Best Slotted Nuts of 2026

Brian Howie Avatar
Brian Howie
Last Updated: Jan 7, 2026

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Slotted nuts are a type of fastener that feature a slot or cut on one side, allowing for easy installation and removal without the need for specialized tools. These nuts are designed to securely hold objects in place while allowing for quick adjustments or disassembly when necessary. They are commonly used in applications where frequent assembly and disassembly are required, such as in machinery, automotive, or construction industries. Slotted nuts offer convenience and versatility, making them a popular choice for professionals and DIY enthusiasts alike.

At a Glance: Our Top Picks

Glarks Hexagon Slotted Nuts Assortment Kit Cover #TOP 1
Glarks Hexagon Slotted Nuts Assortment Kit
ftb score rating icon 9.8
Glarks 20Pcs 304 Stainless Steel Hex Slotted Nuts Kit M6-M16 Cover #TOP 2
Glarks 20Pcs 304 Stainless Steel Hex Slotted Nuts Kit M6-M16
ftb score rating icon 9.7
uxcell 3/4-16 UNF Zinc-Plated Hex Slotted Nut Cover #TOP 3
uxcell 3/4-16 UNF Zinc-Plated Hex Slotted Nut
ftb score rating icon 9.5

Top 10 Slotted Nuts

#TOP 1

Glarks Hexagon Slotted Nuts Assortment Kit

G-3265
Zinc
Glarks Hexagon Slotted Nuts Assortment Kit Cover
Glarks 60Pcs M10 M12 M14 M16 M18 M20 Hexagon Slotted Nuts Assortment Kit, 6 Size Carbon Steel Hex Castle Nuts for Car Moto Furniture Fasteners Repair

The Glarks Hex Slotted Nuts kit offers a versatile collection with 60 pieces across six different sizes, ensuring you have the right nut for various projects. Made from durable carbon steel, these nuts resist rust, wear, and deformation, giving you long-lasting performance. The unique slotted design allows you to secure the nuts with cotter pins, preventing loosening and ensuring safety. Installation is straightforward—you simply drill holes in the bolts to fit the cotter pins and tighten the nuts with less effort, saving you time and hassle during repairs or assembly.

What We Like
Variety of sizes included
Durable carbon steel material
Secure fastening with cotter pins
Easy and efficient installation
#TOP 2

Glarks 20Pcs 304 Stainless Steel Hex Slotted Nuts Kit M6-M16

G-2573
Glarks 20Pcs 304 Stainless Steel Hex Slotted Nuts Kit M6-M16 Cover
Glarks 20Pcs M6 M8 M10 M12 M14 M16 304 Stainless Steel Hexagon Slotted Nuts Assortment Kit, 6 Size Hex Castle Nuts for Car Moto Furniture Fasteners Repair

The Glarks Hex Slotted Nuts kit offers 20 pieces in six different sizes, giving you flexibility for various projects. Made from durable 304 stainless steel, these nuts resist rust, wear, and deformation, ensuring long-lasting use. The unique slotted design allows you to secure the nuts easily with cotter pins for added safety. Plus, their hexagonal shape is designed for tight spaces, letting you tighten them with smaller wrench turns, which makes installation easier and more efficient. This kit is ideal for anyone needing reliable, versatile fasteners for repairs or mechanical work.

What We Like
Variety of sizes
Durable stainless steel
Secure cotter pin slots
Easy installation in tight spaces
#TOP 3

uxcell 3/4-16 UNF Zinc-Plated Hex Slotted Nut

a24062500ux0172
Silver
3/4-16 UNF
uxcell 3/4-16 UNF Zinc-Plated Hex Slotted Nut Cover
uxcell 3/4-16 UNF Hexagon Slotted Nut, Grade 6.8 Zinc-Plated Carbon Steel Hex Nuts Good for Machinery Repairing, Silver, 2Pcs

The uxcell Hex Slotted Nut is designed with a 3/4-16 UNF thread size, making it compatible with various machinery parts that require precise threading. Its hexagonal shape with slots allows you to insert a cotter pin, ensuring the nut stays securely in place during use. Made from durable carbon steel and finished with a zinc plating, this nut resists rust, corrosion, and wear, so you can rely on it for long-lasting performance. Measuring 1.17 inches across and 0.64 inches tall, it’s built to high strength standards, giving you a sturdy and reliable fastener for repairs or mechanical projects.

What We Like
Durable carbon steel
Zinc-plated corrosion resistance
Secure cotter pin slots
Precise 3/4-16 UNF threading
High strength Grade 6.8
#TOP 4

PATIKIL 1/8IP Hex Coupling Nut 10 Pack

pta220901tt0937
off-white
1/8-27
PATIKIL 1/8IP Hex Coupling Nut 10 Pack Cover
PATIKIL 1/8IP(1/8-27) Hex Coupling Nut, 10 Pack Female Thread Connector 30mm Hexagonal Sleeve Nut Rod Bar Stud Tube Joint Slotted Hardware for Lamp Repair DIY

The PATIKIL Hex Coupling Nut is made from sturdy carbon steel, giving it strong durability and resistance to bending, so you can rely on it for long-lasting use. Its zinc coating helps prevent rust, which means the nut will keep working well even in damp conditions. Designed with a 1/8-27 thread size, this nut easily connects two threaded tubes, making your repair or DIY projects simpler without needing extra tools. The 30mm height and 14mm hex width provide a good grip, making it easier for you to fasten or extend threaded pipes, especially when fixing lamps or ceiling lights.

What We Like
Durable carbon steel
Rust-resistant zinc coating
Easy tool-free use
Precise 1/8-27 threading
Good grip size
#TOP 5

Hillman 2697 USS Slotted Hex Nut 5/8-18 Zinc Plated

2697
Grey
5/8"-18
Hillman 2697 USS Slotted Hex Nut 5/8-18 Zinc Plated Cover
Hillman 2697 5/8-18-Inch USS Slotted Hex Nut, 6-Pack

The Hillman USS Hex Nuts are designed with internal threading, making them perfect for securely fastening bolts and screws in various projects. Their hexagonal shape allows for easy gripping with standard tools, which helps you tighten or loosen them with less effort. These nuts are compatible with any machine screw thread, giving you great flexibility for different fasteners. Made from steel with a zinc plating, they offer durability and resistance to rust, ensuring your work holds up over time. Whether you’re working on repairs or building something new, the Hillman USS Hex Nuts provide reliable performance and convenience.

What We Like
Internal threading
Hex drive shape
Compatible with machine screws
Steel with zinc plating
#TOP 6

Glarks Hexagon Slotted Nuts Assortment Kit

G-3264
Black
Glarks Hexagon Slotted Nuts Assortment Kit Cover
Glarks 60Pcs M10 M12 M14 M16 M18 M20 Black Hexagon Slotted Nuts Assortment Kit, 6 Size Carbon Steel Hex Castle Nuts for Car Moto Furniture Fasteners Repair

The Glarks Hex Slotted Nuts kit offers you 60 pieces in six different sizes, so you have the right nut ready for various projects. Made from durable carbon steel, these nuts resist rust, wear, and heat, ensuring they last long and keep your work secure. Their slotted design allows you to use cotter pins, which help lock the nuts in place and prevent loosening. Installation is straightforward—you only need to drill holes for the cotter pins and tighten the nuts with less effort, thanks to their 60-degree turn design. This makes your repair or assembly work smoother and more reliable.

What We Like
Variety of sizes
Durable carbon steel
Secure locking design
Easy installation
#TOP 7

uxcell M24x1.5mm Four-Slot Round Nuts

a19030500ux1006
Black
M24x1.5mm
uxcell M24x1.5mm Four-Slot Round Nuts Cover
uxcell M24x1.5mm Fine Pitch Thread Retaining Four-Slot Slotted Round Nuts, 2 Pcs

The uxcell M24 Slotted Nuts offer a precise M24 x 1.5mm thread size, making them suitable for applications needing fine pitch threading. With a compact 39mm outer diameter and 10mm height, these nuts provide a sturdy fit without taking up much space. Made from carbon steel with a black oxidized finish, they resist rust and last longer, giving you reliable performance over time. The design includes internal threading and four slots, which makes installation and removal easier, especially when using specialized tools. These features combine to give you a durable and convenient solution for securing parts like roller bearings and pump valves.

What We Like
Fine pitch threading
Compact dimensions
Rust-resistant finish
Four-slot design
#TOP 8

SUUJI 10 PCS Metric M6 Barrel Nuts

S-M6 Barrel Nuts
zinc
M6*10*12(10pcs)
SUUJI 10 PCS Metric M6 Barrel Nuts Cover
10 PCS Metric M6x10mmx12mm Barrel Nuts,for M6-1 Bolts Cross Dowels Slotted Nuts Baby Bed Crib Screws Hardware Replacement Kit M6 Color zinc

The SUUJI Metric M6 Barrel Nuts are strong and durable hardware replacement kit for various furniture assemblies. Made of carbon steel and galvanized to prevent oxidation, these barrel nuts are designed to maximize product life. With a thread hole diameter of 5.35mm, thread pitch of 1mm, outer diameter of 10mm, and length of 12mm, they are suitable for most beds, cribs, and flat furniture. These barrel nuts work well in joining wood and boards, making them ideal for kitchen cupboards and other furniture pieces. Please carefully read the size details before placing an order to ensure a perfect fit for your needs.

What We Like
Strong and durable
Maximizes product life
Wide application range
#TOP 9

uxcell M14x1.5mm Hex Slotted Nut, Grade 4.8 Carbon Steel

a22030900ux0118
Black
M14x1.5mm
uxcell M14x1.5mm Hex Slotted Nut, Grade 4.8 Carbon Steel Cover
uxcell M14x1.5mm Hexagon Slotted Nut, Grade 4.8 Carbon Steel Hex Castle Nuts, Black, 5Pcs

The uxcell Hex Slotted Nut offers a precise M14 thread size with a 1.5mm pitch, making it easy to fit onto compatible bolts securely. Its 21mm width and 15mm height provide a sturdy grip, while the 9mm full thread height ensures strong fastening. Made from durable carbon steel with a blackened finish, this nut resists rust and wear, so you can trust it to last. The slots allow you to insert a cotter pin, which keeps the nut firmly in place during use, adding extra safety and reliability for your projects.

What We Like
Durable carbon steel material
Rust and wear resistant finish
Precise M14x1.5mm threading
Slots for cotter pin security
#TOP 10

zDwfDc 76PCS M6 Barrel Nut Kit DD027-c

DD027
Colored
zDwfDc 76PCS M6 Barrel Nut Kit DD027-c Cover
zDwfDc 76PCS Colored Metric M6 Barrel Nut M6 x 10mm/11mm/12mm/13mm/15mm/20mm Cross Dowel Slotted Nuts Kit DD027-c

The zDwfDc M6 Barrel Nut Kit offers 76 pieces of M6-sized barrel nuts in six different lengths, perfect for matching your furniture bolts. These nuts are specifically designed for 6mm holes, ensuring they fit M6 furniture bolts and not the larger M8 bolts, so you get a precise fit. Made from durable carbon steel with a galvanized finish, they resist wear and last longer, saving you from frequent replacements. When paired with connecting bolts, these barrel nuts provide a strong hold, making your furniture more stable. This kit is versatile, ideal for assembling beds, wardrobes, and other wood or kitchen pieces, giving you the convenience of a reliable fix.

What We Like
Variety of sizes
Durable carbon steel
Precise M6 fit
Strong furniture hold
Wide application use
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What are slotted nuts used for?

Slotted nuts are used in applications where there is a risk of vibration or motion that could loosen the nut. They provide a locking mechanism to prevent the nut from coming undone. Slotted nuts are similar to castle nuts and can often be used interchangeably due to their similar dimensions.

2. What is the difference between slotted and castle nuts?

The main difference between slotted and castle nuts is in the design of the turret end section where the split pin is inserted. A castle nut has a slightly turned-down end section that allows the split pin to be wound around and pinned against the turret, keeping the pin from protruding. On the other hand, a slotted nut does not have this feature.

3. What is a slotted hex nut designed to be used with?

A slotted hex nut is designed to be used with a cotter pin to create a locking mechanism. These nuts have portions cut out, similar to a castle nut, but with a lower profile. This makes them a suitable option for certain applications.

4. What keeps a slotted nut from coming off?

To prevent a slotted nut from coming off, a cotter pin is used. After the nut is tightened, the cotter pin is inserted into the nut slot and the bolt tail hole. The end of the cotter pin is then pulled open to secure it, preventing the relative rotation of the nut and the bolt.

5. What is the purpose of a double nut?

The purpose of using two nuts, known as a double nut, is to prevent self-loosening of fasteners. This method is commonly used in old machinery. The thin nut, often placed below the standard thickness nut, adds an extra layer of security to prevent loosening.

6. Why do people stake castle nuts?

Staking castle nuts is done to ensure the nut remains securely in place. Failure to stake the castle nut can lead to issues, especially in critical situations. For firearms, staking the castle nut is crucial to prevent it from coming loose during use, which could have catastrophic consequences.

Editor's Notes

During our slotted nut research, we found 24 slotted nut products and shortlisted 10 quality products. We collected and analyzed 3,970 customer reviews through our big data system to write the slotted nuts list. We found that most customers choose slotted nuts with an average price of $7.94.

The slotted nuts are available for purchase. We have researched hundreds of brands and picked the top brands of slotted nuts, including Glarks, uxcell, PATIKIL, Hillman, SUUJI. The seller of top 1 product has received honest feedback from 684 consumers with an average rating of 4.8.

Written by
Brian Howie Avatar

Brian Howie is a content writer and senior industrial designer. After graduation from Westminster College, he has been engaged in product design and manufacturing for 18 years. Brian Howie has always found great pleasure in designing industrial products and sharing his ideas and experience online.