Handan Yongnian Hongji Machinery Parts Co., LTD.,

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+86 155 3000 9000

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Grade 8.8 Black Oxide Flat Head Hex Socket Screw DIN7991

Product name：Grade 8.8 black oxide flat head hex socket screw DIN7991
Head type：Hex Socket Flat Head screw
Grade：8.8
Size：M3-M30
Packing：bulk packing in cartons, then put on pallets, or as per your requests.
Price Term：FOB,EXW,CIF,DAP ect
Delivery method：by sea, by air or by express service
Certificate：ISO9001
Standard：DIN

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产品描述

Description

Product Dimensions

d		M3	M4	M5	M6	M8	M10	M12	(M14)	M16	(M18)	M20	(M22)	M24
d
P	Pitch	0.5	0.7	0.8	1	1.25	1.5	1.75	2	2	2.5	2.5	2.5	3
α	tol.(+2)	90°	90°	90°	90°	90°	90°	90°	90°	90°	90°	90°	60°	60°
b	L≤125mm	12	14	16	18	22	26	30	34	38	42	46	50	54
	125＜L ≤ 200	/	/	/	24	28	32	36	40	44	48	52	56	60
	L＞200	/	/	/	/	/	45	49	53	57	61	65	69	73
dk	Max=Nominal	6	8	10	12	16	20	24	27	30	33	36	36	39
dk	Min	5.7	7.64	9.64	11.57	15.57	19.48	23.48	26.48	29.48	32.38	35.38	35.38	38.38
ds	Max=Nominal	3	4	5	6	8	10	12	14	16	18	20	22	24
ds	Min	2.86	3.82	4.82	5.82	7.78	9.78	11.73	13.73	15.73	17.73	19.67	21.67	23.67
e	Min	2.3	2.87	3.44	4.58	5.72	6.86	9.15	11.43	11.43	13.72	13.72	16	16
k	Max	1.7	2.3	2.8	3.3	4.4	5.5	6.5	7	7.5	8	8.5	13.1	14
s	Nominal	2	2.5	3	4	5	6	8	10	10	12	12	14	14
	Min	2.02	2.52	3.02	4.02	5.02	6.02	8.025	10.025	10.025	12.032	12.032	14.032	14.032
	Max	2.1	2.6	3.1	4.12	5.14	6.14	8.175	10.175	10.175	12.212	12.212	14.212	14.212
t	Max=Nominal	1.2	1.8	2.3	2.5	3.5	4.4	4.6	4.8	5.3	5.5	5.9	8.8	10.3
t	Min	0.95	1.55	2.05	2.25	3.2	4.1	4.3	4.5	5	5.2	5.6	8.44	9.87

Product Details

DIN7991 countersunk hexagon socket screw, the head is conical, the middle is a recessed hexagon, the screw head can be embedded in the mounting surface after installation, the surface is smooth and beautiful. The head of countersunk hexagon socket screw can be embedded in the component, and can apply larger torque, and the connection strength is higher. It can replace the hexagon socket bolt. Often used in the structure of compact, smooth appearance of the joint. DIN7991 hexagon socket countersunk head screw is A reference to German standard DIN7991-1986, which specifies the thread specification from M3 -- M24 ISO metric thread, product grade A hexagon socket countersunk head screw.

DIN7991 hexagon socket countersunk head screws are available in carbon steel and stainless steel. The performance grades of carbon steel hexagon socket countersunk head screws are 8.8, 10.9, 12.9, the standard can refer to GB3098.1. Carbon steel materials generally need surface treatment, common is oxidation, electroplating, such as the need for other surface coating or surface treatment, can also be negotiated. Stainless steel hexagon socket countersunk head screws commonly used on the market are made of SUS304 and SUS316, stainless steel material corrosion resistance and heat resistance are strong. SUS304 medium work hardening rate, suitable for general cold work and stretching; The CORROSION RESISTANCE OF SUS316 IS BETTER THAN THAT OF 304. It IS ESPECIALLY suitable FOR Marine and chemical media. It has better corrosion resistance and hole corrosion resistance.

Hexagon socket screws are divided into cylindrical head hexagon socket bolts according to the head, which is commonly used, and it also has many kinds, according to the material, there are iron, that is, carbon steel and stainless steel. Stainless steel hex bolts also have stainless steel 304 and 202 and so on material. Semi - round head hex socket bolt, this also have called pan head hex socket bolt. Countersunk head hex socket bolt, head is flat head, inside is hex socket. There is a kind of national standard is more special, called headless hexagon bolt. Which is what we often call the meter screw, the payment screw, the set screw. These are common terms for headless hex bolts, but they all mean the same thing. Of course, there are also some bolts with flowered inner hexagon head. This use is less, the market is also basically difficult to see. Hexagon socket screw although the variety of national standards are also more, but basically some more special, basically few people will go to use on the market. Used more or number of cylindrical head hex socket screws, also known as cylindrical head hex socket screws.

Product Packaging

About Us

FAQ

1.You are a manufacturing company or trading company?

We are a fastener manufacturer, and our main products are Bolt, Nut, Screw, Anchor and Washer. Meanwhile, we are also a fastener trader with many years experiences in domestic and international market.

2.What quote do you offer?

We offer EXW, FCA(Guangzhou, Foshan, Yiwu, Shanghai, Wenzhou, Urumchi, and many other cities), FOB, CIF, CFR, DAP, DDP sea shipment terms.

3. Can you provide the necessary customs clearance documents

Yes. We are a legal and compliant enterprise of the People's Republic of China, having the formal import and export qualification. FORM E, CO, Invoice with embassy certification are all available for our order.

4.How pay?

T/T, Alibaba Online Payment, Paypal are all available.

5.How transport?

The most common means is sea shipment, if the order quantity is great, this means is the best.

But if the order quantity is little, we advise the air express or air transportation.

Of course, the land transportation is also OK.

Door to Door is also available.

6.Can I order a small list ?

Of course you can. We offer the samples service.

7.Can we print our own logo ?

Yes. We offer the customized service based on a big quantity. OEM and ODM are OK.

Send Email

Taylor@hdhongji.com

Phone/Wechat

+86 155 3000 9000

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