What Is Thread Size Vs Head Size

Size And Thread Reference Table

Bones Major Diameter		Metric					American
		Nominal Dia. in mm	Spiral	Pitch In mm			Nominal Diameter	Threads / Inch
Inch	mm			Coarse	Fine	MPT		UNC	UNF	UNEF	NPT
0.010	0.25	0.25		0.075
0.012	0.thirty	0.iii		0.075
0.014	0.35	0.35		0.09
0.016	0.40	0.4		0.i
0.018	0.45	0.45		0.1
0.020	0.50	0.five		0.125
0.024	0.60	0.6		0.15
0.028	0.70	0.7		0.175
0.031	0.79
0.032	0.80	0.8		0.ii
0.035	0.90	0.ix		0.225
0.039	1.00	i	YES	0.25	0.2
0.047	i.20	i.2	YES	0.25	0.2
0.051	1.30
0.055	1.twoscore	one.4	YES	0.3	0.2, 0.25
0.059	one.50
0.060	ane.52						0		80
0.063	one.60	one.6	Yep	0.35	0.two
0.067	one.lxx	1.seven	YES	0.35	0.2, 0.25
0.071	1.80	i.8	Yes	0.35	0.2
0.073	ane.85						1	64	72
0.075	ane.90
0.079	2.00	two	YES	0.4	0.25, 0.35
0.086	ii.18						2	56	64
0.091	2.30	2.3	YES	0.four	0.25, 0.35
0.098	ii.fifty	two.5	YES	0.45	0.35
0.990	2.51						iii	48	56
0.102	2.lx	2.6	YES	0.45	0.25, 0.35
0.110	2.fourscore
0.112	2.84						4	40	48
0.118	3.00	iii	Yeah	0.5	0.35, 0.half dozen
0.125	3.18						5	40	44
0.126	3.xx
0.138	3.50	three.5	Aye	0.vi	0.35, 0.5		6	32	40
0.142	3.threescore
0.157	iv.00	4	Yep	0.seven	0.5, 0.75
0.161	four.x
0.164	4.17						8	32	36
0.177	4.50	4.5		0.75	0.5
0.185	four.70
0.188	4.76
0.190	4.83						10	24	32
0.197	5.00	5	Yes	0.8	0.v, 0.75, 0.9
0.209	five.30
0.216	5.49						12	24	28	32
0.219	five.56
0.236	6.00	6	YES	1	0.5, 0.75
0.250	vi.35						1/four	20	28	32
0.276	7.00	seven	Yes	ane	0.5, 0.75
0.281	7.xiv
0.313	vii.94						5/sixteen	18	24	32
0.313	seven.94						ane/xvi				27
0.315	8.00	8	Yeah	1.25	0.v, 0.75, 1	1
0.354	nine.00	9		1.25	0.75, 1
0.375	9.53						3/8	16	24	32
0.383	9.73
0.394	x.00	10	Yes	i.5	ane.25, 1, 0.75	i
0.405	10.29						1/8				27
0.433	11.00	eleven		one.5	1, 0.75, 1.25
0.438	xi.xi						vii/16	fourteen	20	28
0.472	12.00	12	YES	one.75	ane, 1.25, 1.five	1.five
0.500	12.70						1/two	13	20	28
0.518	thirteen.sixteen
0.540	13.72						i/4				xviii
0.551	14.00	14	Yeah	two	ane.25, 1.5
0.563	14.29						9/16	12	18	24
0.625	15.88						5/8	eleven	eighteen	24
0.630	xvi.00	xvi	YES	2	i, one.25, 1.5	1.5
0.656	16.66
0.675	17.fifteen						3/viii				18
0.688	17.46						11/xvi			24
0.709	eighteen.00	18	YES	2.5	1, 1.5, 2	1.five
0.750	xix.05						three/four	10	16	20
0.787	20.00	20	Aye	2.5	2, 1.5	1.v
0.813	20.64						13/16			twenty
0.825	20.96
0.840	21.34						1/2				14
0.866	22.00	22	Yes	2.5	2, one.5, i	one.5
0.875	22.23						7/8	9	14	20
0.902	22.91
0.938	23.81						xv/sixteen			20
0.945	24.00	24	Yep	3	two, 1.5, 1
i.000	25.40						i	viii	12	20
1.041	26.44
1.050	26.67						3/four				14
1.063	27.00	27	YES	3	2, 1.5, one		1 i/16		12	18
1.102	28.00	28			2, 1.5, one
i.125	28.58						i one/8	seven	12	18
1.181	xxx.00	30	YES	3.5	3, ii, i.5
i.188	30.16						1 3/sixteen			18
1.189	30.20
one.250	31.75						1 1/4	7	12	18
1.260	32.00	32			two, 1.5, 1
i.299	33.00	33	YES	3.5	iii, 2, one.5
1.309	33.25
1.313	33.34						i 5/16			eighteen
1.315	33.40						1				11/12
1.339	34.00	34			two, i.5, 1
1.375	34.93						1 3/viii	6	12	eighteen
1.378	35.00	35			ane.5, 1, ii
1.417	36.00	36	Yep	4	three, 2, 1.5
ane.438	36.51						1 vii/16			xviii
one.457	37.00	37			1.5
1.492	37.ninety
1.496	38.00	38			i.5, 2
1.500	38.ten						1 ane/2	6	12	18
1.535	39.00	39	YES	4	3, 2, 1.5
1.563	39.69						1 nine/16			18
1.575	twoscore.00	40			iii, 2, i.five
one.625	41.28						1 v/8			eighteen
ane.650	41.91
ane.654	42.00	42	Yeah	four.v	4, 3, 2, one.5
1.660	42.xvi						one 1/four				11 one/ii
1.688	42.86						1 xi/16			18
1.732	44.00				i.5
ane.745	44.32
i.750	44.45						i 3/iv	v
1.772	45.00	45	Aye	4.five	four, iii, two, 1.v
i.811	46.00	46			1.5
ane.882	47.fourscore
1.890	48.00	48	YES	5	4, iii, 2, ane.five
ane.900	48.26						1 i/2				eleven one/2
1.969	50.00	50			three, 2, 1.five
ii.000	50.80						2	4 1/2
2.047	52.00	52	YES	v	4, 3, ii, i.5
ii.205	56.00	56	Aye	5.five	4, three, 2, ane.v
2.250	57.xv						2 1/4	4 1/2
2.362	lx.00	60	YES	5.v	4, 3, 2, 1.5
2.375	60.33						2				eleven 1/2
2.500	63.50						2 1/ii	4
2.520	64.00	64	YES	vi	iv, 3, 2, 1.five

What Is Thread Size Vs Head Size,

Source: https://www.almabolt.com/pages/catalog/sidebar/sizethreadreference.htm

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