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由有关电镀标准推荐的公称镀层厚度，以及相应的局部厚度和批平均厚度，见表1。
为降低因镀层厚度造成的螺纹装配中产生干涉的风险，镀层厚度不能超过1/4螺纹基本偏差，见表2规定的数值。
注：可容纳的镀层厚度指导值，在资料性附录C中给出。
表1 镀层厚度（单位：微米）
公称镀层厚度 | 有效镀层厚度 | ||
局部厚度a min | 批平均厚度b | ||
min | max | ||
3 | 3 | 3 | 5 |
5 | 5 | 4 | 6 |
8 | 8 | 7 | 10 |
10 | 10 | 9 | 12 |
12 | 12 | 11 | 15 |
15 | 15 | 14 | 18 |
20 | 20 | 18 | 23 |
25 | 25 | 23 | 28 |
30 | 30 | 27 | 35 |
a. 局部厚度不应小于订单中规定的最小厚度，并按镀层标准规定的方法之一进行测量。螺栓、螺钉和螺母厚度测量应在下图所示的度验表面进行。
b. 批平均厚度测量应按规定（见GB5267.1-2002规范性附录D)方法进行。当测量值超过平均厚度最大值时，如果镀后螺纹能用适当的通规（H或h）验收通过，则不应拒收。 注：① 除非另有规定，局部镀层厚度应进行测量。（大部分螺钉和螺栓是批量滚筒电镀，其结果是最大镀层厚度总是在零件末端。这一结果造成长度或螺栓、螺钉的直径增加，按照螺距尺寸规定减小镀层厚度是可以接受的）。 ② 镀层厚度的抽样检查按 GB/T 90.1 规定。 如果螺纹零件公称长度L＞5d，在测量批平均厚度时，就使用小于表1规定的公称镀层厚度，见表2。 | |||
表2 普通螺纹镀层厚度的上偏差值
螺距 P/mm | 粗牙螺纹 的螺纹 公称直径a d/mm | 内螺纹 | 外螺纹 | |||||||||||||||
公差带位置 G | 公差带位置 g | 公差带位置 f | 公差带位置 e | |||||||||||||||
基本偏差 μm | 镀层厚度 μm max | 基本偏差 μm | 镀层厚度/μm max | 基本偏差 μm | 镀层厚度/μm max | 基本偏差 μm | 镀层厚度/μm max | |||||||||||
b | c | b | c | b | c | |||||||||||||
所有 公称 长度 | 公称长度 L/mm | 所有 公称 长度 | 公称长度 L/mm | 所有 公称 长度 | 公称长度 L/mm | |||||||||||||
L≤5d | 5d＜L≤10d | 10d＜L≤15d | L≤5d | 5d＜L≤10d | 10d＜L≤15d | L≤5d | 5d＜L≤10d | 10d＜L≤15d | ||||||||||
0.2 0.25 0.3 |
1、1.2 1.4 | +17 +18 +18 | 3 3 3 | -17 -18 -18 | 3 3 3 | 3 3 3 | 3 3 3 | 3 3 3 |
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0.35 0.4 0.45 | 1.6 (1.8) 2 2.5 (2.2) | +19 +19 +20 | 3 3 3 | -19 -19 -20 | 3 3 5 | 3 3 5 | 3 3 3 | 3 3 3 | -34 -34 -35 | 8 8 8 | 8 8 8 | 5 5 5 | 5 5 5 |
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0.5 0.6 0.7 | 3 3.5 4 | +20 +21 +22 | 5 5 5 | -20 -21 -22 | 5 5 5 | 5 5 5 | 3 3 3 | 3 3 3 | -36 -36 -38 | 8 8 8 | 8 8 8 | 5 5 5 | 5 5 5 | -50 -53 -56 | 12 12 12 | 12 12 12 | 10 10 10 | 8 8 8 |
0.75 0.8 1 | 4.5 5 6 (7) | +22 +24 +26 | 5 5 5 | -22 -24 -26 | 5 5 5 | 5 5 5 | 3 3 3 | 3 3 3 | -38 -38 -40 | 8 8 10 | 8 8 10 | 5 5 8 | 5 5 5 | -56 -60 -60 | 12 15 15 | 12 15 15 | 10 12 12 | 8 10 10 |
1.25 1.5 1.75 | 8 10 12 | +28 +32 +34 | 5 8 8 | -28 -32 -34 | 5 8 8 | 5 8 8 | 5 5 5 | 3 5 5 | -42 -45 -48 | 10 10 12 | 10 10 12 | 8 8 8 | 5 5 5 | -63 -67 -71 | 15 15 15 | 15 15 15 | 12 12 12 | 10 10 10 |
2 2.5
3 | 16 (14) 20 (18、22) 24 (27) | +38 +42
+48 | 8 10
12 | -38 -42
-48 | 8 10
12 | 8 10
12 | 5 8
8 | 5 5
8 | -52 -58
-63 | 12 12
15 | 12 12
15 | 10 10
12 | 8 8
10 | -71 -80
-85 | 15 20
20 | 15 20
20 | 12 15
15 | 10 12 12 |
3.5 4 4.5 | 30 (33) 36 (39) 42 (45) | +53 +60 +63 | 12 15 15 | -53 -60 -63 | 12 15 15 | 12 15 15 | 10 12 12 | 8 10 10 | -70 -75 -80 | 15 15 20 | 15 15 20 | 12 15 15 | 10 12 12 | -90 -95 -100 | 20 20 25 | 20 20 25 | 15 15 20 | 15 15 15 |
5 5.5 6 | 48 (52) 56 (60) 64 | +71 +75 +80 | 15 15 20 | -71 -75 -80 | 15 15 20 | 15 15 20 | 12 15 15 | 10 12 12 | -85 -90 -95 | 20 20 20 | 20 20 20 | 15 15 15 | 12 15 15 | -106 -112 -118 | 25 25 25 | 25 25 25 | 20 20 20 | 15 15 15 |
注：为容纳镀层厚度而特殊制造的螺纹，其更大的基本偏差参见GB/T5267.1-2002表C.1。 | ||||||||||||||||||
a. 提供的粗牙螺距信息仅为方便使用。决定特性的是螺距。 b. 测量局部厚度时，镀层厚度的最大值。 c. 测量批平均厚度时，镀层厚度的最大值。 | ||||||||||||||||||
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