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The most complete conversion of metric, American and imperial threads between different threads in history

1 inch = 25.4 mm

Example: If you want to convert a US thread(american thread) with a diameter of 10 inches to a metric thread, we can simply multiply the diameter by 25.4, which is 10 × 25.4 = 254 mm; if we want to convert a metric thread with a diameter of 10 mm To make American threads, we only need to divide its diameter by 25.4, which is 10÷25.4=0.3937 inches

1. Metric thread specifications and corresponding pitch

单位: mm

序号 公称直径D，d 螺距
第1系列 第2系列 第3系列 粗牙 细牙
1 1 0.25 0.2
2 1.1 0.25 0.2
3 1.2 0.25 0.2
4 1.4 0.3 0.2
5 1.6 0.35 0.2
6 1.8 0.35 0.2
7 2 0.4 0.25
8 2.2 0.45 0.25
9 3 0.45 0.35
10 3 0.5 0.35
11 3.5 0.6 0.35
12 4 0.7 0.5
13 4.5 0.75 0.5
14 5 0.8 0.5
15 5.5 0.5
16 6 1 0.75
17 7 1 0.75
18 8 1.25 1 0.75
19 9 1.25 1 0.75
20 10 1.5 1.25 1 0.75
21 11 1.5 1.5 1 0.75
22 12 1.75 1.25 1
23 14 2 1.5 1.25 1
24 15 1.5 1
25 16 2 1.5 1
26 17 1.5 1
27 18 2.5 2 1.5 1
28 20 2.5 2 1.5 1
29 22 2.5 2 1.5 1
30 24 3 2 1.5 1
31 25 2 1.5 1
32 26 2 1.5 1
33 27 3 2 1.5 1
34 28 2 1.5 1
35 30 3.5 3 2 1.5 1
36 32 3 2 1.5
37 33 3.5 3 2 1.5
38 35 3 2 1.5
39 36 4 3 2 1.5
40 38 3 2 1.5
41 39 4 3 2 1.5
42 40 3 2 1.5
43 42 4.5 4 3 2 1.5
44 45 4.5 4 3 2 1.5
45 48 5 4 3 2 1.5
46 50 3 2 1.5
47 52 5 4 3 2 1.5
48 55 4 3 2 1.5
49 56 5.5 4 3 2 1.5
50 58 4 3 2 1.5
51 60 5.5 4 3 2 1.5
52 62 4 3 2 1.5
53 64 6 4 3 2 1.5
54 65 4 3 2 1.5
55 68 6 4 3 2 1.5
56 70 6 4 3 2 1.5
57 72 6 4 3 2 1.5
58 75 4 3 2 1.5
59 76 6 4 3 2 1.5
60 78 2
61 80 6 4 3 2 1.5
62 82 2
63 85 6 4 3 2
64 90 6 4 3 2
65 95 6 4 3 2
66 100 6 4 3 2
67 105 6 4 3 2
68 110 6 4 3 2
69 115 6 4 3 2
70 120 6 4 3 2
71 125 8 6 4 3 2
72 130 8 6 4 3 2
73 135 6 4 3 2
74 140 8 6 4 3 2
75 145 6 4 3 2
76 150 8 6 4 3 2
77 155 6 4 3
78 160 8 6 4 3
79 165 6 4 3
80 170 8 6 4 3
81 175 6 4 3
82 180 8 6 4 3
83 185 6 4 3
84 190 8 6 4 3
85 195 6 4 3
86 200 8 6 4 3
87 205 6 4 3
88 210 8 6 4 3
89 215 6 4 3
90 220 8 6 4 3
91 225 6 4 3
92 230 8 6 4 3
93 235 6 4 3
94 240 8 6 4 3
95 245 6 4 3
96 250 8 6 4 3
97 255 6 4
98 260 8 6 4
99 265 6 4
100 270 8 6 4
101 275 6 4
102 280 8 6 4
103 285 6 4
104 290 8 6 4
105 295 6 4
106 300 8 6 4

The first series of diameters is preferred, followed by the second series of diameters and finally the third series of diameters.

Refer to GB/T 193-2003 Ordinary thread diameter and pitch series

american thread,imperial threads, conversion of metric, metric conversion chart, metric system chart,mm to inches chart

2. American thread specifications and corresponding number of teeth

单位: inch

 

序号 公称直径D，d 大径D 粗牙UNC 细牙UNF 超细牙UNEF
1 #0 0.06 80
2 #1 0.073 64 72
3 #2 0.086 56 64
4 #3 0. 099 48 56
5 #4 0.112 40 48
6 #5 0.125 40 44
7 #6 0.138 32 40
8 #8 0.164 32 36
9 #10 0.19 24 32
10 #12 0.216 24 28 32
11 1/4 0.25 20 28 32
12 5/16 0.3125 18 24 32
13 3/8 0.375 16 24 32
14 7/16 0.4375 14 20 28
15 1/2 0.5 13 20 28
16 9/16 0.5625 12 18 24
17 5/8 0.625 11 18 24
18 11/16 0.6875 24
19 3/4 0.75 10 16 20
20 13/16 0.8125 20
21 7/8 0.875 9 14 20
22 15/16 0.9375 20
23 1 1 8 12 20
24 1-1/16 1.0625 18
25 1-1/8 1.125 7 12 18
26 1-3/16 1.1875 18
27 1-1/4 1.25 7 12 18
28 1-5/16 1.3125 18
29 1-3/8 1.375 6 12 18
30 1-7/16 1.4375 18
31 1-1/2 1.5 6 12 18
32 1-9/16 1.5625 18
33 1-5/8 1.625 18
34 1-11/16 1.6875 18
35 1-3/4 1.75 5
36 1-13/16 1.8125
37 1-7/8 1.875
38 1-15/16 1.9375
39 2 2 4.5
40 2-1/8 2.125
41 2-1/4 2.25 4.5
42 2-3/8 2.375
43 2-1/2 2.5 4
44 2-5/8 2.625
45 2-3/4 2.75 4
46 2-7/8 2.875
47 3 3 4
48 3-1/8 3.125
49 3-1/4 3.25 4
50 3-3/8 3.375
51 3-1/2 3.5 4
52 3-5/8 3.625
53 3-3/4 3.75 4
54 3-7/8 3.875
55 4 4 4
56 4-1/8 4.125
57 4-1/4 4.25
58 4-3/8 4.375
59 4-1/2 4.5
60 4-5/8 4.625
61 4-3/4 4.75
62 4-7/8 4.875
63 5 5
64 5-1/8 5.125
65 5-1/4 5.25
66 5-3/8 5.375
67 5-1/2 5.5
68 5-5/8 5.625
69 5-3/4 5.75
70 5-7/8 5.875
71 6 6

Refer to ASME B1.1-2003 unified inch thread

3. Inch thread specifications and corresponding number of teeth

单位：inch

序号 直径D 牙数P 细牙P 大径D
1 1/8 40 0.125
2 3/16 24 32 0.1875
3 7/32 28 0.2188
4 1/4 20 26 0.25
5 9/32 26 0.2812
6 5/16 18 22 0.3125
7 3/8 16 20 0.375
8 7/16 14 18 0.4375
9 1/2 12 16 0.5
10 9/16 12 16 0.5625
11 5/8 11 14 0.625
12 11/16 11 14 06875
13 3/4 10 12 0.75
14 7/8 9 11 0.875
15 1 8 10 1
16 1-1/8 7 9 1.125
17 1-1/4 7 9 1.25
18 1-3/8 8 1.375
19 1-1/2 6 8 1.5
20 1-5/8 8 1.625
21 1-3/4 5 7 1.75
22 2 4.5 7 2
23 2-1/4 4 6 2.25
24 2-1/2 4 6 2.5
25 2-3/4 35 6 2.75
26 3 3.5 5 3
27 3-1/4 3.25 3.25
28 3-1/2 3.25 3.5
29 3-3/4 3 3.75
30 4 3 4
31 4-1/2 2.875 4.5
32 5 2.75 5
33 5-1/2 2.625 5.5
34 6 2.5 6

Parallel threads to BS 84-2007 Whitworth thread style

Post time: Nov-03-2023
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