UNF Unified National Fine Threads, Pitch & Tap Drill Sizes Table

UNF Unified National Fine Threads, Pitch & Tap Drill Size Table
Nominal
dia.		Threads
per
inch		Tap
drill sizes
mm
No. 0
No. 1
No. 2
No. 3
No. 4		80
72
64
56
48		1.25
1.55
1.90
2.15
1.40
No. 5
No. 6
No. 8
No. 10
No. 12		44
40
36
32
28		1.70
1.95
3.50
4.10
4.70
1/8*
5/32*
3/16*
7/32*		40
32
32
32		2.65
3.30
4.10
4.90
1/4*
5/16*
3/8*
7/16*
1/2*		28
24
24
20
20		5.50
6.90
8.50
9.90
11.50
9/16*
5/8*
11/16*
13/16*
3/4*
7/8*
1*
1*		18
18
16
16
16
14
14
12		12.90
14.50
16.00
17.50
17.50
20.40
23.50
23.25
1.1/8*
1.1/4*
1.3/8*
1.1/2*		12
12
12
12		26.50
29.50
32.75
36.00