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Serrated Flange Bolt

Armed with teeth-like serrations, serrated flange bolts are one-piece bolts bite into surfaces to resist vibration. This bolt is identifiable by the ridge or surrounding the bolt head, this built-in washer under the head of the Bolt acts to distribute the clamping load over a greater area. A flange bolt is designed to provide the same holding power as a washer. Serrated flange bolts from Pankaj International are engineered to resist vibration and secure connections effectively. Featuring teeth-like serrations around the flange, these one-piece bolts bite into surfaces to prevent loosening. The built-in flange acts as a washer, distributing the clamping load over a larger area to enhance holding power. Ideal for applications requiring reliable, vibration-resistant fasteners, our serrated flange bolts provide robust performance and durability. As a leading fasteners manufacturer in Ludhiana, India, Pankaj International delivers high-quality bolts designed for various industrial needs.

Size Range
Diameter M8 to M20
Length 75mm to 150mm
Technical Specifications



nominal size of screw f g b u h k
Min. Max. Min. Max. Max. Min. Max. Min.
M8 0.241 0.2500 0.271 0.297 0.37 0.02 0.18 0.11
M10 0.305 0.3125 0.340 0.367 0.45 0.03 0.21 0.13
1/4 " 0.367 0.3750 0.409 0.433 0.56 0.04 0.28 0.17
5/16 " 0.489 0.5000 0.548 0.577 0.68 0.05 0.32 0.21
3/8 " 0.551 0.5625 0.618 0.650 0.81 0.06 0.39 0.25
7/16 " 0.612 0.6250 0.685 0.722 0.93 0.07 0.46 0.30
1/2 " 0.736 0.7500 0.825 0.866 1.07 0.08 0.51 0.34
5/8 " 0.922 0.9375 1.034 1.083 1.33 0.10 0.62 0.42
3/4 " 1.100 1.1250 1.234 1.299 1.59 0.11 0.73 0.51



Serrated Flange Bolt: Key Features and Applications


Serrated flange bolts are designed to provide a secure, vibration-resistant fastening solution for a wide range of industrial and structural applications. Featuring a unique serrated flange that grips the surface and prevents loosening, these bolts are essential for applications where reliability and stability are crucial. At Pankaj International, we manufacture high-quality serrated flange bolts that meet rigorous industry standards, ensuring durability and performance under demanding conditions.


The defining feature of serrated flange bolts is their serrated, or toothed, flange. This design enhances the bolt's ability to resist loosening due to vibrations or dynamic loads. The serrations create a mechanical lock between the bolt and the surface, increasing friction and preventing the bolt from turning or backing out over time. This makes serrated flange bolts particularly useful in applications where vibrations are common, such as in automotive assemblies, machinery, and structural connections.


Manufactured from high-strength materials such as alloy steel and stainless steel, serrated flange bolts offer excellent tensile strength and resistance to wear. These materials ensure that the bolts can handle significant loads and stresses while maintaining their structural integrity. Additionally, our serrated flange bolts are available with various surface treatments, including zinc plating and hot-dip galvanization, to enhance their resistance to corrosion and extend their service life. This makes them suitable for both indoor and outdoor environments, where exposure to moisture and other corrosive elements is a concern.


In conclusion, serrated flange bolts are essential for applications requiring secure and vibration-resistant connections. Their unique serrated flange design provides a reliable solution for preventing loosening and maintaining stability in demanding environments. At Pankaj International, we are committed to producing high-quality serrated flange bolts that meet the highest standards of performance and durability. For reliable fastening solutions that can withstand vibrations and dynamic loads, contact us today to explore our range of fasteners and discover how we can support your specific needs.

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Pankaj International is an ISO Certified Nationwide Manufacturer of Stocked and Custom Nuts, Bolts and Fasteners

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