BSI - BS 1580-3
Unified Screw Threads Part 3: Diameters Below Quarter of an Inch
|Publication Date:||11 August 1965|
|ICS Code (Inch screw threads):||21.040.20|
Basic sizes, tolerances, allowances and limiting sizes for Unified screw threads from Number 0 (0.060 in diameter) to Number 12 (0.216 in diameter) for Unified fine threads, Number 1 (0.073 in diameter) to Number 12 for Unified coarse threads and Number 12 for the Unified extra fine thread.