DIN7991 Hex Socket Countersunk Screws Self-Drilling Flat Head Screws From Chinese Direct Factory

• Customization: Available
• Material: High Strength Steel
• Type: Countersunk Head
• Model NO.: DIN7991-4
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN, GB, ANSI, BSW
• Grade: 10.9
• Surface: Black, Blue-White Zinc-Plated
• Finsh: Zn
• Gr: 8.8 /10.9/ 12.9
• Range: M3-M64
• Packing: 25kg Bulk Packing
• Label: OEM
• with Pallet: Yes
• Application: Furniture, Construction, Industry, Machinery, etc
• Transport Package: Wooden Pallet Packing
• Specification: M3-M64
• Trademark: N/M
• Origin: China
• HS Code: 7318150000
• Production Capacity: 60000/Ton/Year
• Package Size: 45.00cm * 35.00cm * 35.00cm
• Package Gross Weight: 25.000kg

Product Description

DIN7991 Hex Socket Countersunk Screws Self-drilling Flat Head Screws from Chinese Direct Factory

 

 

Product Parameters

 

Material	Alloy Steel
Grade	8.8, 10.9, 12.9
Finish	Plain(Black oxide), Zinc Plated(White/Yellow), H.D.G and etc.
Thread	Metric, UNC, UNF, BSW
Standard	ISO, DIN, ASME, JIS, BS and Non-standard
Packing	1. Bulk in cartons (25-30kg Max.)+wooden pallet                                    2. Small Boxes into outer carton + wooden pallet 3. According to customer special demand
LeadTime	30-45 work days after order confirmed

 

Manufacturing Process

How to make a socket head cap screw ?
 

 * After acid cleaning,we will delivery to the wire Drawing workshop for Drawing.

 * Then transfer to the cold heading machine to make the hexagon head.(here we can do the head marking, Knurling or not Knurling here).  if over M24, our machine will very biggest, you see~~
 

Socket head cap screw DIN912 before thread rolling

Thread rolling 

* Then send to the heat treatment workshop to do the most important step--Heat treatment and with black. 
 

 Znic plated products are processed in plating factory.
HRC Test is applied for quality control.

 

HRC PERFECT!! Free samples can be sent to customerrs for quality check if needed.
  

Packaging & Shipping

Ordinary package: 25kg bulk packing /  small box inner carton, OEM accepted.
Label: as customer request.
Port of loading: Shanghai, China
 

 

Company Profile

    Hunan Gurth Technology Co., Ltd is specialized in R&D and manufacturing of fasteners with 2 production bases in Wenzhou and Hunan, with a number of experts and technicians engaged in hardware industries for more than 20 years. Our main products include:

[ Socket head cap screw DIN912 8.8,10.9,12.9 ]
[ Set screw Din916 DIN913,DIN914 ]
[ Flat cap screw DIN7991 ]
[ Button cap screw ISO7380 ]
[ Hex bolts DIN933,DIN931 8.8,10.9,12.9 ]
[ Flange bolts DIN6921 ]
[ Nut DIN934,DIN982,DIN985,DIN6923 ]
[ Anchor ]
[ Rod thread ]
[ Washer ]

   Through the years, we are consistently committed to supporting clients with better quality and price. We look forward to cooperating with distributors and dealers in each territory.