美制内外螺纹资料.xls

文档介绍：External Thread /Internal Thread a For Class 2A threads with coating (plating) the max. is increased by the allowance, to the basic size. This is the same value as Class 3A. b For uncoated hot - rolled, but not standard fasteners with cold rolled threads c UN series external thread, =Basic - Allowance, for Class 1A and 2A =Basic for Class 3A Nominal Size, TPI, Series Cla ss Allowance Max aMajor Min Major Min bMax aPitch Min Pitch UNR cMinor Dia Max Minor Min Minor Major Dia(Min) Ext. 0- 80 UNF - Int. Ext. 0- 80 UNF - Int. Ext. 1- 64 UNC - Int. Ext. 1- 64 UNC - Int. Ext. 1- 72 UNF - Int. Ext. 1- 72 UNF - Int. Ext. 2- 56 UNC - Int. Ext. 2- 56 UNC - Int. Ext. 2- 64 UNF - Int. Ext. 2- 64 UNF - Int. Ext. 3- 48 UNC - Int. Ext. 3- 48 UNC - Int. Ext. 3- 56 UNF - 陈拓延 2004 共49页第 1页 Nominal Size, TPI, Series Cla ss Allowance Max aMajor Min Major Min bMax aPitch Min Pitch UNR cMinor Dia Max Minor Min Minor Major Dia(Min) Int. Ext. 3- 56 UNF - Int. Ext. 4- 40 UNC - Int.