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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. For example 1/4″, 3/4″, 1 1/4″. Below 1/4″ the diameters are given by a series of numbers from #0 to #12. Each “number” describes an arbitrary diameter as shown in the below table.
Aug 22, 2023 · Anything less than ¼” will be labeled from #0 to #12. #0 has an outside diameter of 0.06 inches, while #12 has an outside diameter of 0.216 inches. After #12, the gauge size is labeled according to the outside diameter. If the screw has an outside diameter of 0.25 inches, the gauge size will be ¼”, and so on.
The following chart converts US screw sizes to their decimal (inch) and metric (millimeter) equivalents, as well as the nearest fractional size. Screw Size. Inch Decimal. Nearest Fraction. Metric Equivalent. #0. 0.060 in. 1/16". 1.52 mm.
ANSI/ ASME EXTERNAL 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). Note: This screw chart is not comprehensive of all available standard threads as provided by the standard.
Screw SizeClass ThreadMajor Diameter(basica)Major Diameter(max.)2 - 62A2.00001.99711-3/4-52A1.75001.74731-1/2-122A1.50001.49811-1/2-62A1.50001.4976Screw Sizes & Threads. The following provides a comprehenisve table showing the equivalant measurements in inches (fractions & decimals) and millimeters for various screw sizes. The second table provides the number of threads per inch for coarse (UNC) and fine (UNF) threads for various size screws and bolts. The first number is the diameter of ...
The basic dimensions are nominal dimensions of a metric thread profile without allowance and tolerances (The thread class defines that). They are based on standard ISO 68-1. The basic dimensions can be used for design. However, for manufacturing and machining, you need the allowable range of each dimension.
Apr 4, 2020 · The imperial diameter (in 16th of an inch) of the screw head is twice the gauge (imperial). The formula below can be used to calculate an estimate of the screw head sizes and the gauge. Gauge= (Head diameter in sixteenths of an inch X 2 ) – 2. E.g. 5/16 head times two equals 10, minus two equals 8. The Gauge is 8.
