DIN7991 hexagon socket countersunk screws are made of carbon steel and stainless steel.
The performance grades of carbon steel hexagon socket countersunk screws are 8.8, 10.9, and 12.9. The standard can refer to GB3098.1.
The head of the bolt is designed as a flat head with a countersunk chamfer, so that it can sink below the surface of the connected part after installation, achieving a smooth transition without protruding or interfering with the surrounding surface.
The middle of the head is a recessed hexagon, presenting an inverted triangle, which is a tool slot for tightening with a hexagonal wrench or screwdriver.
The pitch refers to the distance between two adjacent lines on the thread. Common pitch sizes are 0.7mm, 0.8mm, 1.0mm, etc.
For carbon steel hexagon socket countersunk bolts, common surface treatments include oxidation, electroplating, etc., as well as black boiling, galvanizing, non-electrolytic zinc flake coating, thick galvanized VZD, thick galvanized plus sealed (ZSML), zinc-nickel coated silver (ZNSHL), zinc-nickel coated black (ZHBHL), etc.
Products Data
| DIN Number | DIN7991 |
| Type | CSK Flat Head Hex Socket Bolt |
| Head Design | Flat with Countersunk (CSK) |
| Drive Type | Hex Socket (Allen Key) |
| Material | Carbon Steel or Stainless Steel |
| Carbon Steel Grades | 8.8, 10.9, 12.9 (According to GB3098.1) |
| Stainless Steel Types | SUS304, SUS316 |
| Surface Treatment | Oxidation, Electroplating, Blackening, Zinc Plating, etc. |
| Size Range | Various diameters (e.g., M4, M5, M6), pitches, and lengths |
| Angle Options | 90°, 60°, 82°, 100°, 110°, 120° (Depending on application) |
Products display
DIN 7991 Hex Socket Countersunk Head Cap Bolt
Why Choose GNEE
GNEE is a company with more than 16 years of experience in the fastener industry. We can provide you with professional services and products.
Our main products include: embedded anchors, embedded anchors with lip, hexagonal bolt sleeve anchors, sleeve anchors with flange nuts, chemical anchors, wedge anchors, short bolts.
OEM and ODM order are accepted, Any kind of logo printing or design are available.
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