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1/4 - 20 UNC : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more.
23 lut 2024 · We provide an accurate UNC and UNF Thread Chart PDF for your reference and download, so that you can quickly understand the dimensions (size in mm) and specifications of UNC/UNF threads!
Basic designation syntax: Nominal Diameter in Inch Fraction. Pitch in TPI. Series: UNC / UNF / UNEF / UN. Class: 1A, 2A, 3A, 1B, 2B or 3B. Diameter: From 1/4″ and above the diameters are given in inch fractions.
Minor Diameter Pitch Diameter Major Dia-meter ... 1/4-20 UNC 0.0011 0.1960 0.2070 0.2175 0.2224 0.0049 0.2500. NUTS WWW.AMERICANFASTENER.COM – 724 444 6940 – 1 800 466 9780 INTERNAL THREADS – CLASS 2B ... 3 1/2-4 UNC 0.0033 3.2290 3.2670 3.3376 3.3519 0.0143 3.5000
UNC thread chart including major diameter, pitch diameter and minor diameter dimensions of UNC screw threads according to ASME B1.1 standard.
1-20 UNEF 0.050000 0.9460 0.9570 0.9536 0.9675 0.9734 0.9719 0.9545 0.9513 0.9779 0.9762 1.1/16-8 UN 0.125000 0.9270 0.9520 0.9422 0.9813 0.9902 0.9880 0.9488 0.9407 1.0073 1.0030 Thread Series Pitch or Minor Dia Minor Dia Pitch Dia Pitch Dia 70% Thread Engagement Thread Series Pitch or in/Rev Minor Dia Minor Dia Max (3B) Pitch Dia Pitch Dia ...
External Thread Dimensions for Unified UNC Screw Threads Diameter Pitch ... Major Diameter Pitch Diameter Minor Diameter Stress Area Max Min Max Min Max Min in² No 1 64 2A 0.0724 0.0686 0.0623 0.0603 0.0538 0.00263 No 2 56 2A 0.0854 0.0813 0.0738 0.0717 0.0642 0.00370 ... 1/4” 20 2A 0.2489 0.2408 0.2164 0.2127 0.1894 0.03180
