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My Account Product Search Product Catalog Metric Coarse Class 8.8Metric Set Screws 8.8Metric Coarse Class 10.9Metric Set Screws 10.9Metric Fine 8.8Metric Fine 10.9Grade 5 UNFGrade 5 Set Screws UNFGrade 5 UNCGrade 5 Set Screws UNCGrade 8 UNFGrade 8 UNCGrade C LocknutsGrade 9NylocsWashersSpecialsBrassCapscrewsFlangeFlange NutsGrade 8 UNC Plow BoltsKemtekLocknuts/ConelocksMetalfixRivetsRivnutsRivtecSpectrumStainless SteelStudsWing Nuts
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This technical information has been supplied by boltdepot.com

Bolt Size
Threads Per Inch (TPI)

Coarse Thread
UNC

Fine Thread
UNF
#2
56
-
#3
48
-
#4
40
-
#5
40
-
#6
32
-
#8
32
-
#10
24
32
#12
24
-
1/4
20
28
5/16
18
24
3/8
16
24
7/16
14
20
1/2
13
20
9/16
12
18
5/8
11
18
3/4
10
16
7/8
9
14
1
8
12*
1-1/8
7
12
1-1/4
7
12
1-1/2
6
12
* 12tpi is the UNF standard however 14tpi is far more common in actual use.