HEX FLANGE BOLTS

Our Metric Flange Bolts are designed for industrial fastening applications where reliable clamping, efficient assembly, and effective load distribution are important. Featuring a hexagonal head with an integrated flange beneath the head, these bolts provide a larger bearing surface than conventional hex head bolts, helping distribute the clamping load over a wider area of the joint. The integrated flange can also reduce the need for a separate washer in many suitable applications, simplifying component selection and helping improve assembly efficiency. This makes metric flange bolts a practical fastening solution for automotive components, machinery, equipment manufacturing, metal fabrication, industrial assemblies, and general engineering applications.

1035 and 1045 Carbon Steel Options

Our Metric Flange Bolts are manufactured from 1035 and 1045 carbon steel, providing cost-effective material options for different mechanical fastening requirements. 1035 carbon steel is suitable for general-purpose applications where a balance of strength, machinability, and economy is important, while 1045 carbon steel provides a higher-strength material option for applications requiring improved mechanical performance.

For metric applications, available property classes include 4.8, 6.8, and 8.8 according to ISO 898-1, allowing buyers to select the appropriate strength level according to the load and service requirements of the assembly. For customers working with inch-based fastening systems, SAE J429 Grade 2 and Grade 5 options are also available, providing additional flexibility for international sourcing.

Integrated Flange for Better Load Distribution

The defining feature of a flange bolt is the washer-like flange formed directly beneath the hexagonal head. During tightening, the flange creates a larger contact area against the mating surface, helping distribute clamping pressure and reduce localized loading around the bolt head.

This integrated design can be particularly valuable in applications where assembly speed, component reduction, and consistent fastening are important. By combining the functions of a hex head and bearing surface into one fastener, Metric Flange Bolts can help simplify assembly and reduce the number of separate components required in suitable joint designs. Their practical design makes them widely applicable to machinery, automotive and equipment assembly, metal components, brackets, frames, and industrial fastening systems.

DIN and ASME Standard Specifications

Our Metric Flange Bolts are available according to DIN 6921 for metric applications and ASME B18.2.1 for inch-series requirements. These recognized standards provide dimensional references for standardized flange and hex bolt configurations and help buyers maintain compatibility with existing fastening systems and production processes. The metric size range covers M6 to M20, while inch sizes range from approximately 1/4" to 3/4".

Black and Zinc-Plated Finishes

We offer Black and Zinc-Plated (ZP) finishes to meet different application and appearance requirements. The choice of finish allows buyers to balance surface protection, appearance, application environment, and overall purchasing cost according to the requirements of each project.

A Practical Choice for OEM and Bulk Purchasing

For OEM manufacturers, machinery companies, automotive suppliers, hardware distributors, importers, and wholesalers, sourcing efficiency is often just as important as the individual fastener specification. Our Metric Flange Bolts combine 1035 and 1045 carbon steel, ISO 898-1 strength classes 4.8/6.8/8.8, SAE J429 Grade 2/5 options, DIN 6921 and ASME B18.2.1 standards, M6–M20 and 1/4"–3/4" sizes, and Black or Zinc-Plated finishes into one flexible product range.