標準號：BS 1580-3-2007
中文標準名稱：統一標準螺紋.第3部分:直徑小于1/4 in的螺紋.要求
英文標準名稱：Unified screw threads - Part 3:Screw threads with diameters below 1/4 in - Requirements
標準類型：J04
發布日期：2007/12/31 12:00:00
實施日期：2007/12/31 12:00:00
中國標準分類號：J04
國際標準分類號：21.040.20
引用標準：BS 919-1-2007;BS 1580-1-2007;BS 1981;BS 6528-1984
適用范圍：This part of BS 1580 specifies limits of sizes, and tolerances, forsingle-start, clearance-fit unified screw threads, in inch units withdiameters 1/4 below in.This part of BS 1580 specifies unified screw threads fromNumber 0 (0.060 in diameter) to Number 12 (0.216 in diameter),known as the “numbered sizes” in the following standard series:? a coarse thread (UNC) series;? a fine thread (UNF) series;? for Number 12 threads, an extra fine (UNEF) 32 threads per inchdiameter/pitch combination.NOTE Unified screw threads below 1/4 in diameter for attachmentpurposes and for general use in the aircraft industry are specified inAnnex A.