Skip to main content
Home / Screws / 304 Stainless Steel Round Head Screw and Nut Combo Set with Bolts, Flat Washers, and Spring Washers M3 M4 M5 M6 mm

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material 304 Stainless Steel
Head Style Round Head
Included Sizes M3, M4, M5, M6
Finish Polished Silver
Thread Type Metric Coarse
Drive Type Phillips (Cross)
Washer Types Included Flat Washers and Spring Washers
Corrosion Resistance High (Suitable for Indoor/Outdoor)
Package Contents Screws, Nuts, Flat Washers, Spring Washers
Application General Machinery, Electronics, Furniture Assembly

6 reviews

A

Anonymous

Mar 25, 2026

Rating: 5/5

Must-have for the workshop

This combo set is a staple in my toolbox now. The polish is nice, and they don't strip easily when tightened. It's great to have a go-to box for various metric sizes without buying individual packs.

A

Anonymous

Mar 19, 2026

Rating: 5/5

Perfect for electronics projects

I use these primarily for mounting components in custom PC builds and robotics. The threads are precise and engage smoothly with the nuts. Having both flat and spring washers included saves me a trip to the hardware store.

A

Anonymous

Mar 11, 2026

Rating: 5/5

Excellent quality stainless steel

These screws are exactly what I needed for my outdoor project. The 304 stainless steel feels very durable and hasn't shown any signs of rust after a few weeks in the rain. The variety of sizes in one box is incredibly convenient.

A

Anonymous

Mar 04, 2026

Rating: 5/5

No rust issues so far

Bought these for a garden trellis project. After two months of exposure to humidity and watering, there is zero corrosion. The round head design also prevents snagging on clothing, which is a nice bonus.

A

Anonymous

Mar 03, 2026

Rating: 4/5

Great value kit

Good assortment of M3 to M6 bolts. The round heads look clean on my furniture assembly. I took off one star because the plastic organizer box was slightly cracked upon arrival, but the hardware itself is perfect.

A

Anonymous

Mar 03, 2026

Rating: 4/5

Solid hardware, good selection

The quality is consistent across all sizes. I used the M5 and M6 bolts for a shelf bracket repair, and they hold very securely. The only improvement would be including a small storage divider inside the box.

5 FAQ

Q: Is the packaging resealable?

A: Yes, the set comes in a sturdy plastic compartmentalized box with a snap-on lid, making it easy to open and close for organized storage of leftover hardware.

Q: Does this set include an Allen key or screwdriver?

A: No, this kit contains only the fasteners (screws, nuts, and washers). Tools are not included. You will need a standard Phillips head screwdriver appropriate for the M3-M6 sizes.

Q: Can these be used in saltwater environments?

A: While 304 Stainless Steel offers good corrosion resistance, it is not recommended for direct, prolonged submersion in saltwater. For marine environments, 316 Stainless Steel is typically preferred. These are suitable for general outdoor use.

Q: What is the thread pitch for the M4 bolts?

A: The M4 bolts in this set feature a standard coarse thread pitch of 0.7mm, which is the default for metric M4 fasteners unless specified otherwise as fine thread.

Q: Are these screws magnetic?

A: 304 Stainless Steel is generally non-magnetic or very weakly magnetic. These screws may show a slight attraction to strong magnets due to the cold-heading manufacturing process, but they are not strongly magnetic like carbon steel.

Explore your interests

View More
All Categories
Best Seller (30)
New List (30)
Zhong Shaojing Lingfei Jing Small Regular Script Water Writing Cloth for Calligraphy Practice - Reusable Quick-Dry Mat

Zhong Shaojing Lingfei Jing Small Regular Script Water Writing Cloth for Calligraphy Practice - Reusable Quick-Dry Mat

$22.53

New 968 Fast-Drying Super Glue - Strong Bond for Metal, Magnets, Rubber, and Aluminum Alloy

New 968 Fast-Drying Super Glue - Strong Bond for Metal, Magnets, Rubber, and Aluminum Alloy

$18.20

German Imported Stone Removal Hook Car Tire Stone Cleaning Tool Vehicle Foldable Multi-Function Stone Remover

German Imported Stone Removal Hook Car Tire Stone Cleaning Tool Vehicle Foldable Multi-Function Stone Remover

$11.34

[10% Off for 2 Items] Double-Sided Wool Felt Mat for Calligraphy and Painting, Student Practice Sheet, Brush Writing Desk Pad, Four Treasures of the Study Set

[10% Off for 2 Items] Double-Sided Wool Felt Mat for Calligraphy and Painting, Student Practice Sheet, Brush Writing Desk Pad, Four Treasures of the Study Set

$6.63

In Stock Special Offer: QS18VP6LLPQ8 Sensor - Price Negotiable

In Stock Special Offer: QS18VP6LLPQ8 Sensor - Price Negotiable

$600.00

Broccoli Vegetable Washing Machine for Pre-made Dishes, Water Bath Cleaning Equipment with Bubble System for Herbs and Export-Grade Produce

Broccoli Vegetable Washing Machine for Pre-made Dishes, Water Bath Cleaning Equipment with Bubble System for Herbs and Export-Grade Produce

$615.00

Hongkedou Oxford Fabric Bag-in-Bag Divider Insert, Stiff Makeup Organizer with Zipper, Waterproof Small Women's Pouch

Hongkedou Oxford Fabric Bag-in-Bag Divider Insert, Stiff Makeup Organizer with Zipper, Waterproof Small Women's Pouch

$22.00

Pad Printing Machine Accessories: Positioning Clamps, T-Shaped Holders, and Locking Irons

Pad Printing Machine Accessories: Positioning Clamps, T-Shaped Holders, and Locking Irons

$0.60

Japanese High-Concentration Oxalic Acid Toilet Cleaner, Powerful Urine Scale Remover and Stain Eliminator

Japanese High-Concentration Oxalic Acid Toilet Cleaner, Powerful Urine Scale Remover and Stain Eliminator

$23.82

Biliansheng No-Shave Hair Transplant - Hairline and Crown Thinning Treatment, Hair Loss Detection Service

Biliansheng No-Shave Hair Transplant - Hairline and Crown Thinning Treatment, Hair Loss Detection Service

$86.00

Laorentou Paper Blending Stump for Sketching - Professional Art Supply for Highlighting and Pastel Work

Laorentou Paper Blending Stump for Sketching - Professional Art Supply for Highlighting and Pastel Work

$6.80

Fast-Drying Glue for ABS Plastic - Transparent, High-Strength, Odorless, Non-Whitening Instant Adhesive for ABS and PC Plastics

Fast-Drying Glue for ABS Plastic - Transparent, High-Strength, Odorless, Non-Whitening Instant Adhesive for ABS and PC Plastics

$58.96

Manufacturer Supply Oxygen Absorber Oxygen Generator Stable Performance Hydrogen-Rich Machine Hydrogen Generator

Manufacturer Supply Oxygen Absorber Oxygen Generator Stable Performance Hydrogen-Rich Machine Hydrogen Generator

$5,058.00

POPMART CRYBABY Vacation Mode On - Vinyl Plush Keychain Blind Box

POPMART CRYBABY Vacation Mode On - Vinyl Plush Keychain Blind Box

$106.99

Portable Travel Potty for Kids, Outdoor Toilet, Foldable Car Seat Potty for Babies, Travel Urinal for Outdoors

Portable Travel Potty for Kids, Outdoor Toilet, Foldable Car Seat Potty for Babies, Travel Urinal for Outdoors

$29.90

Wen Zhengming Red Cliff & Tengwang Pavilion Copybook - 2-Volume Running Script Long Scroll for Calligraphy Practice

Wen Zhengming Red Cliff & Tengwang Pavilion Copybook - 2-Volume Running Script Long Scroll for Calligraphy Practice

$22.00

Commercial Food Warmer Cabinet, Double-Layer Display Unit for Western Restaurants and Burger Shops, Wholesale Two-Tier Heating Showcase

Commercial Food Warmer Cabinet, Double-Layer Display Unit for Western Restaurants and Burger Shops, Wholesale Two-Tier Heating Showcase

$2,527.00

Electromagnetic Pulse Valve Blow-Type Submerged Right-Angle Explosion-Proof Solenoid Valve

Electromagnetic Pulse Valve Blow-Type Submerged Right-Angle Explosion-Proof Solenoid Valve

$152.00

Pure Brass Backflow Incense Holder with Wooden Base, Incense Burner Stand for Sandalwood

Pure Brass Backflow Incense Holder with Wooden Base, Incense Burner Stand for Sandalwood

$4.17

Multi-Function Over-Toilet Freestanding Shelf - Bathroom Storage Rack for Sink Area and Behind-Toilet Space

Multi-Function Over-Toilet Freestanding Shelf - Bathroom Storage Rack for Sink Area and Behind-Toilet Space

$958.10

Catalytic Combustion Equipment RCO Activated Carbon Adsorption Desorption Integrated Machine Industrial Plastic Waste Gas Purification Treatment Device

Catalytic Combustion Equipment RCO Activated Carbon Adsorption Desorption Integrated Machine Industrial Plastic Waste Gas Purification Treatment Device

$4,400.00

RoHS Ten Hazardous Substance Alloy Analysis and Coating Thickness Gauge - EDXRF Environmental Testing Instrument

RoHS Ten Hazardous Substance Alloy Analysis and Coating Thickness Gauge - EDXRF Environmental Testing Instrument

$10,856.00

Outes Air Energy Water Heater for Home Heating, Inverter Floor Heating & Central AC All-in-One Unit

Outes Air Energy Water Heater for Home Heating, Inverter Floor Heating & Central AC All-in-One Unit

$18,000.00

2025 Limited Edition Colorful Mesh Tofu Bag - Ultra-Light Breathable Multi-Purpose Storage Pouch

2025 Limited Edition Colorful Mesh Tofu Bag - Ultra-Light Breathable Multi-Purpose Storage Pouch

$11.90

Liupintang Calligraphy Felt Mat – Traditional Chinese Style Cultural Creative Painted Desk Pad for Brush Writing, Practice, and Ink Painting

Liupintang Calligraphy Felt Mat – Traditional Chinese Style Cultural Creative Painted Desk Pad for Brush Writing, Practice, and Ink Painting

$19.30

Shengneng Commercial Air Source Heat Pump Host KFXRS-40â…¡

Shengneng Commercial Air Source Heat Pump Host KFXRS-40â…¡

$45,000.00

Yiyi Electric Pad Printing Ink Cups (150/175/300/380) - Magnetic Doctor Blade Ink Wells for Coding Machines

Yiyi Electric Pad Printing Ink Cups (150/175/300/380) - Magnetic Doctor Blade Ink Wells for Coding Machines

$68.00

ML-150 Standard Material Leveling Machine - Economical and Practical Model

ML-150 Standard Material Leveling Machine - Economical and Practical Model

$11,780.00

3-in-1 Multi-Function Paint Brush Washer with Palette Compartments for Art Students

3-in-1 Multi-Function Paint Brush Washer with Palette Compartments for Art Students

$5.02

Silicone Dental Retainer Case - Portable Storage Box for Orthodontic Aligners & Dentures

Silicone Dental Retainer Case - Portable Storage Box for Orthodontic Aligners & Dentures

$19.30