Skip to main content
Home / Screws / 304 Stainless Steel Extra Large Extra Long Full Thread Socket Head Cap Screw Cylinder Head Screw M3 M4 M5 M6 M8-M30

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material 304 Stainless Steel
Head Style Socket Head Cap (Cylinder)
Drive Type Hex Socket (Allen)
Thread Type Full Thread (Coarse)
Available Sizes M3, M4, M5, M6, M8, M10, M12, M16, M20, M24, M30
Finish Polished Silver
Strength Grade A2-70
Corrosion Resistance High (Suitable for damp environments)
Application Machinery, Automotive, Construction, DIY Projects
Package Content Assorted Kit or Bulk Pack (Selected at Checkout)

6 reviews

A

Anonymous

Mar 17, 2026

Rating: 5/5

Perfect for machinery repair

Used the M8 and M10 sizes to repair a conveyor belt mechanism. The hex socket fits perfectly with standard Allen keys, and the full thread provided excellent grip.

A

Anonymous

Mar 12, 2026

Rating: 4/5

Good variety but packaging could be better

The screws themselves are great quality and the threads are precise. However, the small sizes were all mixed together in one bag. Would prefer separate compartments for each size.

A

Anonymous

Mar 08, 2026

Rating: 5/5

Excellent quality stainless steel

These screws are exactly what I needed for my outdoor project. The 304 stainless steel feels robust and the finish is very clean. No signs of rust after a few weeks in the rain.

A

Anonymous

Mar 07, 2026

Rating: 5/5

Great value for bulk purchase

Bought the M4 and M5 assortment for general workshop use. The price per unit is unbeatable compared to local hardware stores. Will definitely buy again.

A

Anonymous

Mar 07, 2026

Rating: 5/5

Heavy duty and reliable

Needed extra long screws for a custom furniture build. These M6 extra-long variants were perfect. Very sturdy and the cylinder head looks professional.

A

Anonymous

Mar 07, 2026

Rating: 3/5

Decent but some heads were stripped

Most of the screws are fine, but I found about three in the pack where the hex socket was slightly deformed, making them hard to drive. The rest worked flawlessly.

5 FAQ

Q: Do you sell matching nuts and washers for this set?

A: Yes, we offer compatible 304 stainless steel hex nuts and flat washers in all corresponding sizes. Please check the 'Related Products' section on the product page.

Q: Can I return the item if I selected the wrong size?

A: Absolutely. As long as the items are unused and in original packaging, you can initiate a return within 30 days of delivery for a full refund or exchange.

Q: Are these screws suitable for marine environments?

A: While 304 stainless steel offers good corrosion resistance, for constant exposure to saltwater, we recommend our 316 stainless steel series for superior protection.

Q: Is there a certificate of material compliance included?

A: For bulk orders over 500 units, a material test report (MTR) can be provided upon request. For smaller kits, general specification sheets are available for download.

Q: What is the tensile strength of these M6 screws?

A: These screws are graded A2-70, which indicates a minimum tensile strength of 700 MPa.

Explore your interests

View More
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