Best Black Oxide Hex Nuts in 2026

Daisy
Last Updated: Feb 8, 2026

At a Glance: Our Top Picks for Black Oxide Hex Nuts

HELIFOUNER 360 Pieces 7 Sizes 304 Stainless Steel Hex Nuts Assortment Kit (M2 M2.5 M3 M4 M5 M6 M8)
#TOP1
Helifouner 360 Pieces 7 Sizes 304 Stainless Steel
9.7
PM SCORE
HVAZI #2-56 to 3/8"-16 UNC 304 Stainless Steel Hex Nuts Assortment Kit
#TOP2
Hvazi #2-56 To 3/8"-16 Unc 304 Stainless Steel
9.6
PM SCORE
ECKJ 210PCS 304 Stainless Steel Hex Nuts Assortment Kit for Screw Bolt with 6 Sizes DIN 934 (M3 M4 M5 M6 M8 M10) Great Replacement Fasteners for Professionals, Repairmen or DIY, Meet Your Every Needs
#TOP3
Eckj 210Pcs 304 Stainless Steel Hex Nuts Assortment
9.5
PM SCORE

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Summary of the Best Black Oxide Hex Nuts of 2026

Helifouner 360 Pieces 7 Sizes 304 Stainless Steel Hex Nuts Assortment Kit (M2 M2.5 M3 M4 M5 M6 M8)

HELIFOUNER
HELIFOUNER----HEX-NUTS----360
5.00 X 2.90 X 0.70 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
HELIFOUNER 9.89

Features

【Sizes】M2 M2.5 M3 M4 M5 M6 M8, total 360 pieces/7 sizes of the most commonly used stainless steel hex nuts in a plastic case, different sizes can satisfy your different needs.

【Material】304 Stainless Steel, stainless steel material which have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can ensure long time using.

【Weak Magnetic】The magnetic properties of 304 stainless steel due to the structure transformation reasons are not at the same level as the magnetic properties of stainless steel of other materials, which means that the magnetic properties of 304 steel always show weak magnetic properties.

【Package Included】Total 360 pieces 7 sizes hex nuts are packed in a durable transparent box with label. It is easy to distinguish the size of the product, you can choose the suitable one to meet your needs.

【Wide Applications】Widely used in all kinds of precision machinery, classified instruments, instruments, electronic products, household appliances, communication products, locks, lamps, lights, toys, etc. Ideal for use by a variety of workers and repairmen from plumbers to assemblymen both professional and amateur.

Hvazi #2-56 To 3/8"-16 Unc 304 Stainless Steel Hex Nuts Assortment Kit

HVAZI
1.20 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Jack&home 9.89

Features

High Quality 9 Kinds Stainless Steel SAE Hex nuts Assortment Kit total 280 pieces

They are coarse threads,Use these hex nuts for general purpose fastening applications

The assortments contain the following sizes:#2-56 UNC---50PCS#4-40 UNC---40PCS, #6-32 UNC---40PCS, #8-32 UNC---40PCS, #10-24 UNC----30PCS, #12-24 UNC---25PCS,1/4"-20 UNC---20PCS,5/16"-18 UNC---20PCS,3/8"-16 UNC---15PCS

All products are made of 304 Stainless Steel;are chemical resistant and may be mildly magnetic

Set includes most common SAE standard sizes so you can easily replace a lost nut;Packed in a plastic box,Easy to install and durable to use

Eckj 210Pcs 304 Stainless Steel Hex Nuts Assortment Kit For Screw Bolt With 6 Sizes Din 934 (M3 M4 M5 M6 M8 M10) Great Replacement Fasteners For Professionals, Repairmen Or Diy, Meet Your Every Needs

ECKJ
ECKJ028-210
4.33 X 2.83 X 0.77 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
ECKJ 8.04

Features

WHAT YOU GET --- You will get 6 different sizes (M3,M4,M5,M6,M8,M10) of hex nuts assorted, 210 packs with portable plastic storage box which size is 4.33*2.83*0.77 inches. Internal thread hexagonal nut fasteners conform to the DIN934 specifications.

MATERIAL--- Made of high-quality 304 stainless steel, it is characterized by high strength and good corrosion resistance in harsh environments such as high temperature, cold weather and high humidity. They have excellent rust resistance and oxidation resistance, which can guarantee long-term use.

WIDE APPLICATION --- Widely used in various precision machinery, classified instruments, electronic products, household appliances, communication products, water faucet, locks, lamps, lamps, toys, etc.. Suitable for professionals, amateurs, landlords, maintenance workers and other DIY projects. This kit is ideal for replacing damaged and lost nuts. When you are crazy about the lost nuts, it is perfect for you. There are many different sizes of the kit to meet your maximum needs.

COMPLETE SIZE --- Sizes include M3 M4 M5 M6 M8 M10 for your multi-purpose use. The thread pitch of these lock nuts respectively are M3-0.5mm,M4-0.7mm,M5-0.8mm,M6-1mm, M8-1.25mm,M10-1.5mm. Amostly covering all of your demands. Hex nuts are six sided making them easy to tighten with a wrench or socket. They are used in conjunction with a bolt, threaded rod or other threaded fastener. Use these hex nuts for general purpose fastening applications so you can easily replace a lost nut.

NOTE --- We've upgraded our packaging recently. Random delivery of new and old packaging. Please keep these away from kids under 7 years old. We guarantee you will have an amazing experience! If you had a problem, please let us know.

#TOP4

Flange Nuts Hex Lock Self-Locking Metric Thread Nut 304 Stainless Steel Assortment Kit 125Pcs,M3 M4 M5 M6 M8 M10 M12

DANA FRED
XHHDN003
7.48 X 4.13 X 1.10 Inches
0.63 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
ALBERT GUY 9.79

Features

☛【304 Stainless Flange Nuts Assortment Kit】: The nuts are made of high-quality 304 stainless steel, corrosion and rust resistant, suitable for humid environment.

☛ 【Hardware Nuts Package】:The Package Contains 7 Sizes, Included: M3 M4 M5 M6 M8 M10 M12

☛【Widely Application】: There is a wide flange at one end of the flange nut, which increases the bearing surface of the nut and is not easy to loosen. It can be used to replace the hex nut and shock-proof washer. It is widely used in automobiles, motorcycles, generators, home appliances and other projects.

☛【PLASTIC HEAT SEAL PACKAGING】: Practical and convenient of packing box, All of nuts are packed in a durable and sturdy box, this box can be use for a storage box.

☛【RELIABLE QUALITY AND SERVICE】: DANA FRED provides service for our product quality problem,such as broken problem. If unfortunately the box is broken on shipping way, please contact us, we will provide a satisfying solution.

100Pcs 304 Stainless Steel Serrated Metric Acorn Cap Nuts Hex Dome Cap Assortment Kit, 7 Sizes - M3 M4 M5 M6 M8 M10 M12

SWPEET
ACOTNUT-78
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Swpeet 9.86

Features

√ Product Name: Metric 304 Stainless Steel Acorn Cap Nuts Assorment Kit. The item come with a sturdy plastic organizer box for convenient to store and carry.

√ Size: M3 M4 M5 M6 M8 M10 M12

√ Material: 304 Stainless Steel, corrosion resistant galvanized finish to ensure life-time use, these quality assortment washers for home, automotive, and shop use.

√ Quantity: It contains 100Pcs / 7 Sizes of the most commonly used 304 Stainless Steel Acorn Cap Nuts. Different types of Acorn Cap Nuts , designed to stand off the mater ial to allow easy weld penetration, widely used to industrial machine.

√ Widely Application: Great replacement for industrial and construction fasteners,also can be a important accessories in your daily life.

Swpeet 310Pcs Metric 304 Stainless Steel 9 Sizes Hex Nuts Assorment Kit, Coarse Thread Hexagon Nut 9 Sizes - M2 M2.5 M3 M4 M5 M6 M8 M10 M12

SWPEET
S598
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Swpeet 9.86

Features

√ Product Name: Metric 304 Stainless Steel Hex Nuts Assorment Kit. The item come with a sturdy plastic organizer box for convenient to store and carry.

√ Size: M2 M2.5 M3 M4 M5 M6 M8 M10 M12 M14

√ Material: 304 Stainless Steel, corrosion resistant galvanized finish to ensure life-time use, these quality assortment washers for home, automotive, and shop use.

√ Quantity: It contains 310Pcs / 9 Sizes of the most commonly used 304 Stainless Steel Hex Nuts. Different types of Hex Nuts,designed to stand off the material to allow easy weld penetration,widely used to industrial machine.

√ Widely Application: Great replacement for industrial and construction fasteners,also can be a important accessories in your daily life.

Aussumy 10.5" Xl Large Waterproof Phone Pouch : 3 Pack Underwater Clear Cellphone Holder - Universal Water Proof Dry Bag Case With Neck Lanyard For Iphone Samsung Galaxy Cell For Beach Swimming Pool

AUSSUMY
YIWB14T-BBBLK
8.00 X 5.00 X 0.60 Inches
0.25 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Aussumy 6.84

Features

【Save More for 3 Pack】3 black waterproof phone pouch for cell phones can be used for protecting your valuables and smartphone from any watery situations.Best for travel or outdoor activities such as skiing, surfing, water skiing, rowing, beach, floating fishing, pool swimming, boating, kayaking, snorkeling, diving,cruises,camping,waterpark activities or other beach playing or any outdoor adventure.Large capacity can easily hold your airpods pro,watch,ID,cash, credit card,passport,wallet,key,etc

【10.5" Large Universal Design】 Big size water proof phone bag clear front & back cover up to 10" capacity fits all smartphones -Compatible with Apple iPhones 13 12 11 Pro Max Plus Mini SE Xs Xr X 8 7 6 6S SE promax & Samsung Galaxy FE S22 S21+ S21 S20+ S10+ S9+ S21 S20 S10 S10E Note 10 9 8 Edge Mate A71 A51 A21 A20 G7 & Android Google Pixel 6 5 5A 4A 5G 4Xl XL LG K92 Q52 K62 K71 Stylo Velvet V60 ThinQ Q51 K51 & ZTE HTC Oneplus Xiaomi Asus Fire Sony Moto Alcatel Lenovo Nokia Acer Microsoft etc.

【IPX8 Certified Waterproof】Professional certification waterproof phone holder, After around 1000 Tests, no leakage or water damage during 30M (100 Ft) deep underwater. Dual plastic swivel locks get your cellphone tightly sealed against water resistant & sand & snow & dust & dirt & sunscreen & shock & dirty Swipe for your device while maintaining full touch screen functionality. Protect our mobile phone safely under extreme conditions.

【Super Sensitive Touch】 Made with a transparent PVC material that offers a crystal clear display gives you excellent touch screen performance. Allowing you to text messages, call, watch videos, face recognition, and take selfies without taking out your phone from the pouch. When in water, recommended using the mobile hot key or Volume Buttons to operate. ABS materials snap and lock ensure durable use with scratch resistance and wear resistance.【Tips:NOT SUPPORT Touch ID】

【Warm Reminder】Together with the detachable lanyard, it will never fall off as you move around which is feel comfortable hanging around the neck. The head rotation is designed to prevent hanging belt winding. Before first use, It is necessary to do water testing by putting a dry pape inside the bag Submerging underwater for 30 minutes.There is 0.01% risk that the bag is not perfect waterproof. If it occurs,please contact us to get refund or ask us to send a new one.

#TOP8

Foliv 315Pcs Stainless Metric Hex Nuts Assortment Kit - Thread Hex Nuts For Screw Bolt - M2 M2.5 M3 M4 M5 M6 M8 Sizes

FOLIV
F-HEX NUTS
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
BESBUY DIRECT 7.59

Features

HIGH QUALITY STAINLESS: The FOLIV metric nut assortment kit is made of 100% 304 stainless steel, anti rust and corrosion resistant, making it has longer lifespan and can be used in some extreme environments.

MULTIPLE SIZES: M2*65Pcs, M2.5*65Pcs, M3*50Pcs, M4*55Pcs, M5*20Pcs, M6*35Pcs, M8*25Pcs Hex Nuts, total is 315PCS. Different sizes and different qualtities can meet users' demand.

STRONG AND DURABLE: Our hex nuts are very strong and is great for both indoor and outdoor use, non-toxic & pollution-free.

WITH HANDY BOX: All the metric hex nuts are packed in a transparent storage box, with a clear size label on it. And every sizes are packed in a small plastic bag to prevent mixing up. You can easily get what you need.

GREEN PROTECTION: FOLIV is donating from this purchase to White Memorial Conservation Center Inc., which is providing year-round environmental education programs for children and adults to protect natural resources (i.e. vegetation, water, soil, and air). Hope we could do something for this beautiful green world.

#TOP9

70Pcs Nut Acorn Plastic Hex Acorn Nuts M3/M4/M5/M6/M8/M10 Nylon Nut Hex Head Dome Acorn Covernut Hex Head Dome (Black)

WAL FRONT
WAL FRONTY2U9GHGP6D-01
5.12 X 2.76 X 0.79 Inches
0.13 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
nineone 9.66

Features

PREMIUM QUALITY MATERIAL ENSURES LONG TERM SERVICE--100% brand new and high quality

PREMIUM QUALITY MATERIAL ENSURES LONG TERM SERVICE--100% brand new and high quality

WEAR RESISTANCE NYLON MATERIAL--Made of nylon material, these acorn nuts are sturdy and durable

ANTI-SLIP ACORN HEX NUTS--It is not easy to slip when turning screw with wrench, mainly used for rough and simple components

AVOIDS FALLING OFF--Acorn nuts can prevent nuts from getting loose and falling off

IDEAL TOOL FOR HIGH STRENGTH FASTEN--It can be used as high strength fasteners for machinery, furniture, vehicles, etc

#TOP10
Best Car Nuts

10L0L Golf Cart Chrome Wheel Lug Nuts 1/2"-20 For Ezgo Txt Rxv & Club Car Ds Precedent Black (16 Pack)

10L0L
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
10L0L Golf Cart Parts 9.93

Features

16 Packs of chrome lug nuts kit for EZGO Club Car Cushman Jacobsen golf carts. (NOT for Yamaha)

Replace OEM part number#: EZGO: 14723-G1 1701160 6350, Club Cart 1010984 1011390, Cushman 800573, Jacobsen 14723-G1 1701160 6350

Thread size: 1/2 inch-20, Height: 1.40 inch, Hex Size: 3/4 inch. Please confirm the size of your golf cart wheels before you purchase.

The golf cart wheel lug nuts must be installed with a 6 point spline tuner socket key tool (17mm / 0.67inch) or a 17mm / 0.67inch combination wrench (tool is not included).

This chrome wheel lug nuts kit makes a huge difference in appearance of your golf cart. Made of high strength plastic chromed for long lasting quality and the surface was smooth and shiny. It will make your golf cart wheel look more advanced and classy.

Swpeet 132Pcs Sae 304 Stainless Steel 2 Types Lock Nuts And Hex Nuts Assortment Kit, Coarse Thread Hexagon Nut For Home Automotive Shop Use (#2#4#6#8#10 1/4"-20 5/16"-18 1/2"-13 5/16"-18)

SWPEET
S2079
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Swpeet 9.86

Features

💯 What You Get -------- In this kit, You will get 132Pcs SAE 304 Stainless Steel 2 Types Lock Nuts and Hex Nuts Assortment Kit, Including 57Pcs Lock Nuts and 75Pcs Hex Nuts. Intotal 132Pcs can meet all your needs. The item come with a sturdy plastic organizer box for convenient to store and carry. PS: Individual size products do not have boxes, only sets have boxes.

💯 57Pcs 8 Sizes Lock Nuts ------ These lock nuts manufactured with industrial strength 304 Stainless Steel, Including #8-32; #10-24; 1/4-20; 5/16-18; 3/8-16; #4-40; #6-32; 1/2-13. 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.

💯 75Pcs 7 Sizes Hex Nuts -------- It contains 110Pcs of the 304 Stainless Steel Hex Nuts. 7 Different sizes of Hex Nuts, #2-56; #4-40; #6-32; #8-32; #10-24; -1/4-20; 5/16-18. Designed to stand off the material to allow easy weld penetration, widely used to industrial machine. Used in conjunction with bolts and screws to connect and fasten the parts. Match screws and bolts to help secure items.

💯 Wide Applications ---------- Perfect for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection. Great replacement for industrial and construction fasteners,also can be a important accessories in your daily life.

💯 EASY TO STOREAGE ------ The rugged plastic box serves as a suitcase, allowing users to organize locking nuts in a neat manner according to size. It can also be stored in a garage, workbench or worksite as a convenient storage space. The transparency of the box allows users to check the quantity and inventory without opening the box.

(10Set) 5/16-18X3" Complete Set Hex Head Screw Bolts,Nuts,Fender Flat Washers,Split Lock Washers,Fully Threaded, Stainless Steel 18-8(304), Bright Finish.

KATUNA
HXBT0001
5.10 X 4.30 X 0.74 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Katuna Fastener 5.27

Features

High-quality material: Our hex bolt sets are made of high-grade steel with excellent durability and corrosion resistance, ensuring long-lasting use in various applications.

Versatile use: Our hex bolt sets are suitable for various applications, including automotive, machinery, construction, and more.

Precise threading: Each hex bolt in our set is precisely threaded, ensuring a snug fit and providing a secure hold for the components they fasten.These heavy duty hex nuts and bolts with full deep thread will provide a stronger and quicker torque than ordinary screws, which will make force evenly, not easy to slip and ensure long-lasting tightening force, you can use it with confidence.

Hex bolts generally require flat & lock washers to evenly distribute the pressure from the head and the nut. The combinations we provide save your time and money to buy washers and nuts seperately.

Package includes: 10Pcs of 5/16 x 3 bolts,5/16 hex nuts , 5/16 fenderFlat washer & 5/16 splitLock washers,Screw them together and put them in a plastic bag.

Value pack: Our hex bolt sets are available in different sizes and quantities to meet your needs. Each set provides excellent value for money, ensuring that you have plenty of high-quality hex bolts for your projects.

Made from 18-8 stainless steel, screws have good chemical resistance and may be mildly magnetic.

Plastic Nut And Bolt Protection Dome Cover, Black Hex Nut Protective Caps Cover, No Thread, M6 X 10Mm, 100 Pcs

FXIONICON
FX0044-100-M6
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
OnlineFoison 5.61

Features

Perfect Fit: Our nut cover protectors have a 10mm inner diameter and fit 10mm wrenches and hex nuts. Please confirm the size you need before purchasing.

Durable Material: Made of high-quality PE plastic, our protectors are strong, lightweight, and long-lasting. They protect bolts, nuts, and wrenches from wear and tear.

Multiple Sizes Available: We offer a range of sizes, from 7mm to 20mm, to fit a variety of home accessories.

Versatile Use: Our protectors are suitable for nuts, hex pipes, wrenches, furniture, and more. They not only protect nuts and bolts but also enhance their appearance and prolong their lifespan.

Excellent customer service: If you have any questions or concerns about our products, please do not hesitate to contact us. We will reply within 24 hours.

Top 10 hex nuts Brands on Amazon

Here is the list of top-rated brands that were evaluated by PM.

Brand Count
Swpeet 3
10L0L 1
Aussumy 1
Dana Fred 1
Eckj 1
Foliv 1
Fxionicon 1
Helifouner 1
Hvazi 1
Katuna 1

Top 10 hex nuts Brands Pie Chart


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We are dedicated to assisting our users in finding the right nuts Products based on their needs, saving them considerable time when choosing which hex nuts to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.