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【3/16 1/4 5/16 3/8 7/16】304 Stainless Steel Imperial Hex Socket Screws and American Standard Bolts

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3/16 1/4 304不锈钢英制内六角螺丝美制螺钉 3/16-24牙 1/4-20牙

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DIN934-1

对公差特别在意者慎拍,实物为准。

单位:mm
规格 牙数 dk ≈ K ≈
3/16 24 7.8 4.5
1/4 20 9.5 6
5/16 18 10.9 7.9
1/8 40 5.5 3
5/32 32 6.2 3.8
7/16 14 15.6 11
1/2 12(13) 19 12.5
5/8 11 22 15.5
3/8 16 14 9.4
10# 32 7.7 5
8# 32 6.7 4.2
6# 32 5.5 3.5
4# 40 4.5 2.7
2# 56 3.6 2
0# 80 2.6 1.5

公制英制螺纹牙距表

公制 牙距 英制
美制
称呼 牙数
粗牙 细牙 极细牙 粗牙 细牙 韦氏牙
M3 0.5 0.35   4# 1.9 40 48  
M4 0.7 0.5   6# 3.5 32 40  
M5 0.8 0.5   8# 4.2 32 36  
M6 1.0 0.75   10# 4.8 24 32  
M7 1 0.75   12# 5.5 24 28  
M8 1.25 1.0 0.75 1/4 6.35 20 28 20
M10 1.5 1.25 1.0 5/16 7.94 18 24 18
M12 1.75 1.5 1.25 3/8 9.53 16 24 16
M14 2.0 1.5 1.0 7/16 11.11 14 20 14
M16 2.0 1.5 1.0 1/2 12.7 13 20 12
M18 2.5 2.0 1.5 9/16 14.29 12 18 12
M20 2.5 2.0 1.5 5/8 15.86 11 18 11
M22 2.5 2.0 1.5 3/4 19.05 10 16 10
M24 3.0 2.0 1.5 7/8 22.23 9 14 9
M27 3.0 2.0 1.5 1 25.4 8 12 8
M30 3.5 3.0 2.0          

公制英制螺纹牙距表

公制 牙距 英制
美制
称呼 牙数
粗牙 细牙 极细牙 粗牙 细牙 韦氏牙
M3 0.5 0.35   4# 1.9 40 48  
M4 0.7 0.5   6# 3.5 32 40  
M5 0.8 0.5   8# 4.2 32 36  
M6 1.0 0.75   10# 4.8 24 32  
M7 1 0.75   12# 5.5 24 28  
M8 1.25 1.0 0.75 1/4 6.35 20 28 20
M10 1.5 1.25 1.0 5/16 7.94 18 24 18
M12 1.75 1.5 1.25 3/8 9.53 16 24 16
M14 2.0 1.5 1.0 7/16 11.11 14 20 14
M16 2.0 1.5 1.0 1/2 12.7 13 20 12
M18 2.5 2.0 1.5 9/16 14.29 12 18 12
M20 2.5 2.0 1.5 5/8 15.86 11 18 11
M22 2.5 2.0 1.5 3/4 19.05 10 16 10
M24 3.0 2.0 1.5 7/8 22.23 9 14 9
M27 3.0 2.0 1.5 1 25.4 8 12 8
M30 3.5 3.0 2.0          



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化学成分,%,max
组别CSiMnPSCrMoNiCu特性
304-A20.1120.050.0315-20 8-194

加工硬化率适中,适于一般的冷间加工以及伸抽,冷加工性能较好,普遍用于外六角螺钉、螺母以及垫圈产品

316-A40.08120.0450.0316-18.52-310-151

加钼,耐腐蚀能力较304强,特别适用于海水及化学介质,更加的耐腐蚀性及耐孔蚀性。

注:

1)如镍含量低于8%,则锰的含量必须为5%
2)镍含量大于8%时,对铜的含量不予限制
3)如铬含量低于17%时,则镍的含量为12%
4)对于含碳量0.03%的奥氏体不锈钢,氮含量可达到0.22
5)对较大直径的产品,为达到规定的机械性能,在制造者说明书中,可能有较高的含碳量,但对马氏体钢不应超过0.12%

机械性能
类别组别性能等级螺丝直径抗拉强度mpa/mm2规定非比列伸长应为mpa/mm2断后伸长量mpa/mm2
奥氏体A2,A450

≤ 39

5002100.6d
70

≤ 24

7004500.4d
80

≤ 24

8006000.3d

问题1

1.不锈钢为什么也会带磁性?

304不锈钢属于奥氏体不锈钢,奥氏体在冷加工过程中有部分或少量转化为马氏体
,马氏体是带磁性的,所以304不锈钢为无磁性或者微磁性。具体可以百度查询304不锈钢为什么含磁性。

问题2

2.如何识别正宗304不锈钢产品?

①支持304不锈钢专用检测药水检测,如果不变色为正宗304不锈钢。304药水小标-1
②支持化学成分分析光谱分析。激光药水小标-1
③支持烟雾测试,模拟实际使用环境。

问题3

3.常用不锈钢有那几种?

①.201不锈钢,适合在干燥环境中使用,遇水很容易水生锈。
②304不锈钢,室外或潮湿环境,耐腐蚀耐酸性强。
③316不锈钢,加钼,更加的耐腐蚀性及耐孔蚀性,特别适用于海水及化学介质。

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