Technical Resources for manufacturing professionals-UNC/UNF Threads-Ningbo Tokatsu Hose Industry Co., Ltd.

Technical Resources for manufacturing professionals-UNC/UNF Threads

Jul21,2017

Tap size	NF/NC UNF/UNC	Threads per inch	Basic major dia (inches)	Basic effective dia (inches)	Basic minor dia of ext. threads (inches)	Basic minor dia of int. threads (inches)	Drill size
0-80	UNF	80	0.06	0.0519	0.0447	0.0465	3/64
1-64	UNC	64	0.073	0.0629	0.0538	0.0561	#54
2-56	UNC	56	0.086	0.0744	0.0641	0.0667	#50
2-64	UNF	64	0.086	0.0759	0.0668	0.0691	#50
4-40	UNC	40	0.112	0.0958	0.0813	0.0849	#43
4-48	UNF	48	0.112	0.0985	0.0864	0.0894	#42
5-40	UNC	40	0.125	0.1088	0.0943	0.0979	#38
5-44	UNF	44	0.125	0.1102	0.0971	0.1004	#37
6-32	UNC	32	0.136	0.1177	0.0997	0.1042	#36
6-40	UNF	40	0.136	0.1218	0.1073	0.1109	#33
8-32	UNC	32	0.164	0.1437	0.1257	0.1302	#29
8-36	UNF	36	0.164	0.146	0.1299	0.1339	#29
10-24	UNC	24	0.19	0.1629	0.1389	0.1449	#25
10-32	UNF	32	0.19	0.1697	0.1517	0.1562	#21
1/4-20	UNC	20	0.25	0.2175	0.1887	0.1959	#7
1/4-28	UNF	28	0.25	0.2268	0.2062	0.2113	#3
5/16-18	UNC	18	0.3125	0.2764	0.2443	0.2524	F
5/16-24	UNF	24	0.3125	0.2854	0.2614	0.2674	I
3/8-16	UNC	16	0.375	0.3344	0.2983	0.3073	5/16
3/8-24	UNF	24	0.375	0.3479	0.3239	0.3299	Q
7/16-14	UNC	14	0.4375	0.3911	0.3499	0.3602	U
7/16-20	UNF	20	0.4375	0.405	0.3762	0.3834	25/64
1/2-13	UNC	13	0.5	0.45	0.4056	0.4167	27/64
1-2/20	UNF	20	0.5	0.4675	0.4387	0.4459	29/64
9/16-12	UNC	12	0.5625	0.5084	0.4603	0.4723	31/64
9/16-18	UNF	18	0.5625	0.5264	0.4943	0.5024	33/64
5/8-11	UNC	11	0.625	0.566	0.5135	0.5266	17/32
5-8/18	UNF	18	0.625	0.5869	0.5568	0.5649	37/64
3/4-10	UNC	10	0.75	0.665	0.6273	0.6417	21/32
3/4-16	UNF	16	0.75	0.7094	0.6733	0.6823	11/16
7/8-9	UNC	9	0.875	0.8028	0.7387	0.7547	49/64
7/8-14	UNF	14	0.875

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