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Grade 4.8 Hex Head Bolts

Name: Grade 4.8 Hex Head Bolts
Brand: Befast Co., Ltd.

Grade 4.8 hex head bolts are widely used in construction, machinery, and automotive applications due to their moderate strength and cost-efficiency. These bolts are designed to withstand everyday mechanical stress, offering reliable performance in general fastening tasks.

Manufactured from carbon steel and treated for durability, Grade 4.8 bolts provide a good balance of strength and affordability. These bolts are ideal for applications that require dependable, medium-strength fastening without breaking the bank.

Products

Specifications of Grade 4.8 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 4.8 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	Thread Pitch		0.35	0.4	0.45	0.5	0.6	0.7	0.8	1	1	1.25	1.5	1.75
b	Ref.	L≤125	9	10	11	12	13	14	16	18	20	22	26	30
		125＜L≤200	-	-	-	-	-	-	22	24	26	28	32	36
		L＞200	-	-	-	-	-	-	-	-	-	-	45	49
c	min		0.1	0.1	0.1	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15
	max		0.25	0.25	0.25	0.4	0.4	0.4	0.5	0.5	0.5	0.6	0.6	0.6
da	max		2	2.6	3.1	3.6	4.1	4.7	5.7	6.8	7.8	9.2	11.2	13.7
ds	max=nominal size		1.6	2	2.5	3	3.5	4	5	6	7	8	10	12
	min	Grade 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
	min	Grade B	-	-	-	-	-	-	-	-	-	-	-	-
dw	min	Grade 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
	min	Grade B	-	-	-	-	-	-	-	-	-	-	-	-
e	min	Grade 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
	min	Grade B	-	-	-	-	-	-	-	-	-	-	-	-
k	Nominal Size		1.1	1.4	1.7	2	2.4	2.8	3.5	4	4.8	5.3	6.4	7.5
	Grade A	min	0.98	1.28	1.58	1.88	2.28	2.68	3.35	3.85	4.65	5.15	6.22	7.32
	Grade A	max	1.22	1.52	1.82	2.12	2.52	2.92	3.65	4.15	4.95	5.45	6.58	7.68
	Grade B	min	-	-	-	-	-	-	-	-	-	-	-	-
	Grade B	max	-	-	-	-	-	-	-	-	-	-	-	-
k1	min		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	min		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 size		3.2	4	5	5.5	6	7	8	10	11	13	17	19
	min	Grade 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
	min	Grade B	-	-	-	-	-	-	-	-	-	-	-	-
Length of Thread 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	Thread Pitch		2	2	2.5	2.5	2.5	3	3	3.5	3.5	4	4
b	Ref.	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	min		0.15	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.3
	max		0.6	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	1
da	max		15.7	17.7	20.2	22.4	24.4	26.4	30.4	33.4	36.4	39.4	42.4
ds	max=nominal size		14	16	18	20	22	24	27	30	33	36	39
	min	Grade A	13.73	15.73	17.73	19.67	21.67	23.67	-	-	-	-	-
	min	Grade B	-	15.57	17.57	19.48	21.48	23.48	26.48	29.48	32.38	35.38	38.38
dw	min	Grade A	20.5	22.5	25.3	28.2	30	33.6	-	-	-	-	-
	min	Grade B	-	22	24.8	27.7	29.5	33.2	38	42.7	46.6	51.1	55.9
e	min	Grade A	24.49	26.75	30.14	33.53	35.72	39.98	-	-	-	-	-
	min	Grade B	-	26.17	29.56	32.95	35.03	39.55	45.2	50.85	55.37	60.79	66.44
k	Nominal Size		8.8	10	11.5	12.5	14	15	17	18.7	21	22.5	25
	Grade A	min	8.62	9.82	11.28	12.28	13.78	14.78	-	-	-	-	-
	Grade A	max	8.98	10.18	11.72	12.72	14.22	15.22	-	-	-	-	-
	Grade B	min	-	9.71	11.15	12.15	13.65	14.65	16.65	18.28	20.58	22.08	24.58
	Grade B	max	-	10.29	11.85	12.85	14.35	15.35	17.35	19.12	21.42	22.92	25.42
k1	min		5.96	6.8	7.8	8.5	9.6	10.3	11.7	12.8	14.4	15.5	17.2
r	min		0.6	0.6	0.6	0.8	0.8	0.8	1	1	1	1	1
s	max=nominal size		22	24	27	30	32	36	41	46	50	55	60
	min	Grade A	21.67	23.67	26.67	29.67	31.61	35.38	-	-	-	-	-
	min	Grade B	-	23.16	26.16	29.16	31	35	40	45	49	53.8	58.8
Length of Thread b			-	-	-	-	-	-	-	-	-	-	-

Full Thread Hexagon Head Bolts Grade A and B DIN 933

Screw Thread			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	max		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	min		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	max		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
da	max		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
dw	Grade A	min	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
dw	Grade B	min	-	-	-	-	-	5.7	6.7	8.7	9.4	11.4	15.4	17.2	20.1	22
e	Grade A	min	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
e	Grade B	min	-	-	-	-	-	7.5	8.63	10.89	11.94	14.2	18.72	20.88	23.91	26.17
k	Nominal Size		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
	Grade A	min	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
	Grade A	max	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
	Grade B	min	-	-	-	-	-	2.6	3.26	3.76	4.56	5.06	6.11	7.21	8.51	9.71
	Grade B	max	-	-	-	-	-	3	3.74	4.24	5.04	5.54	6.69	7.79	9.09	10.29
k1	min		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	min		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 size		3.2	4	5	5.5	6	7	8	10	11	13	17	19	22	24
	Grade A	min	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
	Grade B	min	-	-	-	-	-	6.64	7.64	9.64	10.57	12.57	16.57	18.48	21.16	23.16
Weight of per 1000 steel products(≈kg)			-	-	-	-	-	-	-	-	-	-	-	-	-	-

Screw Thread			(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	max		7.5	7.5	7.5	9	9	10.5	10.5	12	12	13.5	13.5	15	15
c	min		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	max		0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	1	1	1	1	1
da	max		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
dw	Grade A	min	25.3	28.2	30	33.6	-	-	-	-	-	-	-	-	-
dw	Grade B	min	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
e	Grade A	min	30.14	33.53	35.72	39.98	-	-	-	-	-	-	-	-	-
e	Grade B	min	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 Size		11.5	12.5	14	15	17	18.7	21	22.5	25	26	28	30	33
	Grade A	min	11.28	12.28	13.78	14.78	-	-	-	-	-	-	-	-	-
	Grade A	max	11.72	12.72	14.22	15.22	-	-	-	-	-	-	-	-	-
	Grade B	min	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
	Grade B	max	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
k1	min		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	min		0.6	0.8	0.8	0.8	1	1	1	1	1	1.2	1.2	1.6	1.6
s	max=nominal size		27	30	32	36	41	46	50	55	60	65	70	75	80
	Grade A	min	26.67	29.67	31.61	35.38	-	-	-	-	-	-	-	-	-
	Grade B	min	26.15	29.16	31	35	40	45	49	53.8	58.8	63.1	68.1	73.1	78.1
Weight of per 1000 steel products(≈kg)			-	-	-	-	-	-	-	-	-	-	-	-	-

Benifits of Grade 4.8 Hex Head Bolts

Befast's Grade 4.8 hex head bolts stand out for their consistent quality and durability, thanks to advanced production techniques. With a monthly production capacity of 6,000 tons, we ensure timely and reliable delivery for large-scale projects, minimizing production delays.
Our Grade 4.8 bolts undergo rigorous quality control processes, including mechanical testing and dimensional accuracy checks, guaranteeing that every bolt meets international standards. These bolts offer excellent value, making them a cost-effective solution for large orders.

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