Hex bolts can be used for many different applications that include fastening wood, steel, and other construction materials for projects such as docks, bridges, highway structures, and buildings. Hex bolts with forged heads are also commonly used as headed anchor bolts.

They come in a wide range of different hex bolt sizes for custom applications depending on its dimensional requirements. These Hex Bolts come in anti-corrosion stainless steel, alloy steel, and carbon steel materials which ensures that the structure doesn’t weaken because of rust. Depending on the length of the bolt, it can come with standard threading or full threading.

Since it is made out of such strong materials, these high-quality grade 8.8 bolts are often used in high-temperature environments like automotive parts assembly. These Hex Bolts can also be used in marine and coastal operations due to their anti-corrosion property.

HEX BOLTS DIMENSIONS – DIN 933

Size	Pitch	Width across corner (e)	Width across Flat (s)	Head Thickness (k)	Thread Length b	Transition Diameter da	Dia. of washer face dw	Radius under head r	Depth of washer face c	Major Diameter (D)	Pitch Diameter (D1)	Minor Diameter (D2)
	MM	Min.	Min.	Max.	Min.	Max.	–	Max.	Min.	Min.	Min.	Max.	Min.	Min.	Min.	Max.	Min.
M16	2.0	26.17	23.16	24	9.71	10.29	FT	17.70	22.00	0.6	0.2	0.8	15.68	15.96	14.50	14.60	13.80
M18	2.5	29.56	26.16	27	11.15	11.85	FT	20.20	24.85	0.6	0.2	0.8	17.62	17.96	16.15	16.25	15.25
M20	2.5	32.95	29.16	30	12.15	12.85	FT	22.40	27.70	0.8	0.2	0.8	19.62	19.96	18.15	18.25	17.25
M22	2.5	37.29	33.00	34	13.65	14.35	FT	24.40	31.35	0.8	0.2	0.8	21.62	21.96	20.15	20.25	19.25
M24	3.0	39.55	35.00	36	14.65	15.35	FT	26.40	33.25	0.8	0.2	0.8	23.58	23.95	21.80	21.90	20.70
M27	3.0	45.20	40.00	41	16.65	17.35	FT	30.40	38.00	1.0	0.2	0.8	26.58	26.95	24.80	24.90	23.70
M30	3.5	50.85	45.00	46	18.28	19.12	FT	33.40	42.75	1.0	0.2	0.8	29.52	29.95	27.50	27.60	26.16
M33	3.5	55.37	49.00	50	20.58	21.42	FT	36.40	46.55	1.0	0.2	0.8	32.52	32.95	30.50	30.60	29.16
M36	4.0	60.79	53.80	55	22.08	22.92	FT	39.40	51.11	1.0	0.2	0.8	35.46	35.94	33.15	33.25	31.61
M39	4.0	66.44	58.80	60	24.58	25.42	FT	42.40	55.86	1.0	0.3	1.0	38.46	38.94	36.20	36.30	34.61
M42	4.5	71.30	63.10	65	25.58	26.42	FT	45.60	59.95	1.2	0.3	1.0	41.44	41.94	38.80	38.90	37.07
M45	4.5	76.95	68.10	70	27.58	28.42	FT	48.60	64.70	1.2	0.3	1.0	44.44	44.94	41.80	41.90	40.07
M48	5.0	82.60	73.10	75	29.58	30.42	FT	52.60	69.45	1.6	0.3	1.0	47.40	47.93	44.50	44.60	42.52
M52	5.0	88.25	78.10	80	32.50	33.50	FT	56.60	74.20	1.6	0.3	1.0	51.40	51.93	48.50	48.60	46.52
M56	5.5	93.56	82.80	85	34.50	35.50	FT	63.00	78.66	2.0	0.3	1.0	55.36	55.92	52.10	52.20	49.97
M60	5.5	99.21	87.80	90	37.50	38.50	FT	67.00	83.41	2.0	0.3	1.0	59.36	59.92	57.85	57.95	53.97
M64	6.0	104.86	92.80	95	39.50	40.50	FT	71.00	88.16	2.0	0.3	1.0	63.32	63.92	59.80	59.90	57.42

HEX BOLT DIMENSIONS – ISO 4017

D1D1	K	E	S
M3	2	6.01	5.5
M4	2.8	7.66	7
M5	3.5	8.79	8
M6	4	11.05	10
M8	5.3	14.38	13
M10	6.4	18.9	16
M12	7.5	21.1	18
M14	8.8	24.49	21
M16	10	26.75	24
M18	11.5	30.14	27
M20	12.5	33.53	30
M22	14	35.72	34
	15	39.98	36
M27	17	45.2	41
M30	18.7	50.85	46
M33	21	55.37	50
M36	22.5	60.79	55
M42	26	71.3	65
M48	30	82.6	75

HEX BOLTS DIMENSIONS – DIN 931

Thread Diameter	Pitch (mm)	s	k (min)	b (L < 125mm)	b (max) (L > 125mm)	b (max) (L > 200mm)
M3	0.50	5.5	2.0	12.0	–	–
M4	0.70	7.0	2.8	14.0	–	–
M5	0.80	8.0	3.5	16.0	22.0	–
M6	1.00	10.0	4.0	18.0	24.0	–
M7	1.00	11.0	4.8	20.0	26.0	–
M8	1.25	13.0	5.3	22.0	28.0	–
M10	1.50	17.0	6.4	26.0	32.0	45.0
M12	1.75	19.0	7.5	30.0	36.0	49.0
M14	2.00	22.0	8.8	34.0	40.0	53.0
M16	2.00	24.0	10.0	38.0	44.0	57.0
M18	2.50	27.0	11.5	42.0	48.0	61.0
M20	2.50	30.0	12.5	46.0	52.0	65.0
M22	2.50	34.0	14.0	50.0	56.0	69.0
M24	3.00	36.0	15.0	54.0	60.0	73.0
M27	3.00	41.0	17.0	60.0	66.0	79.0
M30	3.50	46.0	18.7	66.0	72.0	85.0
M33	3.50	50.0	21.0	72.0	78.0	91.0
M36	4.00	55.0	22.5	78.0	84.0	97.0
M39	4.00	60.0	25.0	84.0	90.0	103.0
M42	4.50	65.0	26.0	90.0	96.0	109.0
M45	4.50	70.0	28.0	96.0	102.0	115.0
M48	5.00	75.0	30.0	102.0	108.0	121.0
M52	5.00	80.0	33.0	–	116.0	129.0
M56	5.50	85.0	35.0	–	124.0	137.0
M60	5.50	90.0	38.0	–	132.0	145.0

HEX BOLT DIMENSIONS – ISO 4014

D1D1	B TO 125	B TO 200	B OVER 200	K	E	S
M4	14	–	–	2.8	7.66	7
M5	16	–	–	3.5	8.79	8
M6	18	24	–	4	11.05	10
M8	22	28	–	5.3	14.38	13
M10	26	32	45	6.4	18.9	16
M12	30	36	49	7.5	21.1	18
M14	34	40	53	8.8	24.49	21
M16	38	44	57	10	26.75	24
M18	42	48	61	11.5	30.14	27
M20	46	52	65	12.5	33.53	30
M22	50	56	69	14	35.72	34
M24	54	60	73	15	39.98	36
M27	60	66	79	17	45.2	41
M30	66	72	85	18.7	50.85	46
M33	72	78	91	21	55.37	50
M36	78	84	97	22.5	60.79	55
M42	90	96	109	26	71.3	65
M45	96	102	115	28	76.95	70
M48	102	108	121	30	82.6	75

HEX BOLTS DIMENSIONS – DIN 558

D	M5	M6	M8	M10	M12	M14	M16	M18	M20	M22	M24	M27	M30	M36	M42	M48	M56
K	3.5	4	5.3	6.4	7.5	8.8	10	11.5	12.5	14	15	17	18.7	22.5	26	30	35
C	0.5	0.5	0.6	0.6	0.6	0.6	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	1	1	1
R	0.2	0.25	0.4	0.4	0.6	0.6	0.6	0.6	0.8	0.8	0.8	1	1	1	1.2	1.6	2
A	2.4	3	4	4.5	5.3	6	6	7.5	7.5	7.5	9	9	10.5	12	13.5	15	16.5

HEX BOLT DIMENSIONS – ISO 4018

D1	S	E	K
M6	10	10.89	4
M8	13	14.2	5.3
M10	16	18.72	6.4
M12	18	20.88	7.5
M16	24	26.17	10
M20	30	32.95	12.5

BS1083 Precision Hex Bolts Sizes

Screw Thread(d)		1/4	5/16	3/8	7/16	1/2	9/16	5/8	3/4
PP	BSW	20	18	16	14	12	12	11	10
	BSF	26	22	20	18	16	16	14	12
ds	max	0.25	0.3125	0.375	0.4375	0.5	0.5625	0.625	0.75
	min	0.2465	0.309	0.3715	0.4335	0.496	0.5585	0.619	0.744
s	max	0.445	0.525	0.6	0.71	0.82	0.92	1.01	1.2
	min	0.438	0.518	0.592	0.702	0.812	0.912	1	1.19
e	max	0.51	0.61	0.69	0.82	0.95	1.06	1.17	1.39
k	max	0.176	0.218	0.26	0.302	0.343	0.375	0.417	0.5
	min	0.166	0.208	0.25	0.292	0.333	0.365	0.407	0.48
d1	max	0.075	0.075	0.075	0.11	0.11	0.143	0.143	0.174
	min	0.07	0.07	0.07	0.104	0.104	0.136	0.136	0.166
Drill Bit Size	(mm)	1.8	1.8	1.8	2.65	2.65	3.5	3.5	4.2

Screw Thread（d)		7/8	1	1-1/8	1-1/4	1-3/8	1-1/2	1-3/4	2
PP	BSW	9	8	7	7	–	6	5	4.5
	BSF	11	10	9	9	8	8	7	7
ds	max	0.875	1	1.125	1.25	1.375	1.5	1.75	2
	min	0.867	0.992	1.117	1.242	1.365	1.49	1.74	1.99
s	max	1.3	1.48	1.67	1.86	2.05	2.22	2.58	2.76
	min	1.288	1.468	1.64	1.815	2.005	2.175	2.52	2.7
e	max	1.5	1.71	1.93	2.15	2.37	2.56	2.98	3.19
k	max	0.583	0.666	0.75	0.83	0.92	1	1.17	1.33
	min	0.563	0.636	0.71	0.79	0.88	0.96	1.11	1.27
d1	max	0.174	0.208	0.208	0.238	0.238	0.238	0.271	0.333
	min	0.166	0.199	0.199	0.228	0.228	0.228	0.261	0.323
Drill Bit Size	(mm)	4.2	5.1	5.1	5.8	5.8	5.8	6.6	8.2

HEX BOLTS DIMENSIONS – EN 14399-4:2005

Thread Size(d)		M12	M16	M20	M22	M24	M27	M30	M36
P	Pitch	1.75	2	2.5	2.5	3	3	3.5	4
b	Ref.	23	28	33	34	39	41	44	52
ds	Nominal Size	12	16	20	22	24	27	30	36
	max	12.7	16.7	20.84	22.84	24.84	27.84	30.84	37
	min	11.3	15.3	19.16	21.16	23.16	26.16	29.16	35
e	min	23.91	29.56	35.03	39.55	45.2	50.85	55.37	66.44
k	Nominal Size	8	10	13	14	15	17	19	23
	max	8.45	10.75	13.9	14.9	15.9	17.9	20.05	24.05
	min	7.55	9.25	12.1	13.1	14.1	16.1	17.95	21.95
s	max	22	27	32	36	41	46	50	60
	min	21.16	26.16	31	35	40	45	49	58.8
r	min	1.2	1.2	1.5	1.5	1.5	2	2	2

DIN 601, Hex Head Bolts  / Half Thread Hexagonal head bolts

D	М5	М6	М8	М10	М12	М14	М16	М18	М20
K	3.5	4	5.3	6.4	7.5	8.8	10	11.5	12.5
c	0.5	0.5	0.6	0.6	0.6	0.6	0.8	0.8	0.8
R	0.2	0.25	0.4	0.4	0.6	0.6	0.6	0.6	0.8
Ds	5.48	6.48	8.58	10.58	12.7	14.7	16.7	18.7	20.84
e	8.63	10.89	14.2	18.72	20.88	23.91	26.17	29.56	32.95
S	8	10	13	17	19	22	24	27	30
L ≤ 125	16	18	22	26	30	34	38	42	46
125 < L ≤ 200	22	24	28	32	36	40	44	48	52
L > 200	–	–	–	45	49	53	57	61	65
D	М22	М24	М27	М30	М36	М42	М48	М56	М64
K	14	15	17	18.7	22.5	26	30	35	40
c	0.8	0.8	0.8	0.8	0.8	1	1	1	1
R	0.8	0.8	1	1	1	1.2	1.6	2	2
Ds	22.84	24.84	27.84	30.84	37	43	49	57.2	65.2
e	38.42	39.55	45.2	50.85	60.79	71.3	82.6	93.56	104.86
S	32	36	41	46	55	65	75	85	95
L ≤ 125	50	54	60	66	78	–	–	–	–
125 < L ≤ 200	56	60	66	72	84	96	108	–	–
L > 200	69	73	79	85	97	109	121	137	153

DIN 6914, Structural Hex Head Bolts 

 

d	M 12	M 16	M 20	M 22	M 24	M 27	M 30
s	22	27	32	36	41	46	50
e min.	23.91	29.56	35.03	39.55	45.2	50.85	55.37
k	8	10	13	14	15	17	19
l <  1)	21	26	31	32	34	37	40
b 1)	23	28	33	34	37	39	42
l >  2)	45	75	90	90	90	100	100
b 2)	23	28	33	34	37	39	42

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