各种螺纹加工中径表详表.doc

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1、螺纹规格大径d/mm中径d2/mm公差带及尺寸加工中径尺寸及公差备注公差带尺寸/mmM8x1.2587.1886g-0.0197.09±0.02-0.086M12x1.51211.0266g-0.03210.90±0.02-0.172M14x1.51413.0266g-0.03212.90±0.02-0.172M16x1.51615.0266g-0.03214.90±0.02-0.172M18x1.51817.0266g-0.03216.90±0.02-0.172M20x1.52019.0266g-0.03218.90±0.02-0.172M22x1.5222

2、1.0266g-0.03220.87±0.02-0.172M24x1.52423.0266g-0.03222.87±0.02-0.182M26x1.52625.0266g-0.03224.90±0.02-0.182M28x1.52827.0266g-0.03226.90±0.02-0.182M30x1.53029.0266g-0.03228.90±0.02-0.182M36x1.53635.0266g-0.03234.90±0.02-0.1826h034.92±0.02-0.150M38x1.53837.0266g-0.03236.90±0.02-0.182M

3、40x1.54039.0266g-0.03238.90±0.02-0.182表五:普通外螺纹(M)基本尺寸表(摘自GB/T196-1981)部分螺纹说明:1.公制螺纹M的牙型角60°,螺纹标记代号:M30x2左-6g,右旋和粗牙螺距不用标明,常用计算公式如下:H=0.P,D2=d2=D-0.P,D1=d1=D-1.P;编制/日期:审核/日期:螺纹规格螺纹等级大径/mm中径/mm产品加工中径/mm备注最大最小最大最小3/8"-24UNF2A9.4979.3148.8098.7128.75±0.027/16"-20UNF2A11.07910.87410.25410

4、.14710.18±0.021/2"-20UNF2A12.66712.46111.84111.73211.75±0.029/16"-18UNF2A14.25214.03113.33513.22113.25±0.025/8"-18UNF2A15.84015.61814.92314.80314.82±0.025/8"-24UNEF2A15.84515.66215.15615.05515.05±0.023/4"-16UNF2A19.01218.77317.98117.85417.85±0.027/8"-14UNF2A22.18421.92321.00620.8692

5、0.88±0.021"1/16-12UN2A26.94426.65525.57025.42525.45±0.0251"1/4-12UNF2A31.70431.41530.33030.17330.20±0.031"5/16-12UN2A33.28233.00531.92031.77331.82±0.031"5/8-12UN2A41.22940.94039.85539.70539.80±0.032"-12UN2A50.75450.46549.38049.2252"1/2-12UN2A63.45263.16262.07861.920表四:美制圆柱外螺纹基本尺寸表部分

6、螺纹说明:1.美制螺纹的牙型角60°,螺纹标记代号:3/8"-24UNF(UN/UNEF/UNC)-3A,右旋和2A等级螺纹不用标明;2.常用计算公式如下:P=25.4/n,H=0.P,D2=d2=D-0.P,D1=d1=D-1.P;3.螺纹2"-12UN和2"1/2-12UN,挑丝,大径尺寸-0.15至-0.25;编制/日期:审核/日期: