Best Steel Locknuts in 2026

Made of high quality Stainless Steel 304 which offers a high level of chemical and corrosion resistance.

Nut Type: Metric Nylon Insert Flange Lock Nut.

Thread Diameter: M8; Thread Pitch: 1.25mm; Flange Diameter: 16.4mm.

【High Quality Stainless】These Lock Nuts are 100% 18-8 (304) Stainless Steel which is one of the highest forms of corrosion resistant metals, making it last longer than other Nuts on the market today.

【Locknuts That You Can Depend On】Our hex lock nuts are very strong and are great for both indoor and outdoor use. This stainless is superior to regular steel and provides excellent rust resistance. With a nylon insert, these lock nuts greatly reduce loosening under vibrations and torque.

【Great To Keep Around】Bolt Dropper hex nuts are great to have around for use in wood and wet environments. Bolt Dropper Hex Nuts are the highest quality available on the market and we stand by our claim 100%. They are strong, corrosion resistant and will support all of your projects.

- Material: 304 Stainless Steel ; - Weight: 50g;

- Hole diameter: 3mm/ 0.12"; - Pitch: 0.5mm;

- Package: 100 x M3 Nylon nuts; - Color: Silver;

- Thread size: M4mm/ 0.16"; - Pitch: 0.7mm;

- Package: 50pcs x M4 Nylon Lock nuts; - Color: Black;

- Material: Q215 Carbon Steel ; - Weight: 40g;

Durable Product

This Product Meets The Customer Requirement

Manufactured In China

Type：Nylon Insert Lock Nut

Diameter-Thread Size：1/4"-20

Grade: 18-8

For use with an externally threaded item that measure 3/8 inch and has 16 threads per inch.

Width Measured From Flat to Flat 9/16"

Height 29/64"

Diameter: 5/16"

Material: Stainless Steel

Driver Type: 1/2 Wrench

🍀· 12 Most Popular SAE and Metric Sizes: this 320pcs hex nuts kit includes 1/4-20 (45 pcs), 8-32 (30 pcs), 10-24(30 pcs), 5/16-18 (20 pcs), 3/8-16 (5 pcs), M3(65 pcs), M4(37 pcs), M5(30 pcs), M6(25 pcs), M8(17 pcs), M10(10 pcs), M12(6 pcs) which allocates commonly applied lock nuts. Great fasteners for professional users and DIY projects

🍀· Sturdy and Durable: These Lock Nuts are quality 304 stainless steel, with good processing,rust resistant performance, high toughness, widely used in industry and furniture decoration industry and food medical industry.

🍀· Lock Effectively Even Multiple Time Uses: With nylon insert collar that is non-corrosive, these hex nuts greatly reduce loosening under vibrations and torque, providing better security and firm hold and a large number of use shows that the lock nut after repeated tightening and disassembly, the locking force does not decrease and can maintain the original effect.

Package: 50 PCS 10#24 Nylon Insert Hex Stainless Locknuts (Specification described in the pictures)

Thread Size:10#24; Thread Pitch: 24 TPI Coarse Thread UNC; Thread Coverage: Full

Hex Drive Size: 3/8"; Width From Flat to Flat:0.362 inch to 0.376 inch; Overall Height: 0.157 inch to 0.187 inch;

Package: 25 PCS 1/4"-20 Nylon Insert Hex Stainless Locknuts

Thread Size: 1/4"-20; Thread Pitch: 20 TPI UNC Coarse Thread; Thread Coverage: Full Thread

Hex Drive Size: 7/16"; Width From Flat to Flat: 7/16 inch; Overall Height: 21/64"

Thread Size：#10-24.

Hex Drive Size: 3/8''.

These lock nuts greatly reduce loosening under vibrations and torque with a nylon insert.

APPLICATION: A nyloc nut, also referred to as a nylon-insert lock nut, polymer-insert lock nut, retaining nuts, prevailing torque nut, or elastic stop nut, is a kind of locknut with a nylon collar that increases friction on the screw thread.

SECURE FIT: Assortment of 150 standard fastening nylon lock nuts in 6 common SAE sizes for convenient all-purpose bolts used most ideal for professionals and DIYers to prevent loosening due to vibration and rotation.

DURABLE: Self-locking nut with nylon collar replaces lock washers preventing unintentional moving bolts from coming out for a more secure and durable hold in furniture craftsmanship, construction, or automotive uses.

☛ MULTIFUNCTIONAL ASSEMNLY KIT ------ Advanced 304 stainless steel nylon locking nut, 7 common sizes, general, convenient, easy to use, very suitable for professionals and DIY users. This suite is one of the few products on the market. It has high quality and better quantity. It is an economical and efficient choice.

☛ NYLON COLLAR ------ These lock nut manufactured with industrial strength, which can replace locking washers, prevent bolts from being exposed and provide better safety and firm fixation. Compared with locking washer, it has better performance because it is made of non-corrosive material.

☛ HIGH QUALITY ------ Have strong anti-rotation ability, which can prevent the locking nut from weakening and loosening under vibration and torque, thus reducing the clamping strength. Guaranteed intact, unswerving, almost indestructible.

Good quality materials:Metric thread,made of high quality zinc alloy, hardness of high resistance to rust, wear and corrosion-resistant environmental protection and aesthetic characteristics

Package include: 7 sizes include M4*10, M5*10, M6*10, M6*15, M8*15 M8*20, M10*25, total 130 pieces in a transparent box with can meet your different needs

Usage and install: pre-drill a proper hole, screw in with internal hex tool; Unique self-tapping designed external thread, contribute to tapping, with good tensile resistance, install with hex key, tapered external threads makes it not easy to pull out caused by vibration

1. Product Type: High quality nylon insert lock nuts

2. Material: Made of superior 304 stainless steel, strong and durable

3. Package: This kit include 7 sizes of M3 M4 M5 M6 M8 M10 M12 total 175pcs in a clear box

Needle Stainless steel Diameter 0.5mm-0.019Inch-19mil

Needle Stainless steel Long 25mm-1Inch

Sterile Blister Packaging

🔩【Wide Use】Perfect for home DIY, Industrial Use

🔩【Good Quality 】Made of Nylon polyamide 6/6 and Steel in good quality

🔩【Heavy Duty 】 Designed to offer superior durability and exceptional strength

🍀【Dimensions】M8

🍀【PACKAGE CONTENT】25pcs x Nylon Insert Lock Nuts.

🍀【HIGH QUALITY STAINLESS】Nylon Insert Hex Lock Nuts made of 304（18-8）stainless steel, firm and corrosion resistant, with nylon inserts inside, the locknut greatly reduces loosening under vibration and torque.

Superior Resistance to Rust & Corrosion When Compared to Common Stainless Kits

Professional & Dependable Top Quality Type 316 Stainless Steel Lock Nut Assortment Kit

Includes Only Top Grade, Type 316 Stainless Steel Lock Nuts

Ideal for applications in which quick, easy assembly or disassembly is desired

Easy to install

Made of high-strength steel

High Quality 7 Kinds Stainless Steel Hex nuts with lock washer/ Keps Nuts/ K-lock NutsAssortment Kit total 170 pieces

The assortments contain the following sizes:#4-40 UNC --40PCS, #6-32 UNC --35PCS, #8-32 UNC --30PCS, #10-32 UNF(fine thread)--20PCS, #10-24 UNC --20PCS, 1/4"-20 UNC --15PCS, 5/16"-18 UNC --10PCS

The hex nut are made of 304 Stainless Steel;are chemical resistant and may be mildly magnetic;The lock washer are made of 420 Stainless Steel,are chemical resistant with have magnetic

🔧【DIMENSION】#10-32

🔧【MATERIAL】Keps Nut made of 304（18-8） stainless steel, good thermal conductivity and heat resistance, firm and corrosion resistant, can ensure long time using.

🔧【EASY TO USE】K-Lock Nuts feature a built in external tooth lock washer that is free spinning, The teeth on the lock washer can bite into the surface and help lock the nut into place.

- Hole diameter: 2mm/ 0.08"; - Pitch: 0.45mm;

- Material: 4.8 Grade Carbon Steel ; - Weight: 30g;

- Package: 100 x M2.5 Nylon Lock nuts; - Color: Black;

Product Type : Nylon Insert Stainless Lock Nuts Locknuts; System of Measurement : Inch.

Material : Stainless Steel 18-8 (304), high hardness and provides excellent rust resistance, making it long last use.

Diameter-Thread Size : 5/16"-18; Pitch Size : 18 TPI UNC Coarse Thread.

ENHANCED QUALITY BRASS Makes our Locknut Washer 1/2" Resistant to Corrosion and Safe for high temperatures

CONVENIENTLY DESIGNED TO CONNECT Pipes or Fittings of Different Diameter, Material, and End Type. Our Metal Hose Vacuum Gauge Locknut Washer 1/2" has 0,5 inch Female Threads.

RELIABLE FITTING of the Bushing Reducer is Provided by the Well-Machined Threads and the Relative Softness of the Brass that Enables Tighter Sealing. Easy to Install or Change. Doesn’t Leak!

Thread Size: 12mm; Thread Pitch: 1.5mm; Thread Type: Fine Thread; Thread Coverage: Full Thread

Hex Drive Size: 19mm; Package: 10 pieces

Material: 304 stainless steel (A2-70) and no exterior finish, greater strength and corrision resistance performance than regular stianless steel or zinc plated fasteners.

High Quality 8 sizes sae 304 Stainless Steel 4-40 6-32 8-32 10-24 10-32 1/4"-20 5/16"-18 3/8"-16 Nylon-Insert Locknuts Kit;sae elastic stop nuts;self-locking nut;blocking nut

The assortments contain the following sizes and quantity:#4-40 UNC(40PCS);#6-32 UNC(30PCS);#8-32 UNC(25PCS);#10-24 UNC(25PCS);#10-32 UNF(25PCS) ;1/4"-20 UNC(20PCS);5/16"-18 UNC(15PCS);3/8"-16 UNC(10PCS), Total 190 piece

A nylon insert grips threads to resist loosening,Also known as elastic stop nuts,these can be used as a stop.Use these sae hex Nylon-Insert Locknuts for general purpose fastening applications

Premium Material: These lock nuts and washers are made of excellent 304 stainless steel and nylon material, which is corrosion and rust resistant, not easy to damage and crack, sturdy and durable for long term use.

Lock Nuts: Stainless steel nylon locknut can prevent loosening, available in 7 sizes: m3 x 30pcs, m4 x 25pcs, m5 x 25pcs, m6 x 25pcs, m8 x 12pcs, m10 x 9pcs. , m12 x 6 pieces.

Flat Washers: Flat washers are mainly used for decompression and friction reduction, leakage prevention, isolation, etc. There are 9 types: M2 x 168pcs, M2.5 x 168pcs, M3 x 150pcs, M4 x 140pcs, M5 x 82pcs, M6 x 60pcs, M8 x 50pcs, M10 x 20 pcs M12 x 10 pcs

➤[Package Includes]: You'll receive 15pcs M5 nylon insert flange lock nuts in total, which are important accessory in your daily, very practical for various use.

➤[High Quality Material]: Flange lock nuts are made of high quality 304 stainless steel, have good performance of rust, corrosion and chemical resistance. High hardness and good quality make it work well in indoor and outdoor environment, you can feel relieved to use our products.

➤[Nylon Insert Design]: Our flange lock nuts with nylon insert are able to prevent getting loose under vibrations and torque and protect nut threads from deformation. Flange design allows nut to insert larger holes than ordinary lock nuts.