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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. It is also allowed to denote the diameters with a decimal value. For example 0.250 (1/4″), 0.4375 (7/16″), etc. By default, the pitch is given in TPI.
23 Φεβ 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!
UNFThreadChart(UnifiedInchScrewFineThreadDimensions,Sizes,Diameters) Thread(in) Threads per inch (tpi) MajorDiameter MinorDiameter Tap Drill Size (mm)
General Note: All dimensions expressed in inches. Supplements: Thread calculators and charts; ASME UN screw thread calculator; Reference: ASME B1.1-2003, Unified Inch Screw Threads (UN and UNR Thread Form) Oberg, E. , Jones ,F.D. , Horton H.L. , Ryffel H.H., (2016) . Machinery's Handbook. 30th edition. Industrial Press Inc.
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Threads per Inch and Series Designation Class Allowance Minor Diameter Class Pitch Diameter; Max (d) Min Min Max; 1/4" - 20UNC: 1A: 0.0011: 5.497: 5.354: 1B: 5.525: 5.71: 5/16" - 18UNC: 1A: ... UNF Pitch Diameter Chart. Nominal Size External (b) Internal (b) Threads per Inch and Series Designation Class Allowance Minor Diameter Class Pitch ...
Thread pitch chart for UNC, UNF, UNEF and UN up to 2 inch according to ASME B1.1.