4. 直徑與牙數的标準系列
直徑與牙數标準組合系列應符合表1的規定。在表内，應選擇與直徑處于同一行内的牙數。
優先選用第一系列直徑。
對一般機械工程和商品緊固件，應優先選擇粗牙(UNC或UNRC)和細牙(UNF或UNRF)系列。如需要更小螺距的螺紋，則選擇超細牙系列(UNEF或UNREF)。粗牙、細牙和超細牙系列統稱為分類螺距系列。
當分類螺距系列無法滿足使用需求時，從8個恒定螺距系列(UN或UNR)中選取牙數。在恒定螺距系列中，優先選取8牙、12牙和16牙系列，不推薦選用括号内的牙數(4牙)。
6. 螺紋尺寸的米制化
先按英寸單位計算螺紋直徑的極限尺寸(最終尺寸)，然後利用1英寸等于25.4毫米進行米制尺寸轉化，最後進行米制尺寸的圓整。
本标準表1内的基本大徑是計算螺紋中徑和小徑基本尺寸，以及計算中徑公差和内螺紋小徑公差的依據，不宜代入米制形式的基本大徑進行有關尺寸和公差計算。
牙數的倒數是螺距，螺距是計算螺紋中徑和小徑基本尺寸以及螺紋公差的依據，不宜代入米制形式的螺距進行有關尺寸和公差計算。
基本大徑和螺距的米制尺寸可以作為螺紋檢驗、螺紋刀具和量規設計的參考尺寸。基本大徑和螺距的米制轉化值分别見表A.1和表A.2。
公稱直徑 | 基本 | 牙數/in n | |||||||||||
分類螺距系列 | 恒定螺距系列 | ||||||||||||
第一 | 第二 | 粗牙 | 細牙 | 超細牙 | 4 | 6 | 8 | 12 | 16 | 20 | 28 | 32 | |
0 |
| 0.0600 |
| 80 |
|
|
|
|
|
|
|
|
|
| 1 | 0.0730 | 64 | 72 |
|
|
|
|
|
|
|
|
|
2 |
| 0.0860 | 56 | 64 |
|
|
|
|
|
|
|
|
|
| 3 | 0.0990 | 48 | 56 |
|
|
|
|
|
|
|
|
|
4 |
| 0.1120 | 40 | 48 |
|
|
|
|
|
|
|
|
|
5 |
| 0.1250 | 40 | 44 |
|
|
|
|
|
|
|
|
|
6 |
| 0.1380 | 32 | 40 |
|
|
|
|
|
|
|
| UNC |
8 |
| 0.1640 | 32 | 36 |
|
|
|
|
|
|
|
| UNC |
10 |
| 0.1900 | 24 | 32 |
|
|
|
|
|
|
|
| UNF |
| 12 | 0.2160 | 24 | 28 | 32 |
|
|
|
|
|
| UNF | UNEF |
1/4 |
| 0.2500 | 20 | 28 | 32 |
|
|
|
|
| UNC | UNF | UNEF |
5/16 |
| 0.3125 | 18 | 24 | 32 |
|
|
|
|
| 20 | 28 | UNEF |
3/8 |
| 0.3750 | 16 | 24 | 32 |
|
|
|
| UNC | 20 | 28 | UNEF |
7/16 |
| 0.4375 | 14 | 20 | 28 |
|
|
|
| 16 | UNF | UNEF | 32 |
1/2 |
| 0.5000 | 13 | 20 | 28 |
|
|
|
| 16 | UNF | UNEF | 32 |
9/16 |
| 0.5625 | 12 | 18 | 24 |
|
|
| UNC | 16 | 20 | 28 | 32 |
5/8 |
| 0.6250 | 11 | 18 | 24 |
|
|
| 12 | 16 | 20 | 28 | 32 |
| 11/16 | 0.6875 |
|
| 24 |
|
|
| 12 | 16 | 20 | 28 | 32 |
3/4 |
| 0.7500 | 10 | 16 | 20 |
|
|
| 12 | UNF | UNEF | 28 | 32 |
| 13/16 | 0.8125 |
|
| 20 |
|
|
| 12 | 16 | UNEF | 28 | 32 |
7/8 |
| 0.8750 | 9 | 14 | 20 |
|
|
| 12 | 16 | UNEF | 28 | 32 |
| 15/16 | 0.9375 |
|
| 20 |
|
|
| 12 | 16 | UNEF | 28 | 32 |
1 |
| 1.0000 | 8 | 12 | 20 |
|
| UNC | UNF | 16 | UNEF | 28 | 32 |
| 1-1/16 | 1.0625 |
|
| 18 |
|
| 8 | 12 | 16 | 20 | 28 |
|
1-1/8 |
| 1.1250 | 7 | 12 | 18 |
|
| 8 | UNF | 16 | 20 | 28 |
|
| 1-3/16 | 1.1875 |
|
| 18 |
|
| 8 | 12 | 16 | 20 | 28 |
|
1-1/4 |
| 1.2500 | 7 | 12 | 18 |
|
| 8 | UNF | 16 | 20 | 28 |
|
| 1-5/16 | 1.3125 |
|
| 18 |
|
| 8 | 12 | 16 | 20 | 28 |
|
1-3/8 |
| 1.3750 | 6 | 12 | 18 |
| UNC | 8 | UNF | 16 | 20 | 28 |
|
| 1-7/16 | 1.4375 |
|
| 18 |
| 6 | 8 | 12 | 16 | 20 | 28 |
|
1-1/2 |
| 1.5000 | 6 | 12 | 18 |
| UNC | 8 | UNF | 16 | 20 | 28 |
|
| 1-9/16 | 1.5625 |
|
| 18 |
| 6 | 8 | 12 | 16 | 20 |
|
|
1-5/8 |
| 1.6250 |
|
| 18 |
| 6 | 8 | 12 | 16 | 20 |
|
|
| 1-11/16 | 1.6875 |
|
| 18 |
| 6 | 8 | 12 | 16 | 20 |
|
|
1.-3/4 |
| 1.7500 | 5 |
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
| 1-13/16 | 1.8125 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
1-7/8 |
| 1.8750 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
| 1-15/16 | 1.9375 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
2 |
| 2.0000 | 4-1/2 |
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
| 2-1/8 | 2.1250 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
2-1/4 |
| 2.2500 | 4-1/2 |
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
| 2-3/8 | 2.3750 |
|
|
|
| 6 | 8 | 12 | 16 | 20 |
|
|
2-1/2 |
| 2.5000 | 4 |
|
| UNC | 6 | 8 | 12 | 16 | 20 |
|
|
| 2-5/8 | 2.6250 |
|
|
| （4） | 6 | 8 | 12 | 16 | 20 |
|
|
2-3/4 |
| 2.7500 | 4 |
|
| UNC | 6 | 8 | 12 | 16 | 20 |
|
|
| 2-7/8 | 2.8750 |
|
|
| （4） | 6 | 8 | 12 | 16 | 20 |
|
|
3 |
| 3.0000 | 4 |
|
| UNC | 6 | 8 | 12 | 16 | 20 |
|
|
| 3-1/8 | 3.1250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
3-1/4 |
| 3.2500 | 4 |
|
| UNC | 6 | 8 | 12 | 16 |
|
|
|
| 3-3/8 | 3.3750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
3-1/2 |
| 3.5000 | 4 |
|
| UNC | 6 | 8 | 12 | 16 |
|
|
|
| 3-5/8 | 3.6250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
3-3/4 |
| 3.7500 | 4 |
|
| UNC | 6 | 8 | 12 | 16 |
|
|
|
| 3-7/8 | 3.8750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
4 |
| 4.0000 | 4 |
|
| UNC | 6 | 8 | 12 | 16 |
|
|
|
| 4-1/8 | 4.1250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
4-1/4 |
| 4.2500 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 4-3/8 | 4.3750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
4-1/2 |
| 4.5000 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 4-5/8 | 4.6250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
4-3/4 |
| 4.7500 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 4-7/8 | 4.8750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
5 |
| 5.0000 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 5-1/8 | 5.1250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
5-1/4 |
| 5.2500 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 5-3/8 | 5.3750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
5-1/2 |
| 5.5000 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 5-5/8 | 5.6250 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
5-3/4 |
| 5.7500 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
| 5-7/8 | 5.8750 |
|
|
| （4） | 6 | 8 | 12 | 16 |
|
|
|
6 |
| 6.0000 |
|
|
| 4 | 6 | 8 | 12 | 16 |
|
|
|
注1：對基本大徑小于1/4 in的前10個螺紋，其公稱直徑欄内所列出的自然數是公稱直徑代碼，不是公稱直徑 的英寸值。 | |||||||||||||
公稱 | 基本大徑 D、d |
| 公稱 | 基本大徑 D、d |
| 公稱 | 基本大徑 D、d | |||
in | mm | in | mm | in | mm | |||||
0 | 0.0600 | 1.5240 | 1-1/8 | 1.1250 | 28.5750 | 3-1/4 | 3.2500 | 82.5500 | ||
1 | 0.0730 | 1.8542 | 1-3/16 | 1.1875 | 30.1625 | 3-3/8 | 3.3750 | 85.7250 | ||
2 | 0.0860 | 2.1844 | 1-1/4 | 1.2500 | 31.7500 | 3-1/2 | 3.5000 | 88.9000 | ||
3 | 0.0990 | 2.5146 | 1-5/16 | 1.3125 | 33.3375 | 3-5/8 | 3.6250 | 92.0750 | ||
4 | 0.1120 | 2.8448 | 1-3/8 | 1.3750 | 34.9250 | 3-3/4 | 3.7500 | 95.2500 | ||
5 | 0.1250 | 3.1750 | 1-7/16 | 1.4375 | 36.5125 | 3-7/8 | 3.8750 | 98.4250 | ||
6 | 0.1380 | 3.5052 | 1-1/2 | 1.5000 | 38.1000 | 4 | 4.0000 | 101.6000 | ||
8 | 0.1640 | 4.1656 | 1-9/16 | 1.5625 | 39.6875 | 4-1/8 | 4.1250 | 104.7750 | ||
10 | 0.1900 | 4.8260 | 1-5/8 | 1.6250 | 41.2750 | 4-1/4 | 4.2500 | 107.9500 | ||
12 | 0.2160 | 5.4864 | 1-11/16 | 1.6875 | 42.8625 | 4-3/8 | 4.3750 | 111.1250 | ||
1/4 | 0.2500 | 6.3500 | 1-3/4 | 1.7500 | 44.4500 | 4-1/2 | 4.5000 | 114.3000 | ||
5/16 | 0.3125 | 7.9375 | 1-13/16 | 1.8125 | 46.0375 | 4-5/8 | 4.6250 | 117.4750 | ||
3/8 | 0.3750 | 9.5250 | 1-7/8 | 1.8750 | 47.6250 | 4-3/4 | 4.7500 | 120.6500 | ||
7/16 | 0.4375 | 11.1125 | 1-15/16 | 1.9375 | 49.2125 | 4-7/8 | 4.8750 | 123.8250 | ||
1/2 | 0.5000 | 12.7000 | 2 | 2.0000 | 50.8000 | 5 | 5.0000 | 127.0000 | ||
9/16 | 0.5625 | 14.2875 | 2-1/8 | 2.1250 | 53.9750 | 5-1/8 | 5.1250 | 130.1750 | ||
5/8 | 0.6250 | 15.8750 | 2-1/4 | 2.2500 | 57.1500 | 5-1/4 | 5.2500 | 133.3500 | ||
11/16 | 0.6875 | 17.4625 | 2-3/8 | 2.3750 | 60.3250 | 5-3/8 | 5.3750 | 136.5250 | ||
3/4 | 0.7500 | 19.0500 | 2-1/2 | 2.5000 | 63.5000 | 5-1/2 | 5.5000 | 139.7000 | ||
13/16 | 0.8125 | 20.6375 | 2-5/8 | 2.6250 | 66.6750 | 5-5/8 | 5.6250 | 142.8750 | ||
7/8 | 0.8750 | 22.2250 | 2-3/4 | 2.7500 | 69.8500 | 5-3/4 | 5.7500 | 146.0500 | ||
15/16 | 0.9375 | 23.8125 | 2-7/8 | 2.8750 | 73.0250 | 5-7/8 | 5.8750 | 149.2250 | ||
1 | 1.0000 | 25.4000 | 3 | 3.0000 | 76.2000 | 6 | 6.0000 | 152.4000 | ||
1-1/16 | 1.0625 | 26.9875 | 3-1/8 | 3.1250 | 79.3750 |
|
|
| ||
注：對基本大徑小于1/4 in的前10個螺紋，其公稱直徑欄内所列出的自然數是公稱直徑代碼，不是公稱直徑的英寸值。 | ||||||||||
牙數/in | 螺距 P |
| 牙數/in | 螺距 P | ||
in | mm | in | mm | |||
80 | 0.01250000 | 0.3175 | 16 | 0.06250000 | 1.5875 | |
72 | 0.01388889 | 0.3528 | 14 | 0.07142857 | 1.8143 | |
64 | 0.01562500 | 0.3969 | 13 | 0.07692308 | 1.9538 | |
56 | 0.01785714 | 0.4536 | 12 | 0.08333333 | 2.1167 | |
48 | 0.02083333 | 0.5292 | 11 | 0.09090909 | 2.3091 | |
44 | 0.02272727 | 0.5773 | 10 | 0.10000000 | 2.5400 | |
40 | 0.02500000 | 0.6350 | 9 | 0.111111111 | 2.8222 | |
36 | 0.02777778 | 0.7056 | 8 | 0.12500000 | 3.1750 | |
32 | 0.03125000 | 0.7938 | 7 | 0.14285714 | 3.6286 | |
28 | 0.03571429 | 0.9071 | 6 | 0.16666667 | 4.2333 | |
24 | 0.04166667 | 1.0583 | 5 | 0.20000000 | 5.0800 | |
20 | 0.05000000 | 1.2700 | 4.5 | 0.22222222 | 5.6444 | |
18 | 0.05555556 | 1.4111 | 4 | 0.25000000 | 6.3500 | |
Locking threads with 30 degree wedge ramp
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Run-outs, undercuts and chamfers for general purpose metric screw threads (ISO 3508:1976 / ISO 4755:1983)
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Deviations for constructional screw threads
Pipe threads where pressure-tight joints are made on the threads - Part 1: Dimensions, tolerances and designation
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Symmetrical thread HC [Figure 4]
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Limit gauges for metric screw threads
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Dimensions of Threads and Points for Type B and BP Thread-Forming Tapping Screws
Dimensions of Threads and Points for Type A Thread-Forming Tapping Screws
