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精制美制六角头螺钉 BS 1768 - 1963

选择规格尺寸点击↓

1/4

5/16

3/8

7/16

1/2

(9/16)

5/8

3/4

7/8

1-1/8

1-1/4

(1-3/8)

1-1/2

1-3/4

括号内尺寸为非优选

尺寸单位: inch

英标BS 1768 - 1963 BS1768 1768BS 精制美制六角头螺钉

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单重计算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

1/4

5/16

3/8

7/16

1/2

(9/16)

5/8

3/4

PP	UNC
	UNF
d_a	最大值
	最小值
s	最大值
	最小值
e	最大值
d_w	最大值
	最小值
k	最大值
	最小值
r	最大值
	最小值

20	18	16	14	13	12	11	10
28	24	24	20	20	18	18	16
0.2500	0.3125	0.3750	0.4375	0.5000	0.5625	0.6250	0.7500
0.2465	0.3090	0.3715	0.4335	0.4960	0.5585	0.6190	0.7440
0.4375	0.5000	0.5625	0.6250	0.7500	0.8125	0.9375	1.1250
0.4305	0.4930	0.5545	0.6170	0.7420	0.8045	0.9295	1.1150
0.505	0.577	0.650	0.722	0.866	0.938	1.083	1.300
0.421	0.483	0.545	0.605	0.730	0.792	0.918	1.100
0.411	0.473	0.535	0.595	0.720	0.782	0.908	1.090
0.163	0.211	0.243	0.291	0.323	0.371	0.403	0.483
0.153	0.201	0.233	0.281	0.313	0.361	0.393	0.463
0.025	0.025	0.025	0.025	0.025	0.045	0.045	0.045
0.015	0.015	0.015	0.015	0.015	0.020	0.020	0.020

螺纹尺寸
d

7/8

1-1/8

1-1/4

(1-3/8)

1-1/2

1-3/4

PP	UNC
	UNF
d_a	最大值
	最小值
s	最大值
	最小值
e	最大值
d_w	最大值
	最小值
k	最大值
	最小值
r	最大值
	最小值

9	8	7	7	6	6	5	4-1/2
14	12	/	/	/	/	/	/
0.8750	1.0000	1.1250	1.2500	1.3750	1.5000	1.7500	2.0000
0.8670	0.9920	1.1170	1.2420	1.3650	1.4900	1.7400	1.9900
1.3125	1.5000	1.6875	1.8750	2.0625	2.2500	2.6250	3.0000
1.3005	1.4880	1.6575	1.8300	2.0175	2.2050	2.5650	2.9400
1.515	1.732	1.948	2.165	2.382	2.598	3.031	3.464
1.285	1.473	1.641	1.813	2.001	2.188	2.543	2.918
1.275	1.463	1.625	1.797	1.985	2.172	2.527	2.902
0.563	0.627	0.718	0.813	0.878	0.974	1.134	1.263
0.543	0.597	0.678	0.773	0.838	0.934	1.074	1.203
0.065	0.095	0.095	0.095	0.095	0.095	0.095	0.095
0.040	0.060	0.060	0.060	0.060	0.060	0.060	0.060

①,当 d ≤ 1 inch 时, a ≤ 2.5P ;
当 d ＞1 inch 时, a ≤ 3.5P .

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 12603 - 2005

金属热处理工艺分类及代号

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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