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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.
UNC thread chart including major diameter, pitch diameter and minor diameter dimensions of UNC screw threads according to ASME B1.1 standard.
ANSI/ ASME INTERNAL Screw Thread Size Chart. All units are in inches. Unified Screw Threads per. ANSI/ASME B1.1-1989 (R2001), R2001) Nomenclature, are used. Acceptability criteria are described in ANSI/ASME B1.3M-1992 (R2001).
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
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.
13 lut 2015 · Minor diameter: The maximum and minimum sizes of the smallest diameter of the screw threads. Over wires distance: these are the maximum and minimum distances if using 3 wires of the same size to measure the dimension close to the pitch diameter of an external thread.
4 lis 2012 · UNF – Unified National Fine Thread. Female and Male UNC/UNF threads are both parallel. The UNC/UNF flank angle is 60°. Unified threads comes in three different classes: for applications where a liberal tolerance is required to permit easy assembly even with slightly nicked threads.
