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Serrated Flange Hex Lock Nuts

China supplier Xiaoguo® Serrated Flange Hex Lock Nuts prevent loosening and need no extra washers. We support wholesale with stable quality and on-time delivery.The serrated base resists vibration, and the built-in flange makes installation faster. These metric-size nuts have consistent threads that fit standard bolts. They work well in machinery, automotive and construction projects, and we can support your long-term bulk buying needs.

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Product Description

Introduction

（1）Focus on function and feel

These are Serrated Flange Hex Lock Nuts, a solid choice for any fastening job. You’ll spot the built-in flange right away, which acts like a permanent washer. This helps spread out the clamping load so you don't damage your surfaces. The real magic is in the serrations on that flange. When you tighten these down, those teeth grip the mating surface. They create a friction lock that stands up to serious vibration. You won't need to grab a separate lock washer for these, as they do it all in one piece. They are pretty straightforward to install with a standard socket.

（2）Focus on application and installation

If you are working on equipment that shakes or moves, take a look at Serrated Flange Hex Lock Nuts. They are designed for environments where standard nuts just spin loose over time. The serrated portion bites into the material underneath, providing that extra holding force. You drive them on just like a regular nut, using the same tools. Because the flange is there, you get a nice, big contact area. This makes them a common pick for automotive panels or mounting brackets. Just spin them down to the specified torque, and the grip is set.

（3）Focus on problem-solving

Nobody likes finding a loose fastener. Serrated Flange Hex Lock Nuts are made to solve that exact problem. They combine three features into one simple piece of hardware. You get the nut body, a built-in washer from the flange, and a locking mechanism from the serrations. Those serrations are the key part; they dig in slightly to prevent the nut from turning back. This means you often don't need to bother with liquid adhesives or extra toothed washers. They are a very common item in any mechanic's toolbox for quick, reliable repairs.

Serrated Flange Hex Lock Nuts

Product Material and Application

Material	Where You Usually See It
Low Carbon Steel / 1010	You will find it on items such as lawn mowers or go-karts. It has a soft texture, is easy to screw, is hard enough to hold tight, and is coated with a simple anti-rust layer to prevent rusting in a dry indoor environment.
Medium Carbon Steel	These serrated flange hexagonal locking nuts can be used on automotive suspension components or trailer hitches. The steel used for them has undergone heat treatment, so the serrated structure can firmly engage without breaking. They can withstand vibrations during highway driving or heavy loads without loosening. Usually, they are coated with a thicker zinc layer.
Stainless Steel (304 / 18-8)	Products made from this material can prevent rust even if the coating falls off. They are suitable for areas with salt water or places that can be washed with water pipes. They may be a little difficult to tighten, but they are durable.
Stainless Steel (316)	Material 316 can resist the erosion of salt fog and corrosive substances on ordinary steel. Its price is relatively high, so it is only used in extremely harsh environments. However, this type of flange still provides the same tightening effect, but with much better protection performance.
Brass	This situation is not common. The French hexagonal locking nuts do not produce sparks, which is very important in some factories. They also look more aesthetically pleasing for exposed furniture or decorative hardware. They are less stiff than steel, so the serrated part is only used for light vibration rather than with high torque.

FAQ

Is the Serrated Flange Hex Lock Nuts easy to install with standard tools, and will it damage the mating surface?

Answer: The product is designed for quick installation with standard manual or pneumatic tools, no special equipment required, saving assembly time and labor costs. The flange surface structure is optimized to provide stable locking force without scratching or damaging the mating mounting surface during installation and use. It fits standard torque requirements, operates smoothly without jamming, and maintains consistent fastening performance after repeated installation and disassembly as needed.