Custom DIN6921 Hex Head Flange Bolt

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Advantages of the Hex Head Flange Bolt: A common bolt has a thick head which makes it hard to change shape.

In the case of vibration after bolt installation, re-tightening is required. A flange bolt has a thin part that can change shape a little bit for better locking.

Besides, after a common bolt is screwed inside a hole, no tools can be used. A flange bolt has a smaller head under which there is a flange plate for fastening, and a dedicated tool can be used inside the hole, with the same theory as the hex socket bolt.

A flat gasket for the flange head makes the use of a hex head flange bolt safer on a soft material without high abrasion resistance, leading to no perforation.


An introduction to the hex head flange bolt

Based on German standards, the DIN6921 hex head flange bolt is a kind of fastener which is composed of a hex head, a flange plate (the gasket under the hex head is fixed to it) and a screw bar (a cylinder with external threads), and used together with a nut for fastened connection between two parts with through holes.

The hex head flange bolt functions to ease the trouble of manually adding a flat gasket in subsequent installation by replacing its use.

With its head composed of a hex head and a flange face, the hex head flange bolt has a higher “ratio between the support area and the stress area” than a common hex head bolt, so it can take a higher pre-tightening force and has better looseness protection.

Therefore, hex-head flange bolts are widely used for automobile engines and heavy machinery.

With a hole on its head and threads on its rod, the hex head flange bolt can be locked mechanically, with reliable looseness protection.

Shenzhen Yijin Hardware Co., Ltd. is a company that manufactures fasteners up to DIN, UNI, SFS, ANSI, BS, JIS, ISO, and GB standards and custom nonstandard special fasteners based on customer requirements, with customers all over the world such as European and American companies, big and medium-sized Chinese companies, and foreign-invested companies.

Yijin Hardware is also praised by customers for its powerful delivery capabilities and systematic fastener solutions, with products widely used in various industries such as electronics, machinery, wind power, automobiles, high-speed trains, constructions, ships, and new energies.

The fastener materials include carbon steel, alloy steel, stainless steel, copper, nylon, and plastics. The bolt strength grades are 4.8, 6.8, 8.8, 10.9 and 12.9, the nut strength grades are 4, 6, 8 and 10, and the stainless steel strength grades are A2-70 and A4-80.

Based on its customers’ production requirements, Yijin Hardware is capable of performing the following surface treatments: white zinc plating, yellow zinc plating, black zinc plating, tin plating, nickel plating, copper plating, Dacromet, mechanical zinc plating, hot-dip galvanizing, Geomet, Magni, and environmental surface treatments.

Sticking to the business philosophy of Surviving on Quality, Developing by Technologies, and Striving for Customer Satisfaction. Yijin Hardware has been working hard to be an excellent industrial product supplier.

Recommended: 2023 Top 10 Flange Bolt And Flange Nut Suppliers In China

Standard Dimensions of the Hex Head Flange Bolt

Purposes of the Hex Head Flange Bolt

As very popular industrial instrument tools, the hex head flange bolts are widely used for roads and railway bridges as well as civic and industrial buildings and heavy machinery such as cranes and excavators, because of their features like decorative accuracy and high endurance.

As the market demand changes, various new types of hex-head flange bolts have been derived.

For example, the cross recess hex head bolt is a supplement to the hex head flange bolt. Now let’s talk about the hex head flange screw’s basic specifications and purposes.

The hex head bolt is one of the most widely used bolts. Grades A and B bolts are used for important occasions with high assembly precision requirements and large impacts, vibrations, or alternating loads, while grade C bolts are used for occasions with rough surfaces and without high assembly precision requirements.

The hex head flange bolt usually has regular threads, and the bolts with fine regular threads have good self-locking and are mainly used for the parts with thin walls or occasions subjected to large impacts, vibrations, or alternating loads. A hex head flange bolt normally has threads partially.

The bolts with full threads are mainly used for occasions requiring shorter nominal bolt lengths and longer bolt threads.

As a fastener manufacturer integrating production with sales, Yijin Hardware provides both standard and custom hex head flange screws for various customers, including the world-famous new energy electromobility brand Tesla.

In terms of both production capabilities and quality guarantee, Yijin Hardware is a world-leading fastener factory up to the first class standards!


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