Skip to main content
Home / Hardware & Tools / Black 304 Stainless Steel Hex Nut, Flat Washer, and Spring Washer Combo Set; Screw Caps M3-M10mm

Attributes

Brand -
Category Root / Hardware & Tools
Origin -
Material 304 Stainless Steel
Finish Black Oxide Coated
Included Components Hex Nuts, Flat Washers, Spring Washers, Screw Caps
Size Range M3, M4, M5, M6, M8, M10
Thread Type Metric Coarse Thread
Hardness Grade Class 8 (Standard for 304 SS)
Corrosion Resistance High (Suitable for Indoor/Outdoor Use)
Package Type Bulk Wholesale Box
Application Machinery, Automotive, DIY Projects, Furniture Assembly
Country of Origin Imported

6 reviews

A

Anonymous

Mar 28, 2026

Rating: 5/5

Perfect assortment for my workshop

This kit has everything I needed for various projects. The black finish looks sleek and professional on my custom furniture builds. The variety of sizes from M3 to M10 is very convenient.

A

Anonymous

Mar 25, 2026

Rating: 5/5

Must-have for bulk buyers

As a small manufacturer, buying in bulk saves us a lot. The consistency in thread quality across all sizes is impressive. No stripped threads or defective pieces found so far.

A

Anonymous

Mar 18, 2026

Rating: 4/5

Good quality, great value

The washers and nuts fit perfectly together. The spring washers provide good tension. Only giving 4 stars because the box was slightly dented upon arrival, but the contents were fine.

A

Anonymous

Mar 17, 2026

Rating: 5/5

Great for automotive repairs

Used these for restoring an old motorcycle. The black stainless steel matches the engine components perfectly. Strong and durable, exactly what 304 steel should be.

A

Anonymous

Mar 17, 2026

Rating: 4/5

Solid hardware set

The screw caps are a nice touch that many other sets don't include. They fit snugly on the bolt ends. The only improvement would be better organization compartments in the box.

A

Anonymous

Mar 06, 2026

Rating: 5/5

Excellent corrosion resistance

I used these for an outdoor garden trellis project. After six months of exposure to rain, there is no sign of rust. The black coating has held up remarkably well.

5 FAQ

Q: What is the approximate count of pieces per size in the bulk box?

A: The quantities vary by size to ensure practical utility, with smaller sizes like M3 and M4 having higher counts than larger sizes like M8 and M10. Please refer to the detailed packing list in the product manual.

Q: Can these be used in marine environments?

A: While 304 Stainless Steel offers good corrosion resistance, we recommend 316 Stainless Steel for direct saltwater or harsh marine environments for maximum longevity.

Q: Does this set include the actual bolts or just the nuts and washers?

A: This specific combo set includes Hex Nuts, Flat Washers, Spring Washers, and Screw Caps. Bolts are sold separately.

Q: Are these nuts compatible with standard metric bolts?

A: Yes, this set is designed specifically for standard metric coarse thread bolts ranging from M3 to M10.

Q: Is the black coating prone to chipping during installation?

A: The black oxide finish is durable, but using proper tools and avoiding excessive torque will help prevent chipping or scratching during installation.

Explore your interests

All Categories
Best Seller (30)
New List (30)
Kids Art DIY Stamp Kit - Round Sponge Daubers, Mushroom Head Stamps, and Paint for Graffiti

Kids Art DIY Stamp Kit - Round Sponge Daubers, Mushroom Head Stamps, and Paint for Graffiti

$2.44

YP8 YP-80000 Book Block Pressing Machine Supply Robust Structure Reliable Application

YP8 YP-80000 Book Block Pressing Machine Supply Robust Structure Reliable Application

$23,790.00

Feileniao Four Seasons Flowers Line Drawing Atlas - Chinese Ink Painting Guide for Brush Beginners

Feileniao Four Seasons Flowers Line Drawing Atlas - Chinese Ink Painting Guide for Brush Beginners

$39.90

365 Days! Drummer Training Plan - Beginner Self-Study Guide for Drum Kits and Jazz Drums with Tutorial Audio

365 Days! Drummer Training Plan - Beginner Self-Study Guide for Drum Kits and Jazz Drums with Tutorial Audio

$55.00

New Rechargeable Electric Incense Making Machine – Compact Home Device for Extruding Coil, Sandalwood, and Stick Incense, Manual Incense Crafting Equipment

New Rechargeable Electric Incense Making Machine – Compact Home Device for Extruding Coil, Sandalwood, and Stick Incense, Manual Incense Crafting Equipment

$268.00

Tire Stone Removal Hook, Multi-Function Tool with Built-in Screwdriver for Window Breaking and Self-Defense

Tire Stone Removal Hook, Multi-Function Tool with Built-in Screwdriver for Window Breaking and Self-Defense

$7.51

Pearl Sand Wax, Ice Flower Wax, Floating Aromatherapy Candle Colored Suspended Particles for Atmosphere Decor and DIY Crafts

Pearl Sand Wax, Ice Flower Wax, Floating Aromatherapy Candle Colored Suspended Particles for Atmosphere Decor and DIY Crafts

$5.78

No-Drill Wall-Mounted Toilet Paper Holder and Storage Shelf for Bathroom

No-Drill Wall-Mounted Toilet Paper Holder and Storage Shelf for Bathroom

$19.30

Chain Sling Lifting Shackle Steel Chain Single Leg with Hooks on Both Ends for Towing, 2m Length, 5 Ton Capacity

Chain Sling Lifting Shackle Steel Chain Single Leg with Hooks on Both Ends for Towing, 2m Length, 5 Ton Capacity

$79.00

120L Milk Pasteurizer, Homogenizing Mixer, and Ice Cream Aging Machine - Factory Supply

120L Milk Pasteurizer, Homogenizing Mixer, and Ice Cream Aging Machine - Factory Supply

$59,892.00

LUBOSHI Automatic Retractable Hose Reel 12MM Water Drum PVC Braided Hose for Car Wash, Gardening, and Auto Repair - 15 Meters

LUBOSHI Automatic Retractable Hose Reel 12MM Water Drum PVC Braided Hose for Car Wash, Gardening, and Auto Repair - 15 Meters

$383.00

No-Drill Over-Toilet Storage Rack - Wall-Mounted Bathroom Organizer for Tank Gap

No-Drill Over-Toilet Storage Rack - Wall-Mounted Bathroom Organizer for Tank Gap

$19.84

Commercial Automatic Multi-Function Vegetable Cutter for Slicing, Dicing, and Shredding

Commercial Automatic Multi-Function Vegetable Cutter for Slicing, Dicing, and Shredding

$1,782.00

Zhonglian Hamburger Food Warmer Display Cabinet 1.2m 1.5m 3-in-1 Warmer Double-Layer Display Cabinet Crisp Keeper

Zhonglian Hamburger Food Warmer Display Cabinet 1.2m 1.5m 3-in-1 Warmer Double-Layer Display Cabinet Crisp Keeper

$3,376.00

A3 Watercolor Paper 300g Thickened Cotton Pulp Fine Grain, A4 Medium Grain for Beginners, 4K Wood Pulp Cotton Blank Hand-Painting Paper, Square Art Coloring Paper, Postcard & Bookmark Paper

A3 Watercolor Paper 300g Thickened Cotton Pulp Fine Grain, A4 Medium Grain for Beginners, 4K Wood Pulp Cotton Blank Hand-Painting Paper, Square Art Coloring Paper, Postcard & Bookmark Paper

$18.90

Sketch Gray Tone Pencils for Art Students, Detail Highlight Blending Stumps, Makeup Sponge Pens, Quick Sketch Eraser Pen Sets

Sketch Gray Tone Pencils for Art Students, Detail Highlight Blending Stumps, Makeup Sponge Pens, Quick Sketch Eraser Pen Sets

$6.46

Disposable Vacuum Cleaner Filter Mesh - Non-Woven Dust Bag with Elastic Band for Home Use

Disposable Vacuum Cleaner Filter Mesh - Non-Woven Dust Bag with Elastic Band for Home Use

$4.50

Systematic 3D Painting Learning Package (Includes 100 Lessons)

Systematic 3D Painting Learning Package (Includes 100 Lessons)

$798.00

6/8/12Pcs Silicone Red Wine Glass Identification Marker Char

6/8/12Pcs Silicone Red Wine Glass Identification Marker Char

$27.44

Stainless Steel Sink Drain Basket – Expandable Kitchen Dish and Vegetable Rack

Stainless Steel Sink Drain Basket – Expandable Kitchen Dish and Vegetable Rack

$12.35

Tungsten Carbide Internal Thread Tool Holder – Anti-Vibration CNC Turning Insert for Small Bore Threading (CNR)

Tungsten Carbide Internal Thread Tool Holder – Anti-Vibration CNC Turning Insert for Small Bore Threading (CNR)

$73.02

Henkel Loctite SICOMET 8400 77 99 40 50 Instant Adhesive for Metal and Rubber with BS Accelerator

Henkel Loctite SICOMET 8400 77 99 40 50 Instant Adhesive for Metal and Rubber with BS Accelerator

$69.00

Colored Pencil Set, Basswood Hexagonal Raw Wood Pencils for Painting and Art Coloring

Colored Pencil Set, Basswood Hexagonal Raw Wood Pencils for Painting and Art Coloring

$21.68

Small Ceramic Herb Jar – Imperial Yellow Hexagonal Double-Layer Container for Angong Niuhuang Wan Pills

Small Ceramic Herb Jar – Imperial Yellow Hexagonal Double-Layer Container for Angong Niuhuang Wan Pills

$8.80

Spanish Brush Master ESCODA PERLA Pearl White Toray Nylon Round Watercolor Brush, Short Handle 1430

Spanish Brush Master ESCODA PERLA Pearl White Toray Nylon Round Watercolor Brush, Short Handle 1430

$44.20

Qiwei COD Rapid Detector QW-COD-T/B - Chemical Oxygen Demand Tester with Potassium Dichromate Digestion for Wastewater

Qiwei COD Rapid Detector QW-COD-T/B - Chemical Oxygen Demand Tester with Potassium Dichromate Digestion for Wastewater

$3,330.16

Natural Wheat Straw Baby Rattle - Children's Musical Instrument Toy, Maraca, Shaker Bell for Newborns - Orff Music Instrument

Natural Wheat Straw Baby Rattle - Children's Musical Instrument Toy, Maraca, Shaker Bell for Newborns - Orff Music Instrument

$10.80

CANDLE.LAB | 100% Cotton Unwaxed Candle Wick Roll - Thin Stem Chandelier Candle Making Supplies #31

CANDLE.LAB | 100% Cotton Unwaxed Candle Wick Roll - Thin Stem Chandelier Candle Making Supplies #31

$25.00

Pneumatic Rotary Vibrator - Feiyu GT25 Pneumatic Vibrator - Quality Guaranteed

Pneumatic Rotary Vibrator - Feiyu GT25 Pneumatic Vibrator - Quality Guaranteed

$997.00

Quick-Frozen Vegetable Deodorizing Sterilization Washer IRW Zhongfang Ready-to-Cook Vegetable Production Washing Line Semi-Finished Vegetable Processing Oxygen Equipment

Quick-Frozen Vegetable Deodorizing Sterilization Washer IRW Zhongfang Ready-to-Cook Vegetable Production Washing Line Semi-Finished Vegetable Processing Oxygen Equipment

$27,000.00