UNC Screw Thread per ANSI B1.1
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|
UNC Screw
Thread per ANSI B1.1 2003 |
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|
UNC = Unified
National Coarse Screw Thread. |
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|
Nominal |
Major |
Major |
Tapping |
TPI |
Pitch |
|
Diameter |
Diameter |
Diameter |
Drill Size |
mm |
|
|
|
Inch |
mm |
mm |
|
|
|
#1 - 64 UNC |
0.0730 |
1.854 |
1.50 |
64 |
0.397 |
|
#2 - 56 UNC |
0.0860 |
2.184 |
1.80 |
56 |
0.453 |
|
#3 - 48 UNC |
0.0990 |
2.515 |
2.10 |
48 |
0.529 |
|
#4 - 40 UNC |
0.1120 |
2.845 |
2.35 |
40 |
0.635 |
|
#5 - 40 UNC |
0.1250 |
3.175 |
2.65 |
40 |
0.635 |
|
#6 - 32 UNC |
0.1380 |
3.505 |
2.85 |
32 |
0.794 |
|
#8 - 32 UNC |
0.1640 |
4.166 |
3.50 |
32 |
0.794 |
|
#10 - 24 UNC |
0.1900 |
4.826 |
4.00 |
24 |
1.058 |
|
#12 - 24 UNC |
0.2160 |
5.486 |
4.65 |
24 |
1.058 |
|
1/4" - 20
UNC |
0.2500 |
6.350 |
5.35 |
20 |
1.270 |
|
5/16" -
18 UNC |
0.3125 |
7.938 |
6.80 |
18 |
1.411 |
|
3/8" - 16
UNC |
0.3750 |
9.525 |
8.25 |
16 |
1.587 |
|
7/16" -
14 UNC |
0.4375 |
11.112 |
9.65 |
14 |
1.814 |
|
1/2" - 13
UNC |
0.5000 |
12.700 |
11.15 |
13 |
1.954 |
|
9/16" -
12 UNC |
0.5625 |
14.288 |
12.60 |
12 |
2.117 |
|
5/8" - 11
UNC |
0.6250 |
15.875 |
14.05 |
11 |
2.309 |
|
3/4" -
10 UNC |
0.7500 |
19.050 |
17.00 |
10 |
2.540 |
|
7/8" - 9
UNC |
0.8750 |
22.225 |
20.00 |
9 |
2.822 |
|
1" - 8
UNC |
1.0000 |
25.400 |
22.85 |
8 |
3.175 |
|
1-1/8" -
7 UNC |
1.1250 |
28.575 |
25.65 |
7 |
3.628 |
|
1-1/4" -
7 UNC |
1.2500 |
31.750 |
28.85 |
7 |
3.628 |
|
1-3/8" -
6 UNC |
1.3750 |
43.925 |
31.55 |
6 |
4.233 |
|
1-1/2" -
6 UNC |
1.5000 |
38.100 |
34.70 |
6 |
4.233 |
|
1-3/4" -
5 UNC |
1.7500 |
44.450 |
40.40 |
5 |
5.080 |
|
2" -
4-1/2 UNC |
2.0000 |
50.800 |
46.30 |
4.5 |
5.644 |
|
2-1/4" -
4-1/2 UNC |
2.2500 |
57.150 |
52.65 |
4.5 |
5.644 |
|
2-1/2" -
4 UNC |
2.5000 |
63.500 |
58.50 |
4 |
6.350 |
|
2-3/4" -
4 UNC |
2.7500 |
69.850 |
64.75 |
4 |
6.350 |
|
3" - 4
UNC |
3.0000 |
63.500 |
71.10 |
4 |
6.350 |
|
3-1/4" -
4 UNC |
3.2500 |
82.550 |
77.45 |
4 |
6.350 |
|
3-1/2" -
4 UNC |
3.5000 |
88.900 |
83.80 |
4 |
6.350 |
|
3-3/4" -
4 UNC |
3.7500 |
95.250 |
90.15 |
4 |
6.350 |
|
4" - 4
UNC |
4.0000 |
101.600 |
96.50 |
4 |
6.350 |
|
UNC Screw
Thread |
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