Best Brass Lock Nuts of 2025

Corey Phillips Avatar
Corey Phillips
Last Updated: 1 Feb 2025

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Brass lock nuts are a type of fastener that provide a secure and stable connection between two threaded components. These nuts are made from high-quality brass materials that offer excellent durability, corrosion resistance, and high-temperature tolerance. Brass lock nuts are commonly used in a variety of applications, including plumbing, automotive, and electrical industries. They are available in various sizes and thread pitches to fit different types of bolts and screws. Whether you are looking to stabilise a connection or simply want to ensure the safety of your equipment, brass lock nuts are an excellent choice for your fastening needs.

At a Glance: Our Top Picks

sourcing map G3/4 Brass Lock Nut - 2pcs Cover #TOP 1
sourcing map G3/4 Brass Lock Nut - 2pcs
ftb score rating icon 9.8
sourcing map G3/4 Brass Lock Nut for Plumbing Cover #TOP 2
sourcing map G3/4 Brass Lock Nut for Plumbing
ftb score rating icon 9.7
sourcing map G1/2 Hex Brass Lock Nut Cover #TOP 3
sourcing map G1/2 Hex Brass Lock Nut
ftb score rating icon 9.5

Top 10 Brass Lock Nuts

#TOP 1

sourcing map G3/4 Brass Lock Nut - 2pcs

a21092800ux1310
Brass tone
G3/4
sourcing map G3/4 Brass Lock Nut - 2pcs Cover
sourcing map G3/4 Lock Nut, Hex Brass Female Locknut for Plumbing 2pcs

The sourcing map Brass Lock Nut is designed with female G threads, making it ideal for connecting to female threaded pipes. This feature ensures a tighter seal compared to straight threads, providing you with peace of mind against leaks. With a thread diameter of G3/4 and a thread size of 14 threads per inch, it offers compatibility for various applications. Made primarily of brass, it boasts high strength and excellent resistance to corrosion and high temperatures, ensuring durability in your plumbing needs.

What We Like
Tighter seal than straight threads
High strength and durability
Corrosion and temperature resistant
Versatile for multiple applications
#TOP 2

sourcing map G3/4 Brass Lock Nut for Plumbing

a24061600ux0267
Gold
G3/4
sourcing map G3/4 Brass Lock Nut for Plumbing Cover
sourcing map G3/4 Pipe Fitting Hex Flange Lock Nut Locknut Female Threaded Fastening Thin Nut for Plumbing, Brass 1Pcs

The sourcing map Brass Lock Nut is an essential plumbing accessory designed for efficiency. With a G3/4" threaded size and a hex width of 1.15", this durable brass construction ensures long-lasting use and resistance to corrosion. Its dual-purpose functionality allows you to utilise it as both a lock nut and a spacer, simplifying your installation tasks. The efficient hex design enables quick tightening and loosening, providing you with a secure connection that enhances the overall performance of your plumbing system.

What We Like
Durable brass material
Versatile dual-purpose use
Efficient hex design
Ready to use packaging
#TOP 3

sourcing map G1/2 Hex Brass Lock Nut

a21092800ux1313
Brass tone
sourcing map G1/2 Hex Brass Lock Nut Cover
sourcing map G1/2 Lock Nut, Hex Brass Female Locknut for Plumbing 10pcs

The sourcing map Lock Nut features female G threads that create a tighter seal with female threaded pipes, enhancing leak prevention. With a thread diameter of G1/2 and a size of 14 threads per inch, it fits various plumbing scenarios seamlessly. Made primarily of brass, this locknut offers high strength and excellent corrosion resistance, ensuring durability in demanding environments. Its versatility makes it ideal for sealing joints and pipes in applications such as outdoor gardens, washing machines, and water heaters.

What We Like
Durable brass construction
Corrosion resistant
Creates tighter seals
Versatile applications
#TOP 4

Sourcingmap 12 Pcs Brass Hex Nut Locknut

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Brass Tone
1/8BSP
Sourcingmap 12 Pcs Brass Hex Nut Locknut Cover
Sourcingmap 12 Pcs 1/8BSP Female Thread Brass Hex Nut Pipe Fitting Locknut

The Sourcingmap Brass Hex Nut is a reliable choice for anyone in need of durable pipe fittings. With an overall size of 13 x 2.5mm, these locknuts are easy to install, providing you with a hassle-free experience. Made from corrosion-resistant brass, they ensure long-lasting performance even in challenging environments. The hex locknut design effectively locks two threaded fittings into place, offering enhanced stability and reducing vibrations. This feature is particularly useful in maintaining the integrity of your plumbing installations.

What We Like
Corrosion resistant brass material
Easy installation
Stable and reduces vibrations
Compatible with 1/8BSP female threads
#TOP 5

sourcing map G1/4 Brass Lock Nut 4Pcs

a24061600ux0272
Yellow
sourcing map G1/4 Brass Lock Nut 4Pcs Cover
sourcing map G1/4 Pipe Fitting Hex Lock Nut Locknut Female Threaded Fastening Thin Nut for Plumbing Fixed, Brass 4Pcs

The sourcing map Lock Nut features a G1/4" size with a hex width of 0.67" and a height of 0.14", making it ideal for various plumbing applications. Constructed from high-quality brass, it ensures durability and resistance to corrosion, giving you peace of mind regarding quality. Its dual-purpose design allows it to function as both a lock nut and a spacer, simplifying your installations. The efficient hex shape enables quick tightening and loosening with standard tools, making it easier for you to achieve a secure and long-lasting connection.

What We Like
Durable brass construction
Dual-purpose functionality
Quick installation
Convenient individual packaging
#TOP 6

BRASS LOCK NUT BSP 1/8" by GASERVE

BRASS LOCK NUT BSP 1/8" by GASERVE Cover
BRASS LOCK NUT LOCKNUT BSP 1/8"

The GASERVE LOCK NUT is a high-quality brass lock nut designed for BSP 1/8" fittings. This durable product ensures a secure and reliable connection, preventing leaks and ensuring the safety of your plumbing systems. With its robust construction, you can trust that it will withstand high pressure and various conditions. Additionally, its ease of installation allows you to quickly set it up, saving you time and effort during your projects.

What We Like
High-quality brass material
Secure and reliable connection
Durable and pressure-resistant
Easy to install
#TOP 7

sourcing map G1 Brass Lock Nut with Flange

a21091500ux0362
sourcing map G1 Brass Lock Nut with Flange Cover
sourcing map G1 Lock Nut with Flange, Hex Brass Female Locknut for Plumbing 2pcs

The sourcing map G1 Lock Nut is designed with female G threads, making it easy for you to connect and fasten to male threaded pipes. With a thread diameter of approximately 32mm and a width across flat size of 35.7mm, this lock nut ensures a secure fit for your plumbing needs. Made from durable brass, it offers high strength and resistance to corrosion and high temperatures, providing a reliable solution for various applications, from outdoor gardens to washing machines.

What We Like
Easy installation and replacement
Durable brass construction
Corrosion and heat resistant
Wide application range
#TOP 8

sourcing map G1/4 Hex Brass Lock Nut

a21092800ux1316
Brass Tone
sourcing map G1/4 Hex Brass Lock Nut Cover
sourcing map G1/4 Lock Nut, Hex Brass Female Locknut for Plumbing 12pcs

The sourcing map Lock Nut features female G threads, ensuring a tighter seal when connecting to female threaded pipes. With a thread diameter of G1/4 and 19 threads per inch, it provides strong and reliable connections. Made primarily of brass, this locknut boasts high strength and is resistant to corrosion and high temperatures, making it ideal for various applications. Whether you're working in your garden or with appliances like washing machines and water heaters, this locknut offers the durability and reliability you need.

What We Like
High strength material
Corrosion resistant
Temperature resistant
Tighter seal connections
Versatile applications
#TOP 9

AK Brass Locking Nut BSP for Plumbing

AK
Brass
3/8"
AK Brass Locking Nut BSP for Plumbing Cover
AK BRASS LOCKING NUT BSP IN VARIOUS SIZES (3/8")

The AK Brass Locking Nut is designed specifically for plumbers to secure male threaded plumbing fittings effectively. This locking nut provides peace of mind by ensuring a tight fit on outer threaded fittings, which is crucial for preventing leaks. It is available in various BSP sizes, making it adaptable to your specific needs. However, it is important to measure carefully, as the sizes may differ from standard tape measurements. This product is ideal for applications where a permanent closure is necessary, ensuring reliable performance from your plumbing outlets.

What We Like
Secure locking mechanism
Available in various sizes
Prevents leaks effectively
Ideal for permanent closures
Designed for plumbing professionals
#TOP 10

Brass Lock Nut M15 by GASERVE LONDON

Brass Lock Nut M15 by GASERVE LONDON Cover
BRASS LOCK NUT LOCKNUT M15

The GASERVE M15 Lock Nut is a reliable choice for securing your mechanical components. Made from brass, it offers excellent durability and resistance against corrosion. This lock nut features a metric size of M15, making it suitable for various applications. By using this lock nut, you can ensure a tight fit, which prevents loosening during operation. This added security is essential for maintaining the integrity of your projects, giving you peace of mind as you work.

What We Like
Durable brass material
Metric M15 size
Prevents loosening
Easy to use
Buying Guide Image

Frequently Asked Questions (FAQs)

1. Can you reuse metal lock nuts?

They are able to be reused, but only if the prevailing torque meets certain specifications. Lock Nuts with a Nylon Insert are perhaps the most reliable lock nut, as it is only limited by the temperature of the application it has been used in.

2. What is UNC lock nut?

Lock Nuts - UNC Locknuts are used to lock a full nut in position to prevent it from working loose as a result of vibration or other factors. Locknuts are often mixed up with Nyloc nuts, which are different.

Editor's Notes

During our brass lock nut research, we found 56 brass lock nut products and shortlisted 10 quality products. We collected and analyzed 1,710 customer reviews through our big data system to write the brass lock nuts list. We found that most customers choose brass lock nuts with an average price of £5.16.

The brass lock nuts are available for purchase. We have researched hundreds of brands and picked the top brands of brass lock nuts, including sourcing map, Uxcell, GASERVE LONDON LTD, AK. The seller of top 1 product has received honest feedback from 20,002 consumers with an average rating of 4.8.

Written by
Corey Phillips Avatar

Corey Philips is an electrician and lighting expert. He graduated from the University of Birmingham in 2012 with a Bachelor's degree in electrical and electronics engineering. Corey is a specialist contractor in lights. He sells and installs and recommends lights and lamp sheds, and other lights accessories. Aside from that, Corey is vast in installing and maintaining electrical appliances like air conditioners, water heaters, and the likes.