標準號：BS 84-2007
中文標準名稱：惠氏螺紋牙樣的平行螺紋.要求
英文標準名稱：Parallel screw threads of Whitworth form – Requirements
標準類型：J05
發布日期：2007/11/30 12:00:00
實施日期：2007/11/30 12:00:00
中國標準分類號：J05
國際標準分類號：21.040.20
引用標準：BS 919-2;BS 6528-1984
適用范圍：This British Standard specifies limits of sizes, and tolerances, for singlestart parallel screw threads of Whitworth form, for general engineeringuse. It is not applicable to threads for threaded pipe joints, screwthreads associated with interference fits, such as those on the “metalends” of studs and in the corresponding tapped holes, or to screwthreads which are to be subjected to high temperatures.This standard specifies the following thread series:a) a coarse thread series, the British Standard Whitworth (B.S.W.)series, with nominal diameters in the range in to 6 in.b) a fine thread series, the British Standard fine (B.S.F.) series, withnominal diameters in the range in to 4 in.NOTE The tables of limits and tolerances for the B.S.F. series extendup to the 3 in size only, since nominal sizes above 3 in are rarely used.c) a supplementary selected thread (WHIT. S.) series with nominaldiameters from in to 7 in.d) a truncated Whitworth form series (specified in Annex A).This British Standard specifies limits of sizes, and tolerances, ofuncoated threads and also for metal coated threads (including threadscoated with nickel, tin or zinc) with a thickness of coating of the orderof 0.000 2 in. It is not applicable to heavily coated threads (i.e. threadswith a coating thickness above 0.000 35 in).NOTE Supplementary information is given in Annex B, Annex C andAnnex D.