DIN 912, describes high-strength bolts with a cylinder head structure and hexagon (hexagon) key slot. Widely used in the industry “Imbus Bolt” or “Allen Head Bolt” known as a countersunk bolt. The main advantage of these bolts is that the head can be completely recessed into the countersunk slot cut into the mounting surface, resulting in a smooth and protrusion-free surface. Since the key opening is inside the bolt, it provides ease of installation in narrow spaces where it is not possible to enter the key from the outside. It is produced especially in high strength classes such as 8.8, 10.9 and 12.9 and is indispensable in machine manufacturing.
| Feature | |
| Standard | DIN 912 |
| Material | Carbon Steel, Alloy Steel, Stainless Steel |
| Type | Imbus Bolt |
| Quality | 8.8, 10.9, 12.9, A2, A4, B7, L7 |
| Coating | Electrogalvanized (White/Yellow), Hot-Dip Galvanized (HDG), Nickel, Black Oxide, Geomet |
| Tooth Type | Metric (Coarse) – UNC / UNF (optional) |
| Measurement Range | M4 to M64, 1/2″-2 1/2″ |
| Production Method | Cold forging, hot forging, or machining |
| Thread Direction | Right-Hand Thread (standard) / Left-Hand Thread (upon request) |
- Machine manufacturing and assembly lines
- Injection and casting molds (Molding)
- Automotive engine and chassis connections
- Precision engineering and robotics
- Mechanisms with narrow mounting space
- Joints requiring high torque
- ISO 9001:2015 Quality Management System
- ISO 14001:2015 Environmental Management System
- ISO 45001:2018 Occupational Health and Safety Management System
- EU Declaration of Conformity (PED) certificate (Compliance with the Pressure Equipment Directive)
- Our production processes, DIN, EN, ISO, and ASTM is fully compliant with the standards
- Upon request EN 10204 3.1 certificate is provided
The most important reasons are “space saving” and “high torque”. To tighten a hexagon head bolt, a large space is needed for the wrench to enter from the outside. With an imbus bolt, there is no need for a gap on the sides of the bolt as the wrench enters from the inside. It also withstands heavy loads because it is produced in very high grades such as 12.9.
Indicates that the tensile strength of the bolt is very high. It is the hardest and most durable standard bolt grade on the market. In molding and heavy machinery, this grade is preferred to minimize the risk of breakage.
Usually grade 12.9 imbus bolts are sold with a “Black Oxide” coating and oiled. This coating provides protection only for storage and light ambient conditions. If it is to be used outdoors or in humid places, galvanized, geometric coating or stainless steel should be preferred.
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