1 4 28 Unf Thread. UNC and UNF Thread Chart PDF (Dimensions, Diameter, Size in MM/INCH) Below 1/4″ the diameters are given by a series of numbers from #0 to #12 Note: This screw chart is not comprehensive of all available standard threads as provided by the standard.
What are screw thread sizes? Essentra Components US from www.essentracomponents.com
THREAD PITCH CHART (UNC / UNF / UNEF / UN) Thread pitch chart for UNC, UNF, UNEF and UN up to 2 inch according to ASME B1.1 1.0583: 28: 0.035714 0.9071: 32: 0.031250 0.7938 #16
What are screw thread sizes? Essentra Components US
Supplements: Thread calculators and charts; ASME UN screw thread calculator; Reference: ASME B1.1-2003, Unified Inch Screw Threads (UN and UNR Thread Form) Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! UNC - Unified National Coarse Thread - comparable with the ISO metric thread 28: 32-----UNC: UNF: UNEF: 1/4: 5/16--0.3125: 18: 24: 32-----20: 28: UNEF: 5/16: 3/8--0.3750: 16: 24: 32-----UNC: 20: 28: UNEF: 3/8: 7/16--0.4375: 14: 20: 28-----16.
1/4"28 UNF Fine Thread Stainless Steel Allen Hex Socket Head Cap Screws Bolts eBay. For the UNC version, the 1/4″ bolt will have 20 threads per inch, and you would use a tap drill that is approximately 5.35 mm in diameter Each "number" describes an arbitrary diameter as shown in the below table
Standard Thread Chart PDF. The standard thread pitch is approximately 1 / 4 of the major diameter 28: 32-----UNC: UNF: UNEF: 1/4: 5/16--0.3125: 18: 24: 32-----20: 28: UNEF: 5/16: 3/8--0.3750: 16: 24: 32-----UNC: 20: 28: UNEF: 3/8: 7/16--0.4375: 14: 20: 28-----16.