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内六角凹端紧定螺钉 [Type B] (ASTM F912 / F880) ASME B 18.3 (T14 CUP-B) - 2012

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10#

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5/16

3/8

7/16

1/2

5/8

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7/8

1-1/8

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ASME B 18.3 (T14 CUP-B) - 2012 内六角凹端紧定螺钉 [Type B] (ASTM F912 / F880)

尺寸单位: inch

美标ASME B18.3 (T14 CUP-B) - 2012 ASME18.3 内六角凹端紧定螺钉 [Type B] (ASTM F912 / F880)

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公差美制螺纹极限尺寸米/英制螺纹对照螺纹直径与受力截面积最小破坏扭矩牌号等级

螺纹尺寸
d

10#

1/4

5/16

3/8

d	螺纹直径
PP	粗牙/UNC
	细牙/UNF
	超细牙/UNEF
s	公称
t ^③	最小值
d_z	最大值
d_z	最小值
L₀ ^②

0.0600	0.0730	0.0860	0.0990	0.1120	0.1250	0.1380	0.1640	0.1900	0.2500	0.3125	0.3750
-	64.0	56.0	48.0	40.0	40.0	32.0	32.0	24.0	20.0	18.0	16.0
80.0	72.0	64.0	56.0	48.0	44.0	40.0	36.0	32.0	28.0	24.0	24.0
-	-	-	-	-	-	-	-	-	32.0	32.0	32.0
0.028	0.035	0.035	0.050	0.050	0.062	0.062	0.078	0.094	0.125	0.156	0.188
0.050	0.060	0.060	0.070	0.070	0.080	0.080	0.090	0.100	0.125	0.156	0.188
0.032	0.038	0.043	0.050	0.056	0.062	0.069	0.082	0.095	0.125	0.156	0.187
0.027	0.033	0.038	0.045	0.051	0.056	0.062	0.074	0.086	0.114	0.144	0.174
0.13	0.13	0.13	0.19	0.19	0.19	0.19	0.19	0.19	0.25	0.31	0.38

螺纹尺寸
d

7/16

1/2

5/8

3/4

7/8

1-1/8

1-1/4

1-3/8

1-1/2

1-3/4

d	螺纹直径
PP	粗牙/UNC
	细牙/UNF
	超细牙/UNEF
s	公称
t ^③	最小值
d_z	最大值
d_z	最小值
L₀ ^②

0.4375	0.5000	0.6250	0.7500	0.8750	1.0000	1.1250	1.2500	1.3750	1.5000	1.7500	2.0000
14.0	13.0	11.0	10.0	9.0	8.0	7.0	7.0	6.0	6.0	5.0	4.5
20.0	20.0	18.0	16.0	14.0	12.0	12.0	12.0	12.0	12.0	-	-
28.0	28.0	24.0	20.0	20.0	20.0	18.0	18.0	18.0	18.0	-	-
0.219	0.250	0.312	0.375	0.500	0.562	0.562	0.625	0.625	0.750	1.000	1.000
0.219	0.250	0.312	0.375	0.500	0.562	0.562	0.625	0.625	0.750	1.000	1.000
0.218	0.250	0.312	0.375	0.437	0.500	0.562	0.625	0.687	0.750	0.875	1.000
0.204	0.235	0.295	0.357	0.418	0.480	0.542	0.605	0.667	0.730	0.855	0.980
0.44	0.5	0.63	0.75	0.88	1	1.25	1.25	1.5	1.5	1.75	2

①,材料
a、合金钢应符合ASTM F912
b、不锈钢应符合ASTM F880
②,当螺钉长度L小于等于表中L0时为短螺钉，若L大于L0则为长螺钉。
③,表中的内凹槽插入深度t适用于公称长度L大于等于表中L0的螺钉，其他情况详见标准原件。
④,表中规定的短螺钉在进行紧固时，往往发生因内板拧插入深度不够或螺纹长度不甚理想，而出现的扳拧或螺纹配合上的故障。所以特别提示生产者和用户，在可能的情况下，都应尽可能采用长度大于等于表中L0的螺钉。

引用参考

GB /T 1172 - 1999

黑色金属硬度及强度换算值

GB /T 5267.1 - 2002

镀锌、镀镍、镀镉、复合镀等层镀层盐雾腐蚀的防护性能

GB /T 193 - 2003

普通螺纹（一般用途米制螺纹）- 直径与螺距系列 (ISO 261: 1998, MOD)

GB /T 3106 - 2016

紧固件 - 螺栓、螺钉和螺柱 - 公称长度和螺纹长度 (ISO 888:2012, MOD)

GB /T 3 - 1997

普通螺纹收尾、肩距、退刀槽和倒角 (ISO 3508:1976 / ISO 4755:1983)

GB /T 5779.1 - 2000

紧固件表面缺陷 - 螺栓、螺钉和螺柱 - 一般要求

GB /T 5779.3 - 2000

紧固件表面缺陷 - 螺栓、螺钉和螺柱 - 特殊要求

注：技术数据仅供参考，请以官方原件为准！

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