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Unified Screw Threads (UNC/UNF/UNEF): Charts & Formulas
Thread Pitch: Comprehensive Thread Size Chart and Pitch Guide
Thread Pitch Chart - Portland Bolt
All Thread Rods - McMaster-Carr
1"-14 Fully-Threaded Rods & Studs - Grainger Industrial Supply
Standard Thread Pitch Chart - All-Pro Threaded
Thread Pitch Chart - wermac.org