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Flange Serrated Hex Nut

As a professional manufacturer, Xiaoguo® Flange Serrated Hex Nut comes with a serrated flange that helps prevent loosening, especially in machines with regular vibration.No extra washers are needed, so installation is simpler and faster on production lines.The threads are consistent and fit standard bolts smoothly without jamming.It works well for long-term use in machinery and construction under normal loads.We supply this nut in full size ranges, with stable batch quality, suitable for your daily projects and regular procurement.

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Product Description

Product Dimensions and Specifications:

（1）Focus on small to medium sizes

You will find these starting at really small sizes like #4-40, but the most common ones people grab are from 1/4-inch up to 3/8-inch. The thread count matters here; a coarse thread like 1/4"-20 is standard for general use. When you pick up a Flange Serrated Hex Nut in this range, the head is usually the same size as a standard nut, so your 7/16" wrench fits it fine. The flange itself is a bit wider than the nut body, usually by an eighth of an inch or so. This gives it that built-in washer look.

（2）Focus on larger sizes and fit

Once you get above 1/2-inch, the dimensions change a bit. A 5/8" Flange Serrated Hex Nut is going to need a 15/16" wrench, which is slightly bigger than a standard nut of the same thread. That is because the flange adds some material to the corners. The thickness from top to bottom also increases, usually matching the diameter of the bolt. So a 1/2" nut is about a 1/2" thick. It is a simple way to check if you have the right one in your hand.

（3）Focus on metric sizes

If you are working on anything from Asia or Europe, you are looking at metric dimensions. An M8 Flange Serrated Hex Nut takes a 13mm socket, and the flange diameter sits around 16mm. The pitch is usually 1.25 for an M8, but always check because fine threads are out there. For an M10, you move up to a 17mm wrench. They follow the same pattern: the flange is just wide enough to hold without a separate washer, but not so wide it won't fit in tight spots.

Q&A Session

How does this Flange Serrated Hex Nut deliver reliable anti-loosening performance in high-vibration working conditions?

A: This component features a serrated flange base that creates enhanced friction and interlocking force with the mounting surface, effectively resisting loosening caused by continuous vibration, mechanical operation or external impact. We run strict vibration resistance tests on random samples from each batch to verify long-term locking stability, ensuring it fits heavy-duty machinery, automotive assemblies and industrial equipment perfectly. Every qualified product meets standard anti-loosening specs with no performance compromises.

Flange Serrated Hex Nut

Mon	#8	#10	#12	1/4	5/16	3/8	7/16	1/2	9/16	5/8	3/4
P	32\|36	24\|32	24\|28\|32	20\|28\|32	18\|24\|32	16\|2432	14\|20\|28	13\|20\|28	12\|18\|24	11\|18\|24	10\|16\|20
s max	0.344	0.375	0.438	0.438	0.5	0.562	0.688	0.75	0.875	0.938	1.125
s min	0.334	0.365	0.428	0.428	0.489	0.551	0.675	0.736	0.861	0.922	1.088
e max	0.397	0.433	0.505	0.505	0.577	0.65	0.794	0.866	1.01	1.083	1.299
e min	0.381	0.416	0.488	0.488	0.557	0.628	0.768	0.84	0.982	1.051	1.24
dc max	0.469	0.5	0.954	0.954	0.68	0.75	0.937	1.031	1.188	1.281	1.5
dec min	0.452	0.48	0.574	0.574	0.66	0.728	0.91	1	1.155	1.248	1.46
k max	0.203	0.219	0.236	0.236	0.283	0.347	0.395	0.458	0.506	0.569	0.675
k min	0.187	0.203	0.222	0.222	0.268	0.33	0.375	0.437	0.483	0.515	0.627

Competitive Advantages Over Peer Products

Feature	Standard Hex Nut + Washers	Flange Serrated Hex Nut
Parts to Handle	You need three separate pieces: the nut, a flat washer, and a lock washer. That means more time hunting for parts and more SKUs to manage in your bin.	It combines all three into one piece. You just grab one item from the bin. It simplifies your inventory and speeds up installation. Less hassle when you are in the middle of a job.
Installation Steps	You have to put the flat washer on, then the lock washer, then spin the nut. Holding them all in place while you start the threads can be a pain, especially in tight spots.	You spin it on just like a regular nut. The flange and serrations are already there. One step, done. It is straightforward and saves time on repetitive work.
How It Grips	The lock washer provides tension, but it can deform or loosen over time with heavy vibration. The load is spread by the flat washer, but it is a separate piece that can shift.	The serrations bite directly into the surface. This creates a friction lock that handles vibration well. The flange is fixed, so the clamping load is always spread evenly. It just stays put.
Surface Contact	The flat washer spins independently. If it shifts during tightening, you might not get full contact. The lock washer can also gouge the surface unevenly.	The flange is a solid part of the nut. You get full, consistent contact across the whole surface. It protects the material underneath and provides a stable clamping area every time.
Cost & Stock	You are buying and stocking three different parts. Even if they are cheap individually, the total cost per fastened joint adds up. More bins, more money tied up in inventory.	You buy and stock one part. Even if it costs slightly more than a single nut, you save on the washers. It usually works out cheaper per joint, and you free up bin space.