美制螺栓和螺钉公称长度L 公差 ASME/ANSI B 18.2.1 - 2012

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• 

  螺栓的长度公差

  
  

  表1

  公称长度 L	公称规格 d
  	1/4≤d≤3/8	7/16和1/2	9/16≤d≤3/4	7/8和1	1-1/8≤d≤1-1/2	d＞1-1/2
  L≤1	+0.02	+0.02	+0.02	/	/	/
  	-0.03	-0.03	-0.03	/	/	/
  1＜L≤2-1/2	+0.02	+0.04	+0.06	+0.08	+0.12	+0.18
  	-0.04	-0.06	-0.08	-0.10	-0.12	-0.18
  2-1/2＜L≤4	+0.04	+0.06	+0.08	+0.10	+0.16	+0.20
  	-0.06	-0.08	-0.10	-0.14	-0.16	-0.20
  4＜L≤6	+0.06	+0.08	+0.10	+0.12	+0.18	+0.22
  	-0.10	-0.10	-0.10	-0.16	-0.18	-0.22
  L＞6	+0.10	+0.12	+0.14	+0.16	+0.22	+0.24
  	-0.18	-0.18	-0.18	-0.20	-0.22	-0.24

  
  
• 

  螺钉的长度公差

  
  

  表2

  公称长度 L	公称规格 d
  	1/4≤d≤3/8	7/16和1/2	9/16≤d≤3/4	7/8和1	1-1/8≤d≤1-1/2	d＞1-1/2
  L≤1	+0.00	+0.00	+0.00	/	/	/
  	-0.03	-0.03	-0.03	/	/	/
  1＜L≤2-1/2	+0.00	+0.00	+0.00	+0.00	+0.00	+0.00
  	-0.04	-0.06	-0.08	-0.10	-0.12	-0.18
  2-1/2＜L≤4	+0.00	+0.00	+0.00	+0.00	+0.00	+0.00
  	-0.06	-0.08	-0.10	-0.14	-0.16	-0.20
  4＜L≤6	+0.00	+0.00	+0.00	+0.00	+0.00	+0.00
  	-0.10	-0.10	-0.10	-0.16	-0.18	-0.22
  L＞6	+0.00	+0.00	+0.00	+0.00	+0.00	+0.00
  	-0.18	-0.18	-0.18	-0.20	-0.22	-0.24