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Grade 12.9 Hex Head Bolts

Name: Grade 12.9 Hex Head Bolts
Brand: Befast Co., Ltd.

Grade 12.9 hex head bolts are among the strongest bolts available, offering superior tensile strength for the most demanding applications, such as in heavy machinery, industrial equipment, and structural construction projects. They are designed to withstand extreme stress and high loads.

Crafted from alloy steel and treated for exceptional hardness, Grade 12.9 bolts provide outstanding durability, making them ideal for industries that require the highest levels of performance under tough conditions.

Products

Specifications of Grade 12.9 Hex Head Bolts

Name	Hex Bolts	Materials	Carbon Steel/Stainless Steel
Standards	DIN ISO ANC BSW JIS etc.	Strength level	4.8 8.8 10.9 12.9 A2-70 A4-70 A4-80
Size	M3-M50	Surface finish	ZP\HDG\BLACK\Dacromet etc.
Length	15-500	Samples	Available

Grade 12.9 Hex Head Bolts Dimension

Hexagon Head Thick Shank Half Thread Bolts M1.6-M39 DIN 931

thread size			M1.6	M2	M2.5	M3	(M3.5)	M4	M5	M6	(M7)	M8	M10	M12
d			M1.6	M2	M2.5	M3	(M3.5)	M4	M5	M6	(M7)	M8	M10	M12
P	pitch		0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1	1.25	1.5	1.75
b	Reference	L≤125	9	10	11	12	13	14	16	18	20	twenty two	26	30
		125＜L≤200	-	-	-	-	-	-	twenty two	twenty four	26	28	32	36
		L＞200	-	-	-	-	-	-	-	-	-	-	45	49
c	minimum		0.1	0.1	0.1	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15
c	maximum value		0.25	0.25	0.25	0.4	0.4	0.4	0.5	0.5	0.5	0.6	0.6	0.6
d _a	maximum value		2	2.6	3.1	3.6	4.1	4.7	5.7	6.8	7.8	9.2	11.2	13.7
d_s	max = nominal		1.6	2	2.5	3	3.5	4	5	6	7	8	10	12
	minimum	Class A	1.46	1.86	2.36	2.86	3.32	3.82	4.82	5.82	6.78	7.78	9.78	11.73
	minimum	Class B	-	-	-	-	-	-	-	-	-	-	-	-
d_w	minimum	Class A	2.4	3.2	4.1	4.6	5.1	5.9	6.9	8.9	9.8	11.6	15.6	17.4
d_w	minimum	Class B	-	-	-	-	-	-	-	-	-	-	-	-
and	minimum	Class A	3.41	4.32	5.45	6.01	6.58	7.66	8.79	11.05	12.12	14.38	18.9	21.1
and	minimum	Class B	-	-	-	-	-	-	-	-	-	-	-	-
k	Nominal		1.1	1.4	1.7	2	2.4	2.8	3.5	4	4.8	5.3	6.4	7.5
	Class A	minimum	0.98	1.28	1.58	1.88	2.28	2.68	3.35	3.85	4.65	5.15	6.22	7.32
	Class A	maximum value	1.22	1.52	1.82	2.12	2.52	2.92	3.65	4.15	4.95	5.45	6.58	7.68
	Class B	minimum	-	-	-	-	-	-	-	-	-	-	-	-
	Class B	maximum value	-	-	-	-	-	-	-	-	-	-	-	-
k ₁	minimum		0.7	0.9	1.1	1.3	1.6	1.9	2.28	2.63	3.19	3.54	4.28	5.05
r	minimum		0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.25	0.25	0.4	0.4	0.6
s	max = nominal		3.2	4	5	5.5	6	7	8	10	11	13	17	19
	minimum	Class A	3.02	3.82	4.82	5.32	5.82	6.78	7.78	9.78	10.73	12.73	16.73	18.67
	minimum	Class B	-	-	-	-	-	-	-	-	-	-	-	-
thread length b			-	-	-	-	-	-	-	-	-	-	-	-

thread size			(M14)	M16	(M18)	M20	(M22)	M24	(M27)	M30	(M33)	M36	(M39)
d			(M14)	M16	(M18)	M20	(M22)	M24	(M27)	M30	(M33)	M36	(M39)
P	pitch		2	2	2.5	2.5	2.5	3	3	3.5	3.5	4	4
b	Reference	L≤125	34	38	42	46	50	54	60	66	72	78	84
		125＜L≤200	40	44	48	52	56	60	66	72	78	84	90
		L＞200	53	57	61	65	69	73	79	85	91	97	103
c	minimum		0.15	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3
c	maximum value		0.6	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	1
d _a	maximum value		15.7	17.7	20.2	22.4	24.4	26.4	30.4	33.4	36.4	39.4	42.4
d_s	max = nominal		14	16	18	20	twenty two	twenty four	27	30	33	36	39
	minimum	Class A	13.73	15.73	17.73	19.67	21.67	23.67	-	-	-	-	-
	minimum	Class B	-	15.57	17.57	19.48	21.48	23.48	26.48	29.48	32.38	35.38	38.38
d_w	minimum	Class A	20.5	22.5	25.3	28.2	30	33.6	-	-	-	-	-
d_w	minimum	Class B	-	twenty two	24.8	27.7	29.5	33.2	38	42.7	46.6	51.1	55.9
and	minimum	Class A	24.49	26.75	30.14	33.53	35.72	39.98	-	-	-	-	-
and	minimum	Class B	-	26.17	29.56	32.95	35.03	39.55	45.2	50.85	55.37	60.79	66.44
k	Nominal		8.8	10	11.5	12.5	14	15	17	18.7	twenty one	22.5	25
	Class A	minimum	8.62	9.82	11.28	12.28	13.78	14.78	-	-	-	-	-
	Class A	maximum value	8.98	10.18	11.72	12.72	14.22	15.22	-	-	-	-	-
	Class B	minimum	-	9.71	11.15	12.15	13.65	14.65	16.65	18.28	20.58	22.08	24.58
	Class B	maximum value	-	10.29	11.85	12.85	14.35	15.35	17.35	19.12	21.42	22.92	25.42
k ₁	minimum		5.96	6.8	7.8	8.5	9.6	10.3	11.7	12.8	14.4	15.5	17.2
r	minimum		0.6	0.6	0.6	0.8	0.8	0.8	1	1	1	1	1
s	max = nominal		twenty two	twenty four	27	30	32	36	41	46	50	55	60
	minimum	Class A	21.67	23.67	26.67	29.67	31.61	35.38	-	-	-	-	-
	minimum	Class B	-	23.16	26.16	29.16	31	35	40	45	49	53.8	58.8
thread length b			-	-	-	-	-	-	-	-	-	-	-

Full Thread Hexagon Head Bolts Grade A and B DIN 933

Thread specification			M1.6	M2	M2.5	M3	(M3.5)	M4	M5	M6	(M7)	M8	M10	M12	(M14)	M16
d			M1.6	M2	M2.5	M3	(M3.5)	M4	M5	M6	(M7)	M8	M10	M12	(M14)	M16
P	pitch		0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1	1.25	1.5	1.75	2	2
a	maximum value		1.05	1.2	1.35	1.5	1.8	2.1	2.4	3	3	3.75	4.5	5.25	6	6
c	minimum		0.1	0.1	0.1	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.2
c	maximum value		0.25	0.25	0.25	0.4	0.4	0.4	0.5	0.5	0.5	0.6	0.6	0.6	0.6	0.8
d _a	maximum value		2	2.6	3.1	3.6	4.1	4.7	5.7	6.8	7.8	9.2	11.2	13.7	15.7	17.7
d_w	Class A	minimum	2.4	3.2	4.1	4.6	5.1	5.9	6.9	8.9	9.6	11.6	15.6	17.4	20.5	22.5
d_w	Class B	minimum	-	-	-	-	-	5.7	6.7	8.7	9.4	11.4	15.4	17.2	20.1	twenty two
and	Class A	minimum	3.41	4.32	5.45	6.01	6.58	7.66	8.79	11.05	12.12	14.38	18.9	21.1	24.49	26.75
and	Class B	minimum	-	-	-	-	-	7.5	8.63	10.89	11.94	14.2	18.72	20.88	23.91	26.17
k	Nominal		1.1	1.4	1.7	2	2.4	2.8	3.5	4	4.8	5.3	6.4	7.5	8.8	10
	Class A	minimum	0.98	1.28	1.58	1.88	2.28	2.68	3.35	3.85	4.65	5.15	6.22	7.32	8.62	9.82
	Class A	maximum value	1.22	1.52	1.82	2.12	2.52	2.92	3.65	4.15	4.95	5.45	6.56	7.68	8.98	10.18
	Class B	minimum	-	-	-	-	-	2.6	3.26	3.76	4.56	5.06	6.11	7.21	8.51	9.71
	Class B	maximum value	-	-	-	-	-	3	3.74	4.24	5.04	5.54	6.69	7.79	9.09	10.29
k ₁	minimum		0.7	0.9	1.1	1.3	1.6	1.9	2.28	2.63	3.19	3.54	4.28	5.05	5.96	6.8
r	minimum		0.1	0.1	0.1	0.1	0.1	0.2	0.2	0.25	0.25	0.4	0.4	0.6	0.6	0.6
s	max = nominal		3.2	4	5	5.5	6	7	8	10	11	13	17	19	twenty two	twenty four
	Class A	minimum	3.02	3.82	4.82	5.32	5.82	6.78	7.78	9.78	10.73	12.73	16.73	18.67	21.67	23.67
	Class B	minimum	-	-	-	-	-	6.64	7.64	9.64	10.57	12.57	16.57	18.48	21.16	23.16
Thousand pieces of steel weight ≈kg			-	-	-	-	-	-	-	-	-	-	-	-	-	-

Thread specification			(M18)	M20	(M22)	M24	(M27)	M30	(M33)	M36	(M39)	M42	(M45)	M48	(M52)
d			(M18)	M20	(M22)	M24	(M27)	M30	(M33)	M36	(M39)	M42	(M45)	M48	(M52)
P	pitch		2.5	2.5	2.5	3	3	3.5	3.5	4	4	4.5	4.5	5	5
a	maximum value		7.5	7.5	7.5	9	9	10.5	10.5	12	12	13.5	13.5	15	15
c	minimum		0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.3	0.3
c	maximum value		0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	1	1	1	1	1
d _a	maximum value		20.2	22.4	24.4	26.4	30.4	33.4	36.4	39.4	42.4	45.6	48.6	52.6	56.6
d_w	Class A	minimum	25.3	28.2	30	33.6	-	-	-	-	-	-	-	-	-
d_w	Class B	minimum	24.8	27.7	29.5	33.2	38	42.7	46.5	51.1	55.9	59.9	64.7	69.4	74.2
and	Class A	minimum	30.14	33.53	35.72	39.98	-	-	-	-	-	-	-	-	-
and	Class B	minimum	29.56	32.95	35.03	39.55	45.2	50.85	55.37	60.79	66.44	71.3	76.95	82.6	88.25
k	Nominal		11.5	12.5	14	15	17	18.7	twenty one	22.5	25	26	28	30	33
	Class A	minimum	11.28	12.28	13.78	14.78	-	-	-	-	-	-	-	-	-
	Class A	maximum value	11.72	12.72	14.22	15.22	-	-	-	-	-	-	-	-	-
	Class B	minimum	11.15	12.15	13.65	14.65	16.65	18.28	20.58	22.08	24.58	25.58	27.58	29.58	32.5
	Class B	maximum value	11.85	12.85	14.35	15.35	17.35	19.12	21.42	22.92	25.42	26.42	28.42	30.42	33.5
k ₁	minimum		7.8	8.5	9.6	10.3	11.7	12.8	14.4	15.5	17.2	17.9	19.3	20.9	22.8
r	minimum		0.6	0.8	0.8	0.8	1	1	1	1	1	1.2	1.2	1.6	1.6
s	max = nominal		27	30	32	36	41	46	50	55	60	65	70	75	80
	Class A	minimum	26.67	29.67	31.61	35.38	-	-	-	-	-	-	-	-	-
	Class B	minimum	26.15	29.16	31	35	40	45	49	53.8	58.8	63.1	68.1	73.1	78.1
Thousand pieces of steel weight ≈kg			-	-	-	-	-	-	-	-	-	-	-	-	-

Benifits of Grade 12.9 Hex Head Bolts

Befast’s Grade 12.9 hex head bolts deliver unmatched strength and reliability, perfect for critical applications where failure is not an option. Our advanced production equipment ensures that each bolt undergoes thorough testing to meet strict quality standards for tensile strength, fatigue, and corrosion resistance.
With our production capacity of 6,000 tons per month, we can provide large quantities of these high-strength bolts quickly, ensuring your project remains on schedule and cost-effective.

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