Wholesale Price DIN 931 Black Oxide Carbon Steel Hex Hexagon Bolt M8

Product Description

Wholesale Price DIN 931 Black Oxide Carbon Steel Hex Hexagon Bolt M8

Black Oxide Carbon Steel Hex Head Bolt
Material:	Carbon Steel, Stainless Steel, Brass etc.
Standards:	GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS, ETC
Size:	M4-M100 or non-standard asa request & design
Finish:	Plain, Black, Zinc, Yellow Zinc, HDG, Dacromet, etc.

Screw Thread d		M42	(M45)	M48	(M52)	M56	(M60)	M64	(M68)	M72
P	Pitch	4.5	4.5	5	5	5.5	5.5	6	6	6
b	L≤125	90	96	102	-	-	-	-	-	-
	125	96	102	108	116	124	132	140	148	156
	L>200	109	115	121	129	137	145	153	161	169
c	min	0.3	0.3	0.3	0.3	-	-	-	-	-
	max	1	1	1	1	1	1	1	1	1
da	max	45.6	48.6	52.6	56.6	63	67	71	75	79
ds	max=nominal size	42	45	48	52	56	60	64	68	72
	min	41.61	44.38	47.38	51.26	55.26	59.26	63.26	67.26	71.26
dw	min	60.6	64.7	69.4	74.2	78.7	83.4	88.2	92.9	97.7
e	min	71.3	76.95	82.6	88.25	93.56	99.21	104.86	110.51	116.16
k	Nominal Size	26	28	30	33	35	38	40	43	45
	max	26.42	28.42	30.42	33.5	35.5	38.5	40.5	43.5	45.5
	min	25.58	27.58	29.58	32.5	34.5	37.5	39.5	42.5	44.5
k1	min	17.9	19.3	20.9	22.8	24.2	26.2	27.6	29.8	31.2
r	min	1.2	1.2	1.6	1.6	2	2	2	2	2
s	max=nominal size	65	70	75	80	85	90	95	100	105
	min	63.1	68.1	73.1	78.1	82.8	87.8	92.8	97.8	102.8

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: DIN933, DIN931, DIN912, DIN603, DIN7985, DIN7991, DIN6921, ASME/ANSI B 18.2.1, ASME/ANSI B18.2.3.1 M, GB, BSW, ISO Hex bolt, carriage bolt, heavy hex bolt, flange head bolt, anchor bolt, etc

: DIN934, DIN6923, DIN985, ISO4032 hex heavy hex nut, 2H nut, A563 / A563M cap nut, nylon nut, etc

: threaded rod DIN975,DIN976, threaded bar DIN975 stud bolt, B7 stud bolt ect

: hex screw, DIN912; self-drilling screw, DIN7504; self-tapping screw, DIN7981/7982; drywall screw, pan head screw, button head screw, machine screw, chipboard screw, furniture screw, wood screw, etc

: flat washer DIN125, spring washer DIN127, lock washer, square washer, spring lock washer, plain washer, etc

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FAQ

Q1: What thread standards do you follow?

A1: Our screws comply with DIN, ISO, ANSI, and JIS standards, and can also be customized according to customer drawings.

Q2: What stainless steel grades do you supply for bolts?

A2: We supply multiple grades including A2-70, A2-80, A4-70, A4-80, 304, 316, and 410SS, suitable for different mechanical strength and corrosion-resistance requirements.

Q3: Do you provide samples before mass production?

A3: Yes, we offer free or low-cost samples for quality and dimension confirmation prior to order.

Q4: How do you control product quality?

A4: Every batch is tested for torque, hardness, thread precision, and salt spray corrosion resistance, following ISO 9001 quality system standards.

Q5: Do you offer OEM or customized production?

A5: Yes. We can produce screws according to samples, technical drawings, or specific drive/head combinations, and offer custom packaging and labeling.

Q6: What is the difference between A2 and A4 stainless steel bolts?

A6: A2 (304) is ideal for standard outdoor and industrial use, while A4 (316) contains molybdenum, offering higher corrosion resistance for marine, chemical, and salt-spray environments.

Q7: Will stainless steel bolts rust over time?

A7: Under severe chemical or chloride exposure, A2 may develop slight surface corrosion. A4/316 performs better in harsh environments. We also offer passivation treatment for enhanced protection.