Unified coarse threads (UNC)

Nominal	Major	Major	Minor Dia.	Minor Dia.	Pitch	TPI	Pitch
	Diameter	Diameter	External	Internal	Diameter
Diameter	d(Inch)	d(mm)	d1(Inch)	d2(Inch)	Inch		mm
N 1 - 64 UNC	0.073	1.854	0.0538	0.0561	0.0629	64	0,397
N 2 - 56 UNC	0.086	2.184	0.0641	0.0667	0.0744	56	0,453
N 3 - 48 UNC	0.099	2.515	0.0734	0.0764	0.0855	48	0,529
N 4 - 40 UNC	0.112	2.845	0.0813	0.0849	0.0958	40	0,635
N 5 - 40 UNC	0.125	3.175	0.0943	0.0979	0.1088	40	0,635
N 6 - 32 UNC	0.138	3.505	0.0997	0.1042	0.1177	32	0,794
N 8 - 32 UNC	0.164	4.166	0.1257	0.1302	0.1437	32	0,794
N 10 - 24 UNC	0.19	4.826	0.1389	0.1449	0.1629	24	1,058
N 12 - 24 UNC	0.216	5.486	0.1649	0.1709	0.1889	24	1,058
1/4" - 20 UNC	0.25	6.350	0.1887	0.1959	0.2175	20	1,270
5/16" - 18 UNC	0.3125	7.938	0.2443	0.2524	0.2764	18	1,411
3/8" - 16 UNC	0.375	9.525	0.2983	0.3073	0.3344	16	1,587
7/16" - 14 UNC	0.4375	11.112	0.3499	0.3602	0.3911	14	1,814
1/2" - 13 UNC	0.5	12.700	0.4056	0.4167	0.45	13	1,954
9/16" - 12 UNC	0.5625	14.288	0.4603	0.4723	0.5084	12	2,117
5/8" - 11 UNC	0.625	15.875	0.5135	0.5266	0.566	11	2,309
3/4" - 10 UNC	0.75	19.050	0.6273	0.6417	0.685	10	2,540
7/8" - 9 UNC	0.875	22.225	0.7387	0.7547	0.8028	9	2,822
1" - 8 UNC	1.00	25.400	0.8466	0.8647	0.9188	8	3,175
1 1/8" - 7 UNC	1.125	28.575	0.9497	0.9704	1.0322	7	3,628
1 1/4" - 7 UNC	1.25	31.750	1.0747	1.0954	1.1572	7	3,628
1 3/8" - 6 UNC	1.375	34.925	1.1705	1.1946	1.2667	6	4,233
1 1/2" - 6 UNC	1.50	38.100	1.2955	1.3196	1.3917	6	4,233
1 3/4" - 5 UNC	1.75	44.450	1.5046	1.5335	1.6201	5	5,080
2" - 4 1/2 UNC	2.00	50.800	1.7274	1.7594	1.8557	4.5	5,644
2 1/4" - 4 1/2 UNC	2.25	57.150	1.9774	2.0094	2.1057	4.5	5,644
2 1/2" - 4 UNC	2.5	63.500	2.1933	2.2294	2.3376	4	6,350
2 3/4" - 4 UNC	2.75	69.850	2.4433	2.4794	2.5876	4	6,350
3" - 4 UNC	3.00	76.200	2.6933	2.7294	2.8376	4	6,350
3 1/4" - 4 UNC	3.25	82.550	2.9433	2.9794	3.0876	4	6,350
3 1/2" - 4 UNC	3.5	88.900	3.1933	3.2294	3.3376	4	6,350
3 3/4" - 4 UNC	3.75	95.250	3.4433	3.4794	3.5876	4	6,350
4" - 4 UNC	4.00	101.600	3.6933	3.7294	3.8376	4	6,350