Hexagon Head Bolts with Flat Flange

Hexagon head bolts with flat flange, like ordinary hexagon head bolts, have hexagonal heads, which is convenient for your installation. There is a flat flange plate under its bolt head. This flange plate is like a flat gasket growing directly on the bolt.

Product applications and parameters

The hexagon head bolts with flat flange has a most special design, that is, its flat flange. This flat flange plate fits closely with the connected object and has a large contact area. Just like standing on a big foot is more stable than on a small one, with a larger contact area, the force can be distributed more evenly after the bolt is tightened, avoiding excessive pressure at a certain point that may deform the material. It can be used to connect metals and other materials.

Hexagon head bolts with flat flange can be used to fix the interior panels. The flat flange can be stably installed beneath the decorative strip, and the stainless steel material can resist salt spray. Although not suitable for the hull, it is very suitable for installation beneath a neat deck.

Product features

The large flange plate of the hexagon head bolts with flat flange increases the contact area with the connected object. When you tighten it, its force can be distributed more evenly. Thus, the connection is very firm and not easy to loosen. It can better resist vibration, thereby reducing subsequent maintenance.

Product Material

The main materials used for Hexagon Head Bolts with Flat Flange include carbon steel, stainless steel, and alloy steel. Carbon steel is the most common option, cost-effective and suitable for general indoor applications where there’s no heavy moisture. Stainless steel, usually 304 or 316 grade, is used for environments with high humidity, corrosion risks, or outdoor use—like marine equipment or coastal construction. Alloy steel variants are designed for high-strength requirements, such as in heavy machinery or automotive engines that bear large loads. Some bolts also have surface treatments, like zinc plating or galvanizing, to enhance rust resistance. The material selection depends on the application scenario: for dry, low-load situations, carbon steel works; for corrosive or high-load environments, stainless steel or alloy steel is better. Each material has its own processing characteristics, but all meet basic strength standards to ensure the bolts hold components securely.

Q&A Session

What’s the difference between Hexagon Head Bolts with Flat Flange and regular hexagon bolts?

The key difference of Hexagon Head Bolts with Flat Flange is the integrated flat flange under the bolt head, which acts as a built-in washer. This design distributes pressure evenly on connected surfaces and prevents loosening from vibration, so no extra washers are needed. Regular hexagon bolts require separate washers for the same effect. Also, the flat flange improves connection stability, making these bolts more suitable for automotive and machinery assembly where firm fastening is required.