Greg Mote: Mechanical Reference: US Fraction Thread

screw				tap			clearance
#	pitch	series	Ø	drill	"	mm	close fit		free fit
1/16	64	-	0.0625	3/64	0.0469	1.1913	52	0.0635	51	0.0670
1/16	72	-	0.0625	3/64	0.0469	1.1913	52	0.0635	51	0.0670
5/64	60	-	0.0781	1/16	0.0625	1.5875	46	0.0810	45	0.0820
5/64	72	-	0.0781	52	0.0635	1.6129	46	0.0810	45	0.0820
3/32	48	-	0.0938	49	0.0730	1.8542	41	0.0960	40	0.0980
3/32	50	-	0.0938	49	0.0730	1.8542	41	0.0960	40	0.0980
7/64	48	-	0.1094	43	0.0890	2.2606	34	0.1110	32	0.1160
1/8	32	-	0.1250	3/32	0.0938	2.3825	30	0.1285	29	0.1360
1/8	40	-	0.1250	38	0.1015	2.5781	30	0.1285	29	0.1360
9/64	40	-	0.1406	32	0.1160	2.9464	27	0.1440	26	0.1470
5/32	32	-	0.1563	1/8	0.1250	3.1750	20	0.1610	19	0.1660
5/32	36	-	0.1563	30	0.1285	3.2639	20	0.1610	19	0.1660
11/64	32	-	0.1719	9/64	0.1406	3.5712	16	0.1770	15	0.1800
3/16	24	-	0.1875	26	0.1470	3.7338	11	0.1910	9	0.1960
3/16	32	-	0.1875	22	0.1570	3.9878	11	0.1910	9	0.1960
13/64	24	-	0.2031	20	0.1610	4.0894	4	0.2090	3	0.2130
7/32	24	-	0.2188	16	0.1770	4.4958	2	0.2210	1	0.2280
7/32	32	-	0.2188	12	0.1890	4.8006	2	0.2210	1	0.2280
15/64	24	-	0.2344	10	0.1935	4.9149	C	0.2420	D	0.2460
1/4	20	NC	0.2500	7	0.2010	5.1054	G	0.2570	H	0.2660
	24	-		4	0.2090	5.3086
	27	-		3	0.2130	5.4102
	28	NF		3	0.2130	5.4102
	32	NEF		7/32	0.2188	5.5575
5/16	18	NC	0.3125	F	0.2570	6.5278	P	0.3230	Q	0.3320
	20	-		17/64	0.2656	6.7462
	24	NF		I	0.2720	6.9088
	27	-		J	0.2770	7.0358
	32	NEF		9/32	0.2812	7.1425
3/8	16	NC	0.3750	5/16	0.3125	7.9375	W	0.3860	X	0.3970
	20	-		21/64	0.3281	8.3337
	24	NF		Q	0.3320	8.4328
	27	-		R	0.3390	8.6106
	32	NEF		11/32	0.3438	8.7325
7/16	14	NC	0.4375	U	0.3680	9.3472	29/64	0.4531	15/32	0.4687
	20	NF		25/64	0.3906	9.9212
	24	-		X	0.3970	10.0838
	27	-		Y	0.4040	10.2616
	28	NEF		15/32	0.4688	11.9075
1/2	12	-	0.5000	27/64	0.4219	10.7163	33/64	0.5156	17/32	0.5312
	13	NC		27/64	0.4219	10.7163
	20	NF		29/64	0.4531	11.5087
	24	-		29/64	0.4531	11.5087
	27	-		15/32	0.4688	11.9075
	28	NEF		15/32	0.4688	11.9075
9/16	12	NC	0.5625	31/64	0.4844	12.3038	37/64	0.5781	19/32	0.5938
	18	NF		33/64	0.5156	13.0962
	24	NEF		33/64	0.5156	13.0962
	27	-		17/32	0.5313	13.4950
5/8	11	NC	0.6250	17/32	0.5313	13.4950	41/64	0.6406	21/32	0.6562
	12	-		35/64	0.5469	13.8913
	18	NF		37/64	0.5781	14.6837
	24	NEF		37/64	0.5781	14.6837
	27	-		19/32	0.5937	15.0800
11/16	11	-	0.6875	19/32	0.5937	15.0800	45/64	0.7031	23/32	0.6562
	16	-		5/8	0.6250	15.8750
	24	NEF		41/64	0.6406	16.4084
3/4	10	NC	0.7500	21/32	0.6562	16.6675	49/64	0.7656	25/32	0.7812
	12	-		43/64	0.6719	17.0663
	16	NF		11/16	0.6875	17.4625
	20	NEF		45/64	0.7031	17.8587
	27	-		23/32	0.7187	18.2550
13/16	10	-	0.8125	23/32	0.7187	18.2550	53/64	0.8281	27/32	0.8438
13/16	20	NEF	0.8125	49/64	0.7656	19.4462	53/64	0.8281	27/32	0.8438
7/8	9	NC	0.8750	49/64	0.7656	19.4462	57/64	0.8906	29/32	0.9062
	12	-		51/64	0.7969	20.2413
	14	NF		13/16	0.8125	20.6375
	18	-		53/64	0.8281	21.0337
	20	NEF		53/64	0.8281	21.0337
	27	-		27/32	0.8437	21.4300
15/16	9	-	0.9375	53/64	0.8281	21.0337	61/64	0.9531	31/32	0.9688
15/16	20	NEF	0.9375	57/64	0.8906	22.6212	61/64	0.9531	31/32	0.9688
1	8	NC	1.0000	7/8	0.8750	22.2250	1-1/64	1.0156	1-1/32	1.0313
	12	NF		59/64	0.9219	23.4163
	14	-		15/16	0.9375	23.8125
	20	NEF		61/64	0.9531	24.2087
	27	-		31/32	0.9687	24.6050
	32	?		31/32	0.9687	24.6050
1-1/16	18	NEF	1.0625	1	1.0000	25.4000	1-5/64	1.0781	1-3/32	1.0938
1-1/8	7	NC	1.1250	63/64	0.9844	25.0038	1-9/64	1.1406	1-5/32	1.1562
	12	NF		1-3/64	1.0469	26.5913
	18	NEF		1-1/16	1.0625	26.9875
1-3/16	18	NEF	1.1875	1-1/8	1.1250	28.5750	1-13/64	1.2031	1-7/32	1.2188
1-1/4	7	NC	1.2500	1-7/64	1.1094	28.1788	1-17/64	1.2656	1-9/32	1.2812
	12	NF		1-11/64	1.1719	29.7663
	18	NEF		1-3/16	1.1875	30.1625
1-5/16	18	NEF	1.3125	1-1/4	1.2500	31.7500	1-21/64	1.3281	1-11/32	1.3438
1-3/8	6	NC	1.3750	1-7/32	1.2188	30.9575	1-25/64	1.3906	1-13/32	1.4062
	12	NF		1-19/64	1.2969	32.9413
	18	NEF		1-5/16	1.3125	33.3375
1-7/16	18	NEF	1.3693	1-3/8	1.3750	34.9250	1-29/64	1.4531	1-15/32	1.4688
1-1/2	6	NC	1.5000	1-11/32	1.3438	34.1325	1-33/64	1.5156	1-17/32	1.5312
	12	NF		1-27/64	1.4219	36.1163
	18	NEF		1-7/16	1.4375	36.5125
1-9/16	18	NEF	1.5625	1-1/2	1.5000	38.1000	1-37/64	1.5781	1-19/32	1.5938
1-5/8	5 1/2	-	1.6250	1-29/64	1.4531	36.9087	1-41/64	1.6406	1-21/32	1.6562
1-5/8	18	NEF	1.6250	1-9/16	1.5625	39.6875	1-41/64	1.6406	1-21/32	1.6562
1-11/16	18	NEF	1.6875	1-5/8	1.6250	41.2750	1-45/64	1.7031	1-23/32	1.7188
1-3/4	5	NC	1.7500	1-9/16	1.5625	39.6875	1-49/64	1.7659	1-25/32	1.7812
1-7/8	5	-	1.8750	1-11/16	1.6875	42.8625	?	?	?	?
2	4 1/2	NC	2.0000	1-25/32	1.7813	45.2450	?	?	?	?