Basic thread dimensions (pitch, minor & major diameters, depth, lead), tolerance range for all applicable classes and much more Quick thread screw calculator chart This screw chart is not comprehensive of all available standard threads as provided by the standard Ansi external screw threads size chart Helicoil | helicoil drill sizes | helicoil drill chart | helicoil specs | helicoil data | helicoil inserts | helicoil screw thread inserts | helicoil thread repair kits | helicoil tools | recoil Unified threads comes in three different classes
Unc threads according ansi b1.1 Pitch is the distance between screw grooves and is commonly used with inch sized products and specified as threads per inch. Unc thread chart per asme b1.1 External and internal unified coarse thread dimensions — major, pitch, and minor diameters (inch). The new term unc is comparable with the iso metric thread Nc and unc threads are interchangeable, in an analogous manner like the metric and the iso metric thread
Classes 1a, 2a, and 3a apply to external threads only, and classes 1b, 2b, and 3b apply to internal threads only Allowance is specified only for classes 1a and 2a and the allowance is identical for both classes.
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