This part of BS 1580 specifies limits of sizes, and tolerances, for single-start, clearance-fit unified screw threads, in inch units with diameters 1/4 below in. This part of BS 1580 specifies unified screw threads from Number 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 inch diameter/pitch combination. NOTE Unified screw threads below 1/4 in diameter for attachment purposes and for general use in the aircraft industry are specified in Annex A.
BS 1580-3-2007由英国标准学会 GB-BSI 发布于 2007-12-31,并于 2007-12-31 实施。
BS 1580-3-2007 在中国标准分类中归属于: J04 基础标准与通用方法,在国际标准分类中归属于: 21.040.20 英制螺纹。
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