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1、美国板料厚度表示方法。美国计量习惯采用英制,较薄板料的厚度如以英寸作最小单位,其数字很麻烦,所以常用级数(GRADE)表示板料厚度。如:板料厚度级数(GA)对应英寸(inch)对应mm0,000,0000.512.7000,0000.4687511.9062500,0000.437511.11250,0000.4062510.31850000.37529.525000.343758.7312500.31257.937510.281257.1437720.2656256.74687530.256.3540.2343755.95312550.21875.5562560.2031255.519375
2、70.18754.762580.1718754.36562590.156253.96875100.140623.571875110.1253.135120.1093752.778125130.093752.38125140.0781251.984375150.07031251.7859375160.06251.5175170.056251.4287180.051.27常用的有:7GA=4.5mm10GA=3.2mm13GA=2.3mm14GA=2.0mm16GA=1.6mm17GA=1.4mm18GA=1.2mm这是表示厚度的.表示其他的对照不同.11GA=3.0mm12GA=2.7mm(均为厚度表示法)