipe thread dimensions

    Original Title

    PIPE THREAD dimension.docx

    Copyright

    © Attribution Non-Commercial (BY-NC)

    Available Formats

    DOCX, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    pipe thread dimensions

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    205 views2 pages

    PIPE THREAD Dimension

    Uploaded by

    Ariel Anasco
    pipe thread dimensions

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 2

    PIPE / PIPE THREAD DIMENSIONS

    Nominal Pipe sizes do not match any of its actual physical dimensions The OD of pipe / fitting must be measured & compared to the table for identificationFor example, a 3/4" NPT pipe thread has an outside diameter of 1.050 inches and 14 threads per inch. Each thread size has a defined number of threads per inch (TPI), but several sizes have the same TPI; because of this, both the TPI and OD of the thread are required for positive identification of thread size.

    Male threads: Measure the outside diameter of the large portion of the thread at "A"; Find figure nearest this dimension in column 1 or 2 of chart. The dimension in column 3 will be your nominal pipe thread size.
    Column 1 Column 2

    Female Threads: Measure top diameter of thread at "B"; Find figure nearest this dimension in column 1 or 2 of chart. The dimension in column 3 will be your nominal pipe thread size.
    Column 3 Column 4 Column 5

    OD
    Fraction Inch
    (only for quick reference )

    Actual
    Decimal Inch 0.3125" 0.405" 0.540" 0.675" 0.840" 1.050" 1.315"

    Pipe Size
    Nominal 1/16" 1/8" 1/4" 3/8" 1/2" 3/4" 1"

    TPI
    Threads per Inch

    Normal
    Engagement
    for a tight joint (dimension "C")

    5/16" 13/32" 35/64" 43/64" 27/32" 1-3/64" 1-5/16"

    27 27 18 18 14 14 11-1/2

    0.2611 0.2639 0.4018 0.4078 0.5337 0.5457 0.6828

    1-21/32" 1-29/32" 2-3/8" 2-7/8" 3-1/2" 4" 4-1/2

    1.660" 1.900" 2.375" 2.875" 3.500" 4.000" 4.500"

    1-1/4" 1-1/2" 2" 2-1/2" 3" 3-1/2" 4"

    11-1/2 11-1/2 11-1/2 8 8 8 8

    0.7068 0.7235 0.7565 1.1375 1.2000 1.2500 1.3000

    Two common pipe thread sizes exist, the tapered National Pipe Thread (NPT) and the straight National Standard Free-Fitting Straight Mechanical Pipe Thread (NPSM). The tapered threads are for joining and sealing, the straight threads are only for joining. Dry-seal thread (NPTF) allows for joining without sealants. Female NPT threads may be designated as "FPT" Male NPT threads may be designated as "MPT." The pipe size is often written such as this 1/8"-27, with a hyphen between size & thread per inch, and pronounced as "one eighth twenty-seven" Three less common threads exist, the Garden Hose Thread (GHT), Fire Hose Coupling (NST) and British Standard Taper Pipe Thread (BSPT). The NPT and NPTF threads are interchangeable with sealants such as PTFE tape. None of the other thread standards are interchangeable.

    Definition of pipe thread acronyms


    NPT FPT MPT PTF NPTF National Pipe Thread Female (National) Pipe Thread Male (National) Pipe Thread SAE short tape pipe thread American National taper pipe thread for Dryseal pressure-tight joints

    NPSM American National straight pipe thread for mechanical joints NPSI American National straight intermediate pipe thread

    You might also like