螺纹(强烈推荐).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 Class Allowance Maxa Major Min Major Min b Maxa Pitch Min Pitch UNRc Minor Dia
Max Minor Min Minor Major Dia(Min)
Ext. 0-80 UNF 2A -
Int. 2B 0
Ext. 0-80 UNF 3A 0 -
Int. 3B 0
Ext. 1-64 UNC 2A -
Int. 2B 0
Ext. 1-64 UNC 3A 0 -
Int. 3B 0
Ext. 1-72 UNF 2A -
Int. 2B 0
Ext. 1-72 UNF 3A 0 -
Int. 3B 0
Ext. 2-56 UNC 2A -
Int. 2B 0
Ext. 2-56 UNC 3A 0 -
Int. 3B 0
Ext. 2-64 UNF 2A -
Int. 2B 0
Ext. 2-64 UNF 3A 0 -
Int. 3B 0
Ext. 3-48 UNC 2A -
Int. 2B 0
Ext. 3-48 UNC 3A 0 -
Int. 3B 0
Ext. 3-56 UNF 2A -
Int. 2B 0
Ext. 3-56 UNF 3A 0 -
Int. 3B 0
Ext. 4-40 UNC 2A -
Int. 2B 0
Ext. 4-40 UNC 3A 0