Skip to main content
Home / Screws / M3 M4 M5 M6 M8 M10 M12 304 Stainless Steel Socket Head Three-Piece Combination Screw Flat Spring Washer Integrated Bolt

Attributes

Brand -
Category Standard Parts, Components & Industrial Consumables / Screws
Origin -
Material 304 Stainless Steel
Head Style Socket Head (Allen Drive)
Available Sizes M3, M4, M5, M6, M8, M10, M12
Configuration Three-Piece Integrated (Screw + Flat Washer + Spring Washer)
Thread Type Metric Coarse Thread
Finish Polished Silver
Corrosion Resistance High (Suitable for Indoor and Outdoor Use)
Application Machinery, Electronics, Automotive, and Furniture Assembly
Drive Size Varies by Screw Diameter (Hex Key Required)
Package Content Assorted Kit with Storage Case

6 reviews

A

Anonymous

Mar 27, 2026

Rating: 5/5

Essential for machinery repair

I use these for repairing conveyor belt guides. The combination of the spring washer prevents loosening due to vibration effectively. Highly recommend for any mechanical application.

A

Anonymous

Mar 14, 2026

Rating: 4/5

Good variety pack

The kit covers all the common sizes I need. The M6 and M8 sizes are my most used. Only wish the case had better labeling for each compartment, but the screws themselves are top-notch.

A

Anonymous

Mar 11, 2026

Rating: 4/5

Great quality, slightly tight fit

The stainless steel quality is excellent and they look great. The washers are held on tightly, which is good for shipping but required a bit of extra torque to start threading. Overall very satisfied.

A

Anonymous

Mar 08, 2026

Rating: 5/5

Convenient and rust-resistant

Bought these for an outdoor garden bench project. After several months of exposure to rain, there is no sign of rust. The integrated design makes installation much faster.

A

Anonymous

Mar 08, 2026

Rating: 5/5

Professional grade fasteners

As an electronics assembler, precision matters. These screws have clean threads and the hex heads don't strip easily. The three-piece combo ensures a secure connection every time.

A

Anonymous

Mar 03, 2026

Rating: 5/5

Perfect all-in-one solution

These integrated screws save so much time during assembly. Having the flat and spring washers pre-attached is a game changer for my workshop projects. The 304 steel feels very durable.

5 FAQ

Q: What is the hardness rating of these bolts?

A: These are standard 304 Stainless Steel fasteners, typically corresponding to a strength class of A2-70, which is suitable for most general industrial and commercial applications.

Q: Can the washers be removed if I only need the screw?

A: The washers are designed to stay attached during installation for convenience. While they can be forced off, it may damage the finish. We recommend using them as an integrated unit.

Q: Are these suitable for marine environments?

A: While 304 Stainless Steel offers good corrosion resistance, for constant exposure to saltwater or harsh marine environments, we recommend 316 Stainless Steel for superior protection.

Q: Do these screws come with the Allen key needed to install them?

A: No, this kit includes only the integrated screws. You will need to use your own metric hex key set appropriate for the specific screw size you are using.

Q: Is there a bulk discount available for ordering multiple kits?

A: Yes, we offer tiered pricing for bulk orders. Please contact our sales team directly or add large quantities to your cart to see the automatic discount applied at checkout.

Explore your interests

All Categories
Best Seller (30)
New List (30)
Commercial Roast Duck Warmer Display Cabinet, Countertop Heating Unit for Crispy Pork Belly, Roast Meat, and Goose

Commercial Roast Duck Warmer Display Cabinet, Countertop Heating Unit for Crispy Pork Belly, Roast Meat, and Goose

$444.50

Variable Frequency Drive 7.5KW Brand New Original

Variable Frequency Drive 7.5KW Brand New Original

$2,312.00

Inverted Water Dispenser Stand for Pure Water, Office Drinking Water Rack, Convenience Store and Supermarket Shelf

Inverted Water Dispenser Stand for Pure Water, Office Drinking Water Rack, Convenience Store and Supermarket Shelf

$116.79

RSL Electric Guitar Series by Rockschool - ABRSM Edition 2018 Update, Grades 0-8 Complete 9-Volume Set

RSL Electric Guitar Series by Rockschool - ABRSM Edition 2018 Update, Grades 0-8 Complete 9-Volume Set

$30.00

Handmade Soap and Baking Cake Silicone Mold - Round 6-Cavity

Handmade Soap and Baking Cake Silicone Mold - Round 6-Cavity

$16.50

Meile Childhood Sponge Stamp Set - Kids' Paint Printing Tools with Sponge Brushes for Kindergarten Art

Meile Childhood Sponge Stamp Set - Kids' Paint Printing Tools with Sponge Brushes for Kindergarten Art

$14.30

2019 Jiangxi Isuzu Ruimai Lingtuo DMAX - Brand New Original Thickened Wear-Resistant Tires

2019 Jiangxi Isuzu Ruimai Lingtuo DMAX - Brand New Original Thickened Wear-Resistant Tires

$302.80

Pirelli P7 Run-Flat Tires 225 245 255 275 35 40 45 50 R17 18 19 20 21

Pirelli P7 Run-Flat Tires 225 245 255 275 35 40 45 50 R17 18 19 20 21

$340.00

Lint-Free Industrial Wiping Cloth - Oil-Removing Absorbent Paper for Car Paint Wax and Grease Removal

Lint-Free Industrial Wiping Cloth - Oil-Removing Absorbent Paper for Car Paint Wax and Grease Removal

$123.00

Henkel Loctite 495 Adhesive Genuine 401 406 416 460 496 Instant Glue Strong Industrial Adhesive for Metal and Plastic

Henkel Loctite 495 Adhesive Genuine 401 406 416 460 496 Instant Glue Strong Industrial Adhesive for Metal and Plastic

$6.00

Industrial Ultrasonic Emulsification and Dispersion System - Anti-Foam Vibration for Pipeline Inner Wall Cleaning

Industrial Ultrasonic Emulsification and Dispersion System - Anti-Foam Vibration for Pipeline Inner Wall Cleaning

$31,250.00

Commercial Small Electric Food Warmer Display Case for Fried Chicken, Burgers, Pies, Egg Tarts, and Youtiao - Constant Temperature Heating Cabinet for Breakfast

Commercial Small Electric Food Warmer Display Case for Fried Chicken, Burgers, Pies, Egg Tarts, and Youtiao - Constant Temperature Heating Cabinet for Breakfast

$623.00

Universal Triangular Stand for Mineral Water Bottles – Inverted Dispenser Rack for Water Coolers and Bottled Water Extraction

Universal Triangular Stand for Mineral Water Bottles – Inverted Dispenser Rack for Water Coolers and Bottled Water Extraction

$5.10

Manufacturer Supply By-Product Cleaning Equipment, Fully Automatic Cylindrical Pig Tripe Degreaser and Cleaner for Cattle and Sheep Stomachs

Manufacturer Supply By-Product Cleaning Equipment, Fully Automatic Cylindrical Pig Tripe Degreaser and Cleaner for Cattle and Sheep Stomachs

$1,600.00

CANDLE.LAB | DIY Aromatherapy Candle Supplies, Natural Refined White Beeswax Pellets, Handmade Soap Materials #27

CANDLE.LAB | DIY Aromatherapy Candle Supplies, Natural Refined White Beeswax Pellets, Handmade Soap Materials #27

$9.00

No-Shave Hair Transplant by Yongxiang Dean Team [Premium Customization], Unlimited Graft Count, Pain Management for Transplant Area

No-Shave Hair Transplant by Yongxiang Dean Team [Premium Customization], Unlimited Graft Count, Pain Management for Transplant Area

$200,000.00

Kitchen Sink Drainage Mat - Sloped Countertop Drying Pad with Foldable Narrow Edges, Faucet Splash Guard, Storage Mat

Kitchen Sink Drainage Mat - Sloped Countertop Drying Pad with Foldable Narrow Edges, Faucet Splash Guard, Storage Mat

$3.57

UE5 Unreal Engine 5.2-5.7 Physical Assembly System Physics Plugin

UE5 Unreal Engine 5.2-5.7 Physical Assembly System Physics Plugin

$0.50

[Damai Holds Micro-Needle Hair Transplant Patent] Female Hairline | Non-Shaven Transplant 1000 Units | Forehead

[Damai Holds Micro-Needle Hair Transplant Patent] Female Hairline | Non-Shaven Transplant 1000 Units | Forehead

$17,000.00

Air Baffle for ABB ACS550-X2 R8 IP21 VFD

Air Baffle for ABB ACS550-X2 R8 IP21 VFD

$3,450.00

Outdoor Waterproof Shockproof EDC Storage Box, Sealed Gear Case for Small Items

Outdoor Waterproof Shockproof EDC Storage Box, Sealed Gear Case for Small Items

$5.10

Zhizhi Lin Zexu Small Regular Script Diamond Character Card Kaishu Copybook Porcelain Blue Gold Characters Brush Calligraphy Practice Folding Card

Zhizhi Lin Zexu Small Regular Script Diamond Character Card Kaishu Copybook Porcelain Blue Gold Characters Brush Calligraphy Practice Folding Card

$68.00

Maotaizi Dual-Tip Dual-Color Glitter Markers for Kids - Non-Toxic Soft Tip Colored Pens for Elementary Art

Maotaizi Dual-Tip Dual-Color Glitter Markers for Kids - Non-Toxic Soft Tip Colored Pens for Elementary Art

$16.90

Tire Removal Socket Wrench and Spare Tire Tool Kit for Zhengzhou Nissan Paladin, Aoting, and Dongfeng Ruiqi Pickup Trucks

Tire Removal Socket Wrench and Spare Tire Tool Kit for Zhengzhou Nissan Paladin, Aoting, and Dongfeng Ruiqi Pickup Trucks

$16.90

Zhimo Ke Xingkai Technique Calligraphy Copybook - Upgraded Edition with Text, Images, and Video Tutorials for Beginners

Zhimo Ke Xingkai Technique Calligraphy Copybook - Upgraded Edition with Text, Images, and Video Tutorials for Beginners

$30.60

Small-Scale Yogurt Processing Production Line, Blended Yogurt Fermentation Equipment, Organic Milk Filling Machine

Small-Scale Yogurt Processing Production Line, Blended Yogurt Fermentation Equipment, Organic Milk Filling Machine

$115,920.00

Compact Manual Hot Stamping Machine for Logos, Business Cards, Leather Wallets, Plastic, and Wood - Heat Embossing and Branding Tool

Compact Manual Hot Stamping Machine for Logos, Business Cards, Leather Wallets, Plastic, and Wood - Heat Embossing and Branding Tool

$500.76

DIY Handmade Soap Mold – Single Square Silicone Mold for Homemade Soap

DIY Handmade Soap Mold – Single Square Silicone Mold for Homemade Soap

$1.96

Wall-Mounted Facial Towel Dispenser Transparent Upside-Down Design

Wall-Mounted Facial Towel Dispenser Transparent Upside-Down Design

$4.50

Colorful Ground Thread Inserts 16ER/IR1.0/2.0/3.0/3.5 ISO AG55/60 for High-Hardness Quenched Steel

Colorful Ground Thread Inserts 16ER/IR1.0/2.0/3.0/3.5 ISO AG55/60 for High-Hardness Quenched Steel

$19.80