Skip to main content
Home / Screws / 304 Stainless Steel Socket Head Cap Screw Cylinder Head Cup Head Extended Bolt M2 M3 M4 M5 M6 M8 M10 M12

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material 304 Stainless Steel
Head Style Socket Head Cap (Cylinder/Cup)
Drive Type Internal Hex (Allen)
Thread Standard Metric Coarse
Available Sizes M2, M3, M4, M5, M6, M8, M10, M12
Finish Polished Silver
Hardness Grade A2-70
Corrosion Resistance High (Suitable for damp environments)
Package Contents Assorted Kit with Storage Box
Application Machinery, Electronics, Furniture Assembly

6 reviews

A

Anonymous

Mar 26, 2026

Rating: 5/5

Perfect fit for my project

These screws are exactly what I needed for my 3D printer assembly. The 304 stainless steel feels very durable and the hex heads didn't strip even under high torque.

A

Anonymous

Mar 25, 2026

Rating: 5/5

Great value kit

Having all these sizes in one box is so convenient. The storage case keeps them organized, and the price is unbeatable compared to buying individual packs.

A

Anonymous

Mar 24, 2026

Rating: 5/5

Excellent corrosion resistance

I used these for an outdoor garden fixture. After three months of rain and sun, there is absolutely no sign of rust. Highly recommend for outdoor use.

A

Anonymous

Mar 13, 2026

Rating: 5/5

Professional grade quality

As a mechanical engineer, I appreciate the consistent machining on these cap screws. The head height is uniform, and the finish is smooth.

A

Anonymous

Mar 12, 2026

Rating: 4/5

Good quality, slight size variance

Overall great set. The M4 and M6 sizes were perfect, but a couple of the M3 bolts seemed slightly shorter than standard. Still usable for most applications.

A

Anonymous

Mar 10, 2026

Rating: 3/5

Decent but threads could be sharper

The material is good, but I found the threads on the M8 bolts were a bit hard to start without a tap. Once started, they tightened fine.

5 FAQ

Q: Can these withstand high temperatures?

A: 304 Stainless Steel maintains its strength up to approximately 870°C (1600°F) for intermittent service, making them suitable for most engine bay or machinery applications.

Q: Is the thread full length or partial?

A: For sizes M2 through M6, the threads are typically full length. For M8 and larger, the threads are partial according to ISO 4762 standards.

Q: Do you sell a matching hex key tool with this?

A: The kit does not include tools, but standard metric hex keys (Allen wrenches) available at any hardware store will fit these socket heads perfectly.

Q: What is the length range included in this kit?

A: This specific assortment includes lengths ranging from 4mm to 50mm depending on the diameter selected. Please check the detailed size chart in the product images.

Q: Are these screws compatible with aluminum parts?

A: Yes, 304 stainless steel is generally compatible with aluminum, though we recommend using an anti-seize compound to prevent galvanic corrosion in wet environments.

Explore your interests

All Categories
Best Seller (30)
New List (30)
Handcrafted Sheepskin Rattle & Peach Wood Shaker - Pure Copper Brass Bells, Vintage Wooden Toy Safe for Infant Chewing

Handcrafted Sheepskin Rattle & Peach Wood Shaker - Pure Copper Brass Bells, Vintage Wooden Toy Safe for Infant Chewing

$31.50

RIDE ON TIME Tatsuro Yamashita Mr. Fuki Saxophone Trio Accurate Transcription Service

RIDE ON TIME Tatsuro Yamashita Mr. Fuki Saxophone Trio Accurate Transcription Service

$34.00

Metal Unveiling Stand for Ribbon-Cutting Ceremonies - Vertical Display Rack for Grand Openings, Advertising Signs, and Plaques

Metal Unveiling Stand for Ribbon-Cutting Ceremonies - Vertical Display Rack for Grand Openings, Advertising Signs, and Plaques

$159.00

Children's Art Supplies Round Sponge Brush Painting Graffiti Tool Mushroom Head Stamp Kindergarten DIY Rubbing Art

Children's Art Supplies Round Sponge Brush Painting Graffiti Tool Mushroom Head Stamp Kindergarten DIY Rubbing Art

$2.45

Weak Alkaline Water Equipment Wahaha 9.0 Soda Water Small Molecule Water Stable Storage for 24 Months Electrolysis Water Maker

Weak Alkaline Water Equipment Wahaha 9.0 Soda Water Small Molecule Water Stable Storage for 24 Months Electrolysis Water Maker

$20,160.00

RefComp Snowman Italy Refcon Low-Temperature Cold Storage Semi-Hermetic Unit SP2L 0600 (55㎡ Dual)

RefComp Snowman Italy Refcon Low-Temperature Cold Storage Semi-Hermetic Unit SP2L 0600 (55㎡ Dual)

$7,200.00

Compact Home Range Hood - Portable USB Desktop Smoke Extractor for Living Room Hot Pot and BBQ Odor Removal

Compact Home Range Hood - Portable USB Desktop Smoke Extractor for Living Room Hot Pot and BBQ Odor Removal

$39.00

IoT Leakage Circuit Breaker with Remote Control via EasyLink, Featuring Metering and Protection

IoT Leakage Circuit Breaker with Remote Control via EasyLink, Featuring Metering and Protection

$510.75

Mia Art Quick-Absorb Sponge for Watercolor Painting - Soft, Durable, Brush-Safe Cleaning and Blending Tool for Students

Mia Art Quick-Absorb Sponge for Watercolor Painting - Soft, Durable, Brush-Safe Cleaning and Blending Tool for Students

$4.25

Incense Burner Pad with Fire-Resistant Cotton - High-Temperature Resistant, Heat-Proof, Home Use, Round Insulating Flame-Retardant Mat for Incense Boxes and Aromatherapy

Incense Burner Pad with Fire-Resistant Cotton - High-Temperature Resistant, Heat-Proof, Home Use, Round Insulating Flame-Retardant Mat for Incense Boxes and Aromatherapy

$3.29

Quilt Storage Bag for Clothes, Cotton Quilts, and Down Jackets - Large Capacity Moving Luggage Compression Organizer

Quilt Storage Bag for Clothes, Cotton Quilts, and Down Jackets - Large Capacity Moving Luggage Compression Organizer

$11.80

Welding Fume Purifier – Effective Dust Collection and Control

Welding Fume Purifier – Effective Dust Collection and Control

$15,740.00

Discount Cocktail Bun and Sausage Bun Electric Heated Display Cabinet for Egg Tarts and Roasted Sweet Potatoes

Discount Cocktail Bun and Sausage Bun Electric Heated Display Cabinet for Egg Tarts and Roasted Sweet Potatoes

$7,633.00

Paint Brush Cleaner with Suction Pump for Watercolor, Gouache, and Acrylics - Essential Tool for Artists

Paint Brush Cleaner with Suction Pump for Watercolor, Gouache, and Acrylics - Essential Tool for Artists

$14.80

Anserui Portable Tire Stone Removal Hook - Multi-Function Car Tire Cleaning Tool

Anserui Portable Tire Stone Removal Hook - Multi-Function Car Tire Cleaning Tool

$23.32

New 420D Oxford Cloth Black Outdoor Leaf Blower Vacuum Bag, Yard Debris Collection and Storage Bag

New 420D Oxford Cloth Black Outdoor Leaf Blower Vacuum Bag, Yard Debris Collection and Storage Bag

$26.00

RoHS Environmental Protection Tester for Electronic Component Solder Joints and PCB Lead/Heavy Metal Detection

RoHS Environmental Protection Tester for Electronic Component Solder Joints and PCB Lead/Heavy Metal Detection

$6,580.00

[Blueberry Midsummer] Qianmu Original Pastoral Lolita Daily JSK Dress, Full Length

[Blueberry Midsummer] Qianmu Original Pastoral Lolita Daily JSK Dress, Full Length

$128.00

Watercolor Coloring Line Art Paper - Gourmet Theme Cotton Pulp Sketchbook for Tracing and Creativity

Watercolor Coloring Line Art Paper - Gourmet Theme Cotton Pulp Sketchbook for Tracing and Creativity

$12.80

Industrial Boiler Oxygen-Enriched Combustion System - Technical Specs for Industrial Oxygen Generators

Industrial Boiler Oxygen-Enriched Combustion System - Technical Specs for Industrial Oxygen Generators

$1,135,199.00

Tanker Truck and Modified Trailer Rear Axle Tires - 445/65R22.5, 425/65R22.5, 385/65R22.5

Tanker Truck and Modified Trailer Rear Axle Tires - 445/65R22.5, 425/65R22.5, 385/65R22.5

$1,500.00

Ancient Craft Mini Peach Wood Rattle Drum Traditional Intangible Cultural Heritage Custom Handmade Toy for Infants

Ancient Craft Mini Peach Wood Rattle Drum Traditional Intangible Cultural Heritage Custom Handmade Toy for Infants

$198.00

Welding Fume Purifier Mobile Welding Fume Extractor Electric Welding Dust Removal Equipment Welding Fume Machine

Welding Fume Purifier Mobile Welding Fume Extractor Electric Welding Dust Removal Equipment Welding Fume Machine

$5,200.00

Japanese Imported Invisible Retainer Case - Portable Cleaning and Soaking Box for Children's Orthodontic Aligners and Dentures

Japanese Imported Invisible Retainer Case - Portable Cleaning and Soaking Box for Children's Orthodontic Aligners and Dentures

$8.42

Promotional Giveaways for Schools - Cartoon Whistles and Rattles for Marketing and Lead Generation

Promotional Giveaways for Schools - Cartoon Whistles and Rattles for Marketing and Lead Generation

$3.29

Premium Used Car Tires in Sizes 145-225, 80-90% New Condition

Premium Used Car Tires in Sizes 145-225, 80-90% New Condition

$54.00

Original Car Tires - Used Passenger Van Tires in Sizes 175/185/195/205 R13/R14/R15/R16/R17

Original Car Tires - Used Passenger Van Tires in Sizes 175/185/195/205 R13/R14/R15/R16/R17

$59.00

BeeNesting Waterproof Bag, Wet/Dry Separation, Large Capacity Storage for Swimming, Beach, Camping, Travel, Outdoor 12+20L

BeeNesting Waterproof Bag, Wet/Dry Separation, Large Capacity Storage for Swimming, Beach, Camping, Travel, Outdoor 12+20L

$33.10

Custom Acrylic UV Printed Advertising Signs - Office Door Plates, ID Tags, Number Plaques, and Small Signboards

Custom Acrylic UV Printed Advertising Signs - Office Door Plates, ID Tags, Number Plaques, and Small Signboards

$1.00

Car Tire Stone Removal Tool - Hook Pick for Cleaning Gravel from Vehicle Treads

Car Tire Stone Removal Tool - Hook Pick for Cleaning Gravel from Vehicle Treads

$4.53