Nominal Length (UNF)

Nominal Diameter	Pitch (mm)	Drill Bit Diameter (mm)	Drilling Diameter		Tap	Nominal Length
Nominal Diameter	Pitch (mm)	Drill Bit Diameter (mm)	min.	max.	Min Outer Diameter	1d	1.5d	2d	2.5d	3d
2-64	0.396	2.3	2.29	2.44	2.70	2.18	3.28	4.37	5.46	6.55
3-56	0.453	2.7	2.62	2.77	3.10	2.51	3.76	5.03	6.30	7.54
4-48	0.529	3.0	2.97	3.14	3.53	2.84	4.27	5.69	7.11	8.53
6-40	0.635	3.8	3.66	3.81	4.33	3.50	5.26	7.01	8.76	10.51
8-36	0.706	4.4	4.32	4.47	5.08	4.16	6.25	8.33	10.41	12.50
10-32	0.794	5.1	5.00	5.16	5.86	4.82	7.24	9.65	12.06	14.48
1/4-28	0.907	6.7	6.55	6.72	7.53	6.35	9.52	12.70	15.87	19.05
5/16-24	1.058	8.3	8.17	8.35	9.31	7.92	11.91	15.87	19.83	23.80
3/8-24	1.058	9.9	9.75	9.93	10.90	9.52	14.27	19.05	23.80	28.57
7/16-20	1.270	11.5	11.39	11.59	12.76	11.11	16.66	22.22	27.78	33.32
1/2-20	1.270	13.1	12.97	13.16	14.35	12.70	19.05	25.40	31.75	38.10
9/16-18	1.411	14.7	14.59	14.79	16.12	14.27	21.43	28.57	35.71	42.85
5/8-18	1.411	16.3	16.18	16.38	17.71	15.87	23.80	31.75	39.67	47.62
3/4-16	1.588	19.5	19.39	19.60	21.11	19.05	28.57	38.10	47.62	57.15
7/8-14	1.814	22.7	22.62	22.84	24.58	22.22	33.32	44.45	55.55	66.67
1"-14	1.814	26.0	25.86	26.11	27.76	25.40	38.10	50.80	63.50	76.20
1"-12	2.117	26.0	25.86	26.11	28.15	25.40	38.10	50.80	63.50	76.20
1" 1/8-12	2.117	29.2	29.03	29.29	31.33	28.57	42.85	57.15	71.42	85.72
1" 1/4-12	2.117	32.4	32.21	32.21	34.50	31.75	47.62	63.50	79.37	95.25
1" 3/8-12	2.117	35.5	35.38	35.38	37.68	34.92	52.37	69.85	87.30	104.77
1" 1/2-12	2.117	38.7	38.56	38.56	40.85	38.10	57.15	76.20	95.25	114.30

*All information is strictly informative