Metric Hex Cap Screws Distributor

Inch Size Coarse(UNC) Fine(UNF)	Decimal Equivalent	Closest Metric Size	Decimal Conversion
1/4-20	.250	M6 X 1.0	.236″
1/4-28	.250	M6 X .075	.236
5/16-18	.3125	M8 X 1.25	.315
5/16-24	.3125	M8 X 1.0	.315
3/8-16	.375	M10 X 1.5	.394
3/8-24	.375	M10 X 1.25	.394
7/16-14	.4375
7/16-20	.4375
1/2-13	.500	M12 X 1.75	.472
1/2-20	.500	M12 X 1.25	.472
9/16-12	.5625	M14 X 2.0	.551
9/16-18	.5625	M14 X 1.5	.551
5/8-11	.625	M16 X 2.0	.630
5/8-18	.625	M16 X 1.5	.630
3/4-10	.750	M20 X 2.5	.787
3/4-16	.750	M20 X 1.5	.787
7/8-9	.875	M22 X 2.5	.866
7/8-14	.875	M22 X 1.5	.866
1-8	1.00	M24 X 3.0	.945
1-12	1.00	M24 X 2.0	.945
1-14	1.00
1 1/8-7	1.125
1 1/8-12	1.125
1 1/4-7	1.25	M30 X3.5	1.181
1 1/4-12	1.25	M30 X 2.0	1.181

Bolt Diameter (mm)	ANSI/ISO	DIN	DIN/ISO Heavy Hex
4	7	7
5	8	8
6	10	10
7		11
8	13	13
10	16	17
12	18	19	22/21
14	21	22
16	24	24	27
18		27
20	30	30	34/32

Tap	Drill Bit Size (Optional Fractional)
3mm x 0.50	2.5 mm
4 x 0.70	3.4
5 x 0.80	4.3
6 x 1.00	5.2
7 x 1.00	6.1 (15/64)
8 x 1.25	6.9 (17/64)
8 x 1.00	7.1
10 x 1.50	8.7
10 x 1.25	8.9 (11/32)
10 x 1.00	9.1
12 x 1.75	10.5
12 x 1.50	10.7 (27/64)
14 x 2.00	12.2
14 x 1.50	12.7
16 x 2.00	14.2 (35/64)
16 x 1.50	14.7

Metric Grade	Tensile Strength (Mpa) (Min)	Yield Strength, min, (Mpa)	Full Size Proofload, (Mpa)	Material	Treatment
Class 8.8 < 16mm	800	640	580	Carbon Steel	Quenched & Tempered
Class 8.8 > 16mm	830	660	600
Class 10.9	1040	940	830	Alloy Steel	Quenched & Tempered
Classs 12.9	1220	1100	970	Alloy Steel	Quenched & Tempered

Nominal Diameter Of Thread d(mm)	Pitch	Nominal Stress Area	Property Class
	P(mm)	As(mm2)	4.6	8.8	10.9	12.9
			Proof Load (As . Ap),N
3	0.5	5.03	1130	2920	4180	4880
3.5	0.6	6.78	1530	3940	5630	6580
4	0.7	8.78	1980	5100	7290	8520
5	0.8	14.2	3200	8230	11800	13800
6	1	20.1	4520	11600	16700	19500
7	1	28.9	6500	16800	24000	28000
8	1.25	36.6	8240	21200	30400	35500
10	1.5	58	13000	33700	48100	56300
12	1.75	84.3	19000	48900¹⁾	70000	81800
14	2	115	25900	66700¹⁾	95500	112000
16	2	157	35300	91000¹⁾	130000	152000
18	2.5	192	43200	11500	159000	186000
20	2.5	245	55100	147000	203000	238000
22	2.5	303	68200	182000	252000	294000
24	3	353	79400	212000	293000	342000
27	3	459	103000	275000	381000	445000
30	3.5	561	126000	337000	466000	544000
33	3.5	694	156000	416000	570000	673000
36	4	817	184000	490000	678000	792000
39	4	976	220000	586000		947000

TENSILE STRENGTH

Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing.

Yield Strength: The load at which a material exhibits a specific permanent deformation.

Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.

1MPa = 1N/mm2 = 145 pounds/inch2

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