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Hex Flanged Bolts

A hex flange head bolt is a type of fastener that combines a hexagonal head with an integrated flange (a flat, circular bearing surface) beneath the head. The flange distributes the clamping load over a wider area, reducing the risk of damage to the mating surface and often eliminating the need for a separate washer.

King Tower offers a wide range of metric and inch sizes with many head heights and flange options.

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Custom Flange Hex Bolts

Our facilities have been producing flange hex bolts for decades and can fulfill both small and large order quantities alike. King Tower equipped with state-of-the-art equipment capable of providing various production services to produce the perfect bolt for your application. Our flange hex bolts are cold formed. With open-die cold forming, the resulting product is extra strong and extra straight at extra-long lengths.

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Material Options

Common materials include steel (grade 4.6, 8.8, 10.9, 12.9), stainless steel (A2/A4), and brass or aluminum.

Standards

Metric (ISO 4162, DIN 6921)- Common in Europe/Asia (e.g., M6, M8, M10).  
SAE/Inch (ANSI B18.2.3.6M) – Used in the U.S. (e.g., 1/4"-20, 5/16"-18).

Coatings / Finishes

Zinc-plated, black oxide, hot-dip galvanized, or other corrosion-resistant treatments like DACROMET coating, Zinc-Nickel Alloy coating

Applications

Automotive (engine components, chassis parts).

Machinery equipment assembly. 

Electrical enclosures

Manufacturing Flange Hex Bolt Type

M10 Hex Flange Bolt

Hex Flange Bolts 8.8

A2-70 Hex Flange Bolt

Black Hex Flange Bolt

Long Hex Flange Bolt

Hex Flange Bolt with Dog Point

The Application of Hex Flange Bolts in the Mechanical Equipment 

Hex flange bolts are widely recognized in mechanical engineering for their integrated flange design, which distributes clamping pressure evenly and eliminates the need for separate washers. This makes them particularly valuable in high-vibration environments, such as agricultural machinery.
We recently collaborated with a European customer specializing in farm machinery, including cultivators, mowers, and tractors. These machines operate under extreme conditions – continuous vibration, exposure to soil moisture, and varying temperatures. 
After evaluating their requirements, our customer chose our custom M8 hex flange bolts made of stainless steel 304.
Hex flange bolts are not just generic fasteners – they are engineered solutions. For agricultural machinery manufacturers, choosing the right material (e.g., stainless steel 304) and the right flange design directly improves equipment reliability and service life.
As a custom fastener factory, we don’t just sell hex flange bolts – we solve fastening challenges for real-world applications.

About King Tower

With 20+ years custom made experience, we offer the most reliable source for high quality fastener parts ranging from screws and bolts to CNC machining parts, stamping parts, and more.

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Why Choose Us

King Tower fasteners are meticulously crafted according to customer's drawings or samples to ensure that they meet precise specification. With years of production experiences and  production machines, King Tower wide diverse range of fasteners are featured with hundreds of materials, head type, thread style, size, heat treatment, plating and secondary operation.

Over 200 units Machines

King Tower equipped with different production machine contain cold heading forming machine, thread rolling machine, programmable CNC machines, automatic lathe machines, spring machine and stamping machine, and include secondary process machine like drilling machine, cutting machine and grooving machines, to meet the complex fastener production.

Diverse range of test machines

King Tower with a comprehensive array of testing machinery, that can meticulously assess various aspects, including salt spray test machine, two-dimensional image measuring instrument, hardness test machine, optical image screening machine and torque machine. King Tower used these testing equipment to thoroughly evaluate the performance, durability, and safety of their offerings.

Diversity of customized fasteners

King Tower produced screw thread diameter from 0.8mm to 20mm, length from 2mm to 400mm, with specialized material include carbon/alloy steel, stainless steel, aluminum, brass and titanium. Full rang of surface treatment including electroplating (Blue, Black, White, Yellow, Rose Gold, Silver ect.), Nickel, Passivated, DACROMET, laser engraving and vacuum coating.

Start Your Project

Get your project moving today. Contact us for a quote on a custom part, pricing, lead time, or other questions. Our team will get back to you within 1-2 hours on business days, and will be sure to route you to the best person to support your needs.

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