UNIFIED SCREW THREADS COARSE SERIES, UNC

Note: The information contained here is for referance only of common standards and and may not accurately reflect actual product dimensions.

Please check the product details or ask if any dimension is critical

Designation

Pitch In.

Major
Diameter In.

Effective
Diameter In.

Minor Diameter In.

Nut

Bolt

1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
1-3/4
2
2-1/4
2-1/2
2-3/4
3
3-1/4
3-1/2
3-3/4
4

20 UNC
18 UNC
16 UNC
14 UNC
13 UNC
12 UNC
11 UNC
10 UNC
9 UNC
8 UNC
7 UNC
7 UNC
6 UNC
6 UNC
5 UNC
4½ UNC
4½ UNC
4 UNC
4 UNC
4 UNC
4 UNC
4 UNC
4 UNC
4 UNC

0.05000
0.05556
0.06250
0.07143
0.07692
0.08333
0.09091
0.10000
0.11111
0.12500
0.14286
0.14286
0.16667
0.16667
0.20000
0.22220
0.22220
0.50000
0.50000
0.50000
0.50000
0.25000
0.25000
0.25000

0.2500
0.3125
0.3750
0.4375
0.5000
0.5625
0.6250
0.7500
0.8750
1.0000
1.1250
1.2500
1.3750
1.5000
1.7500
2.0000
2.2500
2.5000
2.7500
3.0000
3.2500
3.5000
3.7500
4.0000

0.2175
0.2764
0.3344
0.3911
0.4500
0.5084
0.5660
0.6850
0.8028
0.9188
1.0322
1.1572
1.2667
1.3917
1.6201
1.8557
2.1057
2.3376
2.5876
2.8376
3.0876
3.3376
3.5876
3.8376

0.1959
0.2524
0.9073
0.3602
0.4167
0.4723
0.5266
0.6417
0.7547
0.8647
0.9704
1.0954
1.1946
1.3196
1.5335
1.7594
2.0094
2.2294
2.4794
2.7294
2.9794
3.2294
3.4794
3.7294

0.1887
0.2443
0.2983
0.3499
0.4056
0.4603
0.5135
0.6273
0.7387
0.8466
0.9497
1.0747
1.1705
1.2955
1.5046
1.7274
1.9774
2.1933
2.4433
2.6933
2.9433
3.1933
3.4433
3.6933