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由有關電鍍标準推薦的公稱鍍層厚度，以及相應的局部厚度和批平均厚度，見表1。
為降低因鍍層厚度造成的螺紋裝配中產生幹涉的風險，鍍層厚度不能超過1/4螺紋基本偏差，見表2規定的數值。
注：可容納的鍍層厚度指導值，在資料性附錄C中給出。
表1 鍍層厚度（單位：微米）
公稱鍍層厚度 | 有效鍍層厚度 | ||
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. 局部厚度不應小于訂單中規定的最小厚度，并按鍍層标準規定的方法之一進行測量。螺栓、螺釘和螺母厚度測量應在下圖所示的度驗表面進行。
b. 批平均厚度測量應按規定（見GB5267.1-2002規範性附錄D)方法進行。當測量值超過平均厚度最大值時，如果鍍後螺紋能用适當的通規（H或h）驗收通過，則不應拒收。 注：① 除非另有規定，局部鍍層厚度應進行測量。（大部分螺釘和螺栓是批量滾筒電鍍，其結果是最大鍍層厚度總是在零件末端。這一結果造成長度或螺栓、螺釘的直徑增加，按照螺距尺寸規定減小鍍層厚度是可以接受的）。 ② 鍍層厚度的抽樣檢查按 GB/T 90.1 規定。 如果螺紋零件公稱長度L＞5d，在測量批平均厚度時，就使用小于表1規定的公稱鍍層厚度，見表2。 | |||
表2 普通螺紋鍍層厚度的上偏差值
螺距 P/mm | 粗牙螺紋 的螺紋 公稱直徑a d/mm | 内螺紋 | 外螺紋 | |||||||||||||||
公差帶位置 G | 公差帶位置 g | 公差帶位置 f | 公差帶位置 e | |||||||||||||||
基本偏差 μm | 鍍層厚度 μm max | 基本偏差 μm | 鍍層厚度/μm max | 基本偏差 μm | 鍍層厚度/μm max | 基本偏差 μm | 鍍層厚度/μm max | |||||||||||
b | c | b | c | b | c | |||||||||||||
所有 公稱 長度 | 公稱長度 L/mm | 所有 公稱 長度 | 公稱長度 L/mm | 所有 公稱 長度 | 公稱長度 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：為容納鍍層厚度而特殊制造的螺紋，其更大的基本偏差參見GB/T5267.1-2002表C.1。 | ||||||||||||||||||
a. 提供的粗牙螺距信息僅為方便使用。決定特性的是螺距。 b. 測量局部厚度時，鍍層厚度的最大值。 c. 測量批平均厚度時，鍍層厚度的最大值。 | ||||||||||||||||||
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Fasteners - Hot dip galvanized coatings
Metallic coatings - Electrodeposited coatings of nickel
Chemical conversion coatings - Black oxide coating on iron and steel - Specification and test methods
Specifications of Zinc / Chromate coatings
Chromate conversion coatings on electroplated zinc and cadmium coatings
Metallic coatings - Electroplated coatings of zinc and zinc alloys on iron or steel with supplementary Cr(Vl)-free treatment
Metallic coatings - Hot dip galvanized coatings on fabricated iron and steel articles - Specifications and test methods
Fasteners - Non-electrolytically applied zinc flake coatings systems
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Fasteners—Hot dip galvanized coatings
Passivation of corrosion-resistant stainless-steel fasteners
Metallic coatings - Electrodeposited coatings of nickel
Chromate conversion coatings on electroplated zinc and cadmium coatings
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Fasteners - Surface Discontinuities - Part 3: Bolts, Screws and Studs for Special Requirements
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Electroplated coatings on threaded components - Part 1: Cadmium on Steel Components - Part 2: Zinc on Steel Components
Selection principle and thickness series for metallic and chemical coating
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