Standard Thread Chart

Standard Thread Chart

Unified thread system ( inch system)

Unified form threads designated by abbreviations such as UNC, UNF, UNEF, UNS and UN, with the thread major diameter preceding the designation.

EX : ½ UNC , ½ UNF.

Threads in the UNC, UNF & UNEF categories have a fixed number of threads per inch (TPI) for a specific diameter.

EX; ½ UNC has 13 TPI, ½ UNF has 20 TPI.

Nominal Size Threads/in.
Series With Graded Pitches Series With Constant Pitches
Primary Secondary Basic Major Diameter Coarse UNC Fine UNF Extra-Fine UNEF 4-UN 6-UN 8-UN 12-UN 16-UN 20-UN 28-UN 32-UN Normal Size
0 0.600 80 0
1 0.0730 64 72 1
2 0.0860 56 64 2
3 0.0990 48 56 3
4 0.1120 40 48 4
5 0.1250 40 44 5
6 0.1380 32 40 6
8 0.1640 32 36 8
10 0.1900 24 32 10
12 0.2160 24 28 32 12
1/4 0.2500 20 28 32 UNC UNF UNEF 1/4
5/16 0.3125 18 24 32 20 28 UNEF 5/16
3/8 0.750 16 24 32 UNC 20 28 UNEF 3/8
7/16 0.4375 14 20 28 16 UNF UNEF 32 7/16
1/2 0.5000 13 20 28 16 UNF UNEF 32 1/2
9/16 0.5625 12 18 24 UNC 16 20 28 32 9/16
5/8 0.6250 11 18 24 12 16 20 28 32 5/8
11/16 0.6875 24 12 16 20 28 32 11/16
3/4 0.7500 10 16 20 12 UNF UNEF 28 28 3/4
13/16 0.8125 20 12 16 UNEF 28 32 13/16
7/8 0.8750 9 14 20 12 16 UNEF 28 32 7/8
15/16 0.9375 20 12 16 UNEF 28 32 15/16
1 1.0000 8 12 20 UNV UNF 16 UNEF 28 32 1
1-1/16 1.0625 18 8 12 16 20 28 1-1/16
1-1/8 1.1250 7 12 18 8 UNF 16 20 28 1-1/8
1-3/16 1.1875 18 8 12 16 20 28 1-3/16
1-1/4 1.250 7 12 18 8 UNF 16 20 28 1-1/4
1-5/16 1.3125 18 8 12 16 20 28 1-5/16
1-3/8 1.3750 6 12 18 UNC 8 UNF 16 20 28 1-3/8
1-7/16 1.4375 18 6 8 12 16 20 28 1-7/16
1-1/2 1.5000 6 12 18 UNC 8 UNF 16 20 28 1-1/2
1-9/16 1.5625 18 6 8 12 16 20 1-9/16
1-5/8 1.6250 18 6 8 12 16 20 1-5/8
1-11/16 1.6875 18 6 8 12 16 20 1-11/16
1-3/4 1.7500 5 6 8 12 16 20 1-3/4
1-13/16 1.8125 6 8 12 16 20 1-13/16
1-7/8 1.8750 6 8 12 16 20 1-7/8
1-15/16 1.9375 6 8 12 16 20 1-15/16
2 2.0000 4-1/2 6 8 12 16 20 2
2-1/8 2.1250 6 8 12 16 20 2-1/8
2-1/4 2.2500 4-1/2 6 8 12 16 20 2-1/4
2-3/8 2.3750 6 8 12 16 20 2-3/8
2-1/2 2.5000 4 UNC 6 8 12 16 20 2-1/2
2-5/8 2.6250 4 6 8 12 16 20 2-5/8
2-3/4 2.7500 4 UNC 6 8 12 16 20 2-3/4
2-7/8 4 6 8 12 16 20 2-7/8
3 3.0000 4 UNC 6 8 12 16 20 3
3-1/8 3.1250 4 6 8 12 16 3-1/8
3-1/4 3.2500 4 UNC 6 8 12 16 3-1/4
3-3/8 3.3750 4 6 8 12 16 3-3/8
3-1/2 3.5000 4 UNC 6 8 12 16 3-1/2
3-5/8 3.6250 4 6 8 12 16 3-5/8
3-3/4 3.7500 4 UNC 6 8 12 16 3-3/4
3-7/8 3.8750 4 6 8 12 16 3-7/8
4 4.0000 4 UNC 6 8 12 16 4
4-1/8 4.1250 4 6 8 12 16 4-1/8
4-1/4 4.2500 4 6 8 12 16 4-1/4
4-3/8 4.3750 4 6 8 12 16 4-3/8
4-1/2 4.5000 4 6 8 12 16 4-1/2
4-5/8 4.3750 4 6 8 12 16 4-5/8
4-3/4 4.8750 4 6 8 12 16 4-3/4
4-7/8 4.8750 4 6 8 12 16 4-7/8
5 5.0000 4 6 8 12 16 5
5-1/8 5.1250 4 6 8 12 16 5-1/8
5-1/4 5.2500 4 6 8 12 16 5-1/4
5-3/8 5.3750 4 6 8 12 16 5-3/8
5-1/2 5.5000 4 6 8 12 16 5-1/2
5-5/8 5.6250 4 6 8 12 16 5-5/8
5-3/4 5.7500 4 6 8 12 16 5-3/4
5-7/8 5.8750 4 6 8 12 16 5-7/8
6 6.0000 4 6 8 12 16 6
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