Machine Screw Diameters Chart and Unified National Thread Sizes

Thread Pitch Charts

Bolt Size Chart, UNF Bolts, UNC Bolts

Thread Chart (Metric) Major and Minor Diameters

Screws

Understanding Metric and Inch Thread Sizes in Fasteners

About Machine Screws and Nuts – Sizes and Key Dimensions

Unified Threads (UNC/UNF/UNEF): Dimensions & Formulas

About Machine Screws and Nuts – Sizes and Key Dimensions

Everything you wanted to know about taps but were afraid to ask, styles of taps, class of thread , gh numbers , basic point in thread measurement , constants for finding pitch