Thread Size Chart（UNC&UNF）

The table below provides a quick reference chart for UNC/UNF (Unified National Threads). It details the types, sizes, and specifications of Unified Coarse Thread (UNC) and Unified Fine Thread (UNF). This facilitates understanding the dimensional specifications of these threads.

UNC Thread Table

Thread	Thread Per Inch	Major Diameter	Minor Diameter Male Thread	Pitch	Tap Drill
#1-64	64	0.0730	0.0561	0.397	4.50
#2-56	56	0.0860	0.0667	0.453	1.80
#3-48	48	0.0990	0.0764	0.529	2.10
#4- 40	40	0.1120	0.0849	0.635	2.35
#5-40	40	0.1250	0.0979	0.635	2.65
#6- 32	32	0.1380	0.1042	0.794	2.85
#8- 32	32	0.1640	0.1302	0.794	3.50
#10-24	24	0.1900	0.1449	1.058	4.00
#12-24	24	0.2160	0.1709	1.058	4.65
1/4- 20	20	0.2500	0.1959	1.270	5.35
5/16-18	18	0.3125	0.2524	1.411	6.80
3/8- 16	16	0.3750	0.3073	1.587	8.25
7/16-14	14	0.4375	0.3602	1.814	9.65
1/2-13	13	0.5000	0.4167	1.954	11.15
9/16-12	12	0.5625	0.4723	2.117	12.60
5/8-11	11	0.6250	0.5266	2.309	14.05
3/4 -10	10	0.7500	0.6417	2.540	17.00
7/8-8	8	0.8750	0.7547	2.822	20.00
1-8	8	1.000	0.8647	3.175	22.85

UNF Thread Table

Thread	Thread Per Inch	Major Diameter	Minor Diameter Male Thread	Pitch	Tap Drill
#0-80	80	0.0600	0.0451	0.317	1.25
#1-72	72	0.0730	0.0565	0.353	1.55
#2-64	64	0.0860	0.0674	0.397	1.90
#3- 56	56	0.0990	0.0778	0.453	2.15
#4-48	48	0.1120	0.0871	0.529	2.40
#5-44	44	0.1250	0.0979	0.577	2.70
#6- 40	40	0.1380	0.1082	0.635	2.95
#8-36	36	0.1640	0.1309	0.635	2.95
#10-32	32	0.1900	0.1528	0.794	4.10
#12-28	28	0.2160	0.1734	0.907	4.70
1/4” – 28	28	0.2500	0.2074	0.907	5.50
5/16”- 24	24	0.3125	0.2629	1.058	6.90
3/8″- 24	24	0.3750	0.3254	1.058	8.50
7/16″- 20	20	0.4375	0.3780	1.270	9.90
1/2″- 20	20	0.5000	0.4405	1.270	11.50
9/16″-18	18	0.5625	0.4964	1.441	12.90
5/8”-18	18	0.6250	0.5589	1.411	14.50
3/4”-16	16	0.7500	0.6763	1.587	17.50
7/8″-14	14	0.8750	0.7900	1.814	20.40