圈上大峰 Power Screw Example-Solution (b) Thread depth p/2=4/2=2 mm Thread width p/2=4/2=2 mm Mean (pitch)diameter d-p/2=32-4/2 =30 mm Minor diameter d-p=32-4=28 mm Lead 2*p (double threads)=2*4=8 mm 圈上大峰 Identification Codes2 .Two major types of identification codes >English units(英制) >Metric units.(公制) .Most fasteners used in the United States, Canada and the United Kingdom is known as >Unified Inch Profile >According to ANSI standards ANSI B1.1-1982. .Europe uses ISO or International Organization for Standardization. 3635 Power Screw Example – Solution Thread depth = p/2 = 4/2 = 2 mm Thread width = p/2 = 4/2 = 2 mm Mean (pitch) diameter = d – p/2 = 32 – 4/2 = 30 mm Minor diameter = d – p = 32 – 4 = 28 mm Lead = 2*p (double threads) = 2*4 = 8 mm 36 Identification Codes2 •Two major types of identification codes English units（英制） Metric units.（公制） •Most fasteners used in the United States, Canada and the United Kingdom is known as Unified Inch Profile According to ANSI standards ANSI B1.1-1982. •Europe uses ISO or International Organization for Standardization