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Threaded Pitch Chart

Instead of the use of a thread count, a thread pitch is used to specify metric fasteners and that is why there is a big need for Thread Pitch Chart. Thread pitch chart PDF and metric thread pitch chart PDF reveal very clearly, the basic steps that are involved in the identification of a thread. Threads per inch chart and external thread chart give information that is extremely useful to identify almost all of the external (male) threads, from the 3 famous thread identification systems in the world today, namely, the British (inch) standards, U.S.A. (inch) standards and metric standards.

The thread pitch is calculated in millimeters and it is the distance between threads, this can be easily calculated with the use of a thread pitch calculator. If there is a thread pitch of 2, this would indicate that the distance between the two threads is 2 mm. Bolt thread size chart covers all kinds of information in it, such as nominal size and threads per inch, basic pitch diameter and tensile stress area.

By using a Thread Gauge, it is possible to measure a thread pitch or a thread count and an even better way of measuring this is by making use of a metric thread pitch chart. A Thread Gauge is also called a Pitch Gauge or a Screw Gauge. In order to be able to use a Thread Gauge, it is first important to match the thread type with the gauge. Thread Pitch Chart will detail all kinds of diagrams, specifications and helpful information, pertaining to various kinds of threads.

Thread series cover designations of diameter/pitch combinations that are measured by the number of threads per inch (TPI) applied to a single diameter.

Coarse Thread Series (UNC/UNRC) is the most common designation for general application bolts and nuts. Coarse thread is beneficial, because they are less likely to cross thread, more tolerant in adverse conditions and facilitate quick assembly.

Fine Thread Series (UNF/UNRF) is commonly used in precision applications. Because of the larger tensile stress areas, they have high tension strength. However, a longer engagement is required for fine thread applications than for coarse series threads to prevent stripping.

8 – Thread Series (8UN) is the specified thread forming method for several ASTM standards including A193 B7, A193 B8/B8M, and A320. This series is used for diameters one inch and above.

 

Coarse Thread Series - UNC Fine Thread Series - UNF 8-Thread Series - 8UN
Nominal Size and Threads Per In. Basic Pitch Dia. Section at Minor Dia. Tensile Stress Area Nominal Size and Threads Per In. Basic Pitch Dia. Section at Minor Dia. Tensile Stress Area Nominal Size and Threads Per In. Basic Pitch Dia. Section at Minor Dia. Tensile Stress Area
In. Sq in. Sq in. In. Sq in. Sq in. In. Sq in. Sq in.
3⁄8 - 160.33440.06780.07753⁄8 - 240.34790.08090.0878--    --------
7⁄16 - 140.39110.09330.10637⁄16 - 200.40500.10900.1187--    --------
1⁄2 - 130.45000.12570.14191⁄2 - 200.46750.14860.1599--    --------
9⁄16 - 120.50840.1620.1829⁄16 - 180.52640.1890.203--    --------
5⁄8 - 110.56600.2020.2265⁄8 - 180.58890.2400.256--    --------
3⁄4 - 100.68500.3020.3343⁄4 - 160.70940.3510.373--    --------
7⁄8 - 90.80280.4190.4627⁄8 - 140.82860.4800.509--    --------
1 - 80.91880.5510.6061 - 120.94590.6250.6631 - 80.91880.5510.606
11⁄8 - 71.03220.6930.76311⁄8 - 121.07090.8120.85611⁄8 - 81.04380.7280.790
11⁄4 - 71.15720.8900.96911⁄4 - 121.19591.0241.07311⁄4 - 81.16880.9291.000
13⁄8 - 61.26671.0541.15513⁄8 - 121.32091.2601.31513⁄8 - 81.29381.1551.233
11⁄2 - 61.39171.2941.40511⁄2 - 121.44591.5211.58111⁄2 - 81.41881.4051.492
--    ----------    --------15⁄8 - 81.54381.681.78
13⁄4 - 51.62011.741.90--    --------13⁄4 - 81.66881.982.08
--    ----------    --------17⁄8 - 81.79382.302.41
2 - 41⁄21.85572.302.50--    --------2 - 81.91882.652.77
21⁄4 - 41⁄22.10573.023.25--    --------21⁄4 - 82.16883.423.56
21⁄2 - 42.33763.724.00--    --------21⁄2 - 82.41884.294.44
23⁄4 - 42.58764.624.93--    --------23⁄4 - 82.66885.265.43
3 - 42.83765.625.97--    --------3 - 82.91886.326.51
31⁄4 - 43.08766.727.10--    --------31⁄4 - 83.16887.497.69
31⁄2 - 43.33767.928.33--    --------31⁄2 - 83.41888.758.96
33⁄4 - 43.58769.219.66--    --------33⁄4 - 83.668810.1110.34
4 - 43.837610.6111.08--    --------4 - 83.918811.5711.8