M4 vs. Other Thread Sizes: Choosing the Right Keymod Nuts for Your Build

April 02, 2025
M4 vs. Other Thread Sizes: Choosing the Right Keymod Nuts for Your Build
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It’s never ideal for firearm accessories to come loose or fall off. One way to prevent this is by using high-quality screws that fit precisely into your firearm’s threaded holes. Screw thread size refers to the dimensions of a screw’s threads, and understanding how to determine the right size ensures a stable and secure attachment.

If you’re looking to mount Keymod accessories, Keymod nuts are specifically designed for this purpose, making them the best choice for upgrading your firearm. Let’s explore the different thread sizes to find the one that best suits your needs.

 

Photo by Specna Arms

 

Understand the M4 Threaded Nuts for KeyMod Rail Mounts

At Wilbur’s Finest, we offer M4 Threaded Nuts specifically designed for Keymod Rail Mounts. The M4 designation refers to the outer diameter of the threaded section (4mm), with a standard pitch of 0.7mm between each thread. This ensures a secure and precise fit for Keymod-compatible accessories.

Other commonly used thread sizes in Keymod systems include M5 and #10-24, but choosing the right size is crucial. A wrong fit can lead to loose attachments, reduced stability, or even compatibility issues with certain accessories.

Photo by Photo By: Kaboompics.com

 

Comparing M4 to Other Thread Sizes

While M4 threading is the most commonly used in Keymod systems, M5 and #10-24 are also available in some applications. Here's how they compare:

M5 threading, on the other hand has a 5mm diameter and 0.8mm pitch, offering a larger and stronger alternative to M4, making it ideal for heavy-duty applications. This increased load-bearing capacity is the ideal size when mounting larger or heavier firearm accessories that require additional strength. 

However, M5 threading is less common in Keymod systems, which prioritize lightweight modularity over excessive weight. Additionally, M5 may not be compatible with standard M4 Keymod mounting slots, so it’s essential to check specifications before purchasing to ensure a proper fit.

 

 

Lastly, #10-24 threading follows the imperial measurement system, which is different from the metric-based M4 and M5 threads. Some U.S.-made Keymod accessories may use #10-24 instead of M4, which can lead to compatibility challenges when mixing metric and imperial hardware.

Selecting the correct thread type is very important because mismatches can cause stripping, loose attachments, or installation issues. To avoid complications, users should always double check threading specifications before integrating different thread standards into their Keymod setups.

 

 

Why Choose M4 for Your Keymod System?

M4 threading is a widely accepted standard due to its balance of strength and versatility, making it an ideal choice for securely mounting firearm accessories. At Wilbur’s Finest, our high-strength steel M4 Keymod Nuts feature a durable black oxide coating, providing reliable rust protection and long-lasting performance for any Keymod setup.

Another good thing about M4 KeyMod Rail Mount Nuts?

They're more commonly available and easier to source! At Wilbur’s Finest, we offer flexible ordering options, allowing you to choose from 100 to 1,000 pieces to accommodate both individual projects and bulk orders. Message us for exclusive high-volume pricing.

Order today and upgrade your Keymod system with Wilbur’s Finest Keymod Nuts!

 

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