What Are DIN7991 Hexagon Socket Countersunk Bolts?

The DIN7991 specification refers to hexagon socket countersunk head bolts (also known as flat-head socket cap screws). These bolts are designed to fit flush or below the surface of the part they are inserted into, thanks to their countersunk head design.

As one of the leading fastener suppliers, Xinchi is glad to introduce a more detailed look at the DIN7991 hexagon socket countersunk bolts.

Design Of DIN7991 Hexagon Socket Countersunk Head Bolts

Head: These bolts feature a countersunk (conical-shaped) head which allows them to lay flat with the surface of the material they are fastened into. The head includes a hexagonal socket for an Allen key or hex wrench.

Drive: The hexagonal socket drive is designed to accommodate a hex key, which allows for higher torque application compared to standard screws, and provides a clean head surface after installation.

Materials Of DIN7991 Hexagon Socket Countersunk Head Bolts

DIN7991 bolts can be made from various materials, including carbon steel, stainless steel, and alloy steel, each providing different levels of strength, corrosion resistance, and suitability for different environments and applications.

Sizes and Dimensions Of DIN7991 Hexagon Socket Countersunk Head Bolts

These bolts come in a range of sizes, typically specified by the diameter and length of the bolt. The diameter can vary from small sizes used in precision applications to larger diameters suited for heavy-duty fastening.

The length of the bolt is usually measured from the point to the underside of the head, considering that the head is countersunk.

Xinchi is a trustworthy fastener company, especially in furniture nuts. We have a factory,  founded in 2007(Factory Video). And we are the designated fastener supplier to“STAPLE”. As a trusted fastener supplier,  Xinchi can offer a wide range of high-quality fasteners, including T nuts, screws, bolts, rivets, washers, etc. If you want to know more about fasteners or want to wholesale fasteners, please feel free to contact us. And then our experienced and expert service team will reply to you as soon as possible.