Best Metric Bolt Kits: Smooth Projects, One Kit

Are you looking for the best metric bolt kits to make every project feel smoother?
This guide gives you a clear, engaging look at the top kits so you can choose with confidence.

Strong tools make every project feel smooth. Good kits save time. Good kits build trust.
The best metric bolt sets do all three.

You feel the difference when every bolt, nut, and washer fits right. You feel in control. You feel ready for any task.

This guide shows you the top kits. It keeps things simple. It helps you choose with confidence.
You’ll know exactly what to get next.

List of Top 10 Metric Bolt Kits

Title	Best For	Price
Bonost 1380pcs Nuts and Bolts Assortment Kit – Heavy Duty Grade 8.8 Metric M4 M5 M6 M8 Bolt Set with Assorted Nuts and Washers, Yellow Zinc Plated, Length from 12-30mm	This kit is great for DIY fans, mechanics, and anyone who wants strong, ready-to-use nuts and bolts for quick fixes. It also works well for people who build or repair things at home and need reliable hardware on hand.	View on Amazon (paid link)
Taiss 3160PCS Metric Flange Bolt Assortment Kit,Nuts and Bolts Assortment Kit M2 M3 M4 M5 M6x1.0 M8x1.25 M10x1.5 Bolt(4-45mm)42 Sizes Hex Socket Button & Cap Head Metric Screw 10.9 Black Zinc Plated	This kit is perfect for anyone who loves simple, strong, and ready-to-use hardware. It suits builders, makers, and anyone who wants a full set of bolts on hand.	View on Amazon (paid link)
Kadrick Metric Screw Assortment, 2000PCS Metric Bolt Assortment Kit M2 M3 M4 M5 Machine Screws with Lock & Flat Washers, Grade 10.9 Alloy Steel Hex Socket Button Head Black Screws Nuts and Bolts Kit	This Kadrick Metric Screw Assortment is perfect for DIY enthusiasts, 3D printing hobbyists, and electronics repairers. It’s ideal for small, precise projects like robotics, RC models, and electronics, offering durable, organized, and easy-to-use screws, nuts, and washers.	View on Amazon (paid link)
900PCS Metric Bolt Assortment, M6 M8 M10 M12 Grade 8.8 Bolts and Nuts Kit, Nut and Bolt Assortment, Nuts and Bolts, Metric Bolt Kit, Yellow Zinc Plated Coating, 18 Sizes	This kit is perfect for handymen, DIY hobbyists, and small‑shop mechanics who need a fast, tidy way to grab the right bolt or nut. It also works great for electricians, plumbers, and garage owners who want reliable, rust‑proof fasteners on hand.	View on Amazon (paid link)
wugongshan 1080 Pcs Screws Bolts and Nuts Assortment Kit, Metric Machine Screws and Nuts and Flat Washers, M3/M4/M5/M6 Cross Slotted Round Head Bolts Sets (C)	This kit is perfect for home repairs and builders. It is great for fixing a broken chair or working on DIY projects. The set includes many strong parts like bolts, nuts, and washers. The box keeps everything neat and easy to find. It works well on wood and metal. These tools are easy to use and help save time and money. Every handyman should have this useful set to keep their house in top shape.	View on Amazon (paid link)
Fgruh 2200PCS M2 M3 M4 M5 Metric Screws Assortment Kit, Hex Socket Button Head Assorted kit, Machine Screw Set with Nuts & Washers,10.9 Alloy Steel Black Zinc Plated for 3D Printing	This set is perfect for DIY fans, makers, and pros who need strong, well‑sorted hardware. It’s also great for anyone who wants reliable screws ready for any project.	View on Amazon (paid link)
Fgruh 1220PCS M3 M4 M5 M6 Metric Screws Assortment Kit,Hex Socket Head Cap Bolts Nuts and Washers Assorted Kit,304 Stainless Steel Hardware Set for DIY, 3D Printer	This set is perfect for DIY fans, 3D printer users, and anyone who needs strong, easy‑to-use hardware for quick fixes. It also suits people who want neat, ready-to-go parts for clean and simple work.	View on Amazon (paid link)
Kadrick 700Pcs Grade 8.8 Metric Bolt Assortment, M6 M8 M10 Flange Hex Heavy Duty Bolts and Nuts Kit,M6 x1.0 M8 x1.25 M10-1.25 (12mm to 45mm),Eco-Friendly Zinc Plated	This set is perfect for builders, DIY fans, and anyone who wants strong, ready-to-use bolts and nuts on hand. It also fits anyone who needs a reliable, heavy‑duty kit for quick fixes.	View on Amazon (paid link)
Metric Class 10.9 Hex Cap Screws Bolts, Nuts, & Washers Assortment Kit – 575 Pieces!	This kit is perfect for mechanics, builders, and DIY users who need strong parts that fit many jobs. It is also great for anyone who wants a neat, easy-to-use set with bolts, nuts, and washers in one tray.	View on Amazon (paid link)
Bonost 3010pcs Hardware Assortment Kit with Assorted SAE & Metric Phillips Head Bolts, and Grade 8.8 Metric Hex Bolt Set with Matching Nuts and Lock Washers (4 Trays)	This kit is perfect for anyone who needs to fix things around the house. It is great for DIY fans, makers, and new homeowners. The neat case keeps all the bolts and nuts in order. Use it for small repairs or big projects. It is a simple, handy set for all your needs.	View on Amazon (paid link)

Detailed Reviews

Discover the top 10 Metric Bolt Kits—hand‑picked by experts and loved by users for their durability, value, and ease of use.
Each kit is packed with high‑grade bolts, nuts, and washers that fit perfectly in any project, from DIY to professional work.
Read on to find the ideal set that matches your needs and gives you confidence in every fastener.

1. Bonost 1380pcs Nuts and Bolts Assortment Kit – Heavy Duty Grade 8.8 Metric M4 M5 M6 M8 Bolt Set with Assorted Nuts and Washers, Yellow Zinc Plated, Length from 12-30mm

Bonost 1380pcs Nuts and Bolts Assortment Kit - Heavy Duty Grade 8.8 Metric M4 M5 M6 M8 Bolt Set with Assorted Nuts and Washers, Yellow Zinc Plated, Length from 12-30mm

The Bonost 1380pcs Nuts and Bolts Kit gives you strong parts that are easy to use. Each piece is made to last. Every size stays neat in the sturdy case.
You get grade 8.8 steel, zinc‑plated bolts, and a wide mix for many tasks.

This kit works well for home jobs and pro work. It keeps your projects safe and solid.

Pros	Cons
Tough steel for heavy duty jobs. Easy to find the right size. Strong parts that will not rust. Big set with many nuts and bolts. Work fast with this neat kit.	Case may feel a bit bulky for small jobs Many pieces can be overwhelming for new users No labels on each bolt size inside the case

Perfect For:

This kit is great for DIY fans, mechanics, and anyone who wants strong, ready-to-use nuts and bolts for quick fixes. It also works well for people who build or repair things at home and need reliable hardware on hand.

Ready to Purchase?

View Price on Amazon (paid link)

2. Taiss 3160PCS Metric Flange Bolt Assortment Kit,Nuts and Bolts Assortment Kit M2 M3 M4 M5 M6x1.0 M8x1.25 M10x1.5 Bolt(4-45mm)42 Sizes Hex Socket Button & Cap Head Metric Screw 10.9 Black Zinc Plated

Taiss 3160PCS Metric Flange Bolt Assortment Kit,Nuts and Bolts Assortment Kit M2 M3 M4 M5 M6x1.0 M8x1.25 M10x1.5 Bolt(4-45mm)42 Sizes Hex Socket Button & Cap Head Metric Screw 10.9 Black Zinc Plated

This kit holds 3160 bolts and nuts. It covers 42 sizes from M2 to M10.

Two boxes make it easy to carry. Flange bolts are made of strong 10.9 steel. Small bolts are zinc‑plated to resist rust.

Pros	Cons
Huge variety for many quick fixes Strong steel for tough jobs Neat boxes keep parts easy to find Rust-proof finish for long use Great value with many sizes in one kit	Large kit may feel hard to sort Many sizes can be more than some users need Heavy box due to high piece count

Perfect For:

This kit is perfect for anyone who loves simple, strong, and ready-to-use hardware. It suits builders, makers, and anyone who wants a full set of bolts on hand.

Ready to Purchase?

View Price on Amazon (paid link)

3. Kadrick Metric Screw Assortment, 2000PCS Metric Bolt Assortment Kit M2 M3 M4 M5 Machine Screws with Lock & Flat Washers, Grade 10.9 Alloy Steel Hex Socket Button Head Black Screws Nuts and Bolts Kit

Kadrick Metric Screw Assortment, 2000PCS Metric Bolt Assortment Kit M2 M3 M4 M5 Machine Screws with Lock & Flat Washers, Grade 10.9 Alloy Steel Hex Socket Button Head Black Screws Nuts and Bolts Kit

The Kadrick Metric Screw Assortment gives you 2000 tiny screws in one box. It is perfect for 3D printing, electronics repair and small DIY projects.

The kit covers M2, M3, M4 and M5 sizes. It includes screws, nuts, flat washers and lock washers. All parts are stored in a clear, labeled case with hex keys.

Made from 10.9 grade alloy steel, the screws are strong and precise. They come with a 24‑month warranty for peace of mind.

Pros	Cons
Great mix of small metric sizes Strong steel for long use Neat box keeps parts in place Clear labels make size pick fast Hand tools included for quick work	Not for heavy jobs or big builds Very small sizes may not fit all needs Lots of pieces can feel hard to sort

Perfect For:

This Kadrick Metric Screw Assortment is perfect for DIY enthusiasts, 3D printing hobbyists, and electronics repairers. It’s ideal for small, precise projects like robotics, RC models, and electronics, offering durable, organized, and easy-to-use screws, nuts, and washers.

Ready to Purchase?

View Price on Amazon (paid link)

4. 900PCS Metric Bolt Assortment, M6 M8 M10 M12 Grade 8.8 Bolts and Nuts Kit, Nut and Bolt Assortment, Nuts and Bolts, Metric Bolt Kit, Yellow Zinc Plated Coating, 18 Sizes

900PCS Metric Bolt Assortment, M6 M8 M10 M12 Grade 8.8 Bolts and Nuts Kit, Nut and Bolt Assortment, Nuts and Bolts, Metric Bolt Kit, Yellow Zinc Plated Coating, 18 Sizes

The 900PCS Metric Bolt Assortment gives you strong, reliable parts for many jobs. You get 18 sizes of bolts, nuts, and washers in one easy kit.

Each piece has a clear thread. Each bolt holds tight. Each part works well in many projects.

The Grade 8.8 alloy steel makes the bolts tough and long‑lasting. The yellow zinc coating helps protect them from rust. The sturdy case keeps everything neat and easy to find.

Pros	Cons
900 pieces, 18 sizes for all your project needs. High-quality alloy steel, rust-resistant, and durable. Easy storage with a sturdy, organized plastic case. Versatile use for DIY, repairs, and professional work.	Large kit may feel overwhelming for simple tasks Case compartments can shift if handled roughly Some sizes may be unused for many users

Perfect For:

This kit is perfect for handymen, DIY hobbyists, and small‑shop mechanics who need a fast, tidy way to grab the right bolt or nut. It also works great for electricians, plumbers, and garage owners who want reliable, rust‑proof fasteners on hand.

Ready to Purchase?

View Price on Amazon (paid link)

5. wugongshan 1080 Pcs Screws Bolts and Nuts Assortment Kit, Metric Machine Screws and Nuts and Flat Washers, M3/M4/M5/M6 Cross Slotted Round Head Bolts Sets (C)

wugongshan 1080 Pcs Screws Bolts and Nuts Assortment Kit, Metric Machine Screws and Nuts and Flat Washers, M3/M4/M5/M6 Cross Slotted Round Head Bolts Sets (C)

The wugongshan 1080 pcs kit gives you strong parts that last. The pieces have smooth edges. They stay clean and resist rust.

Each screw has a tight, clean thread. They fit well and do not slip. They are simple to use.

The set comes in a clear box with neat grids. You can find every size fast. It works for machines, furniture, tools, and many DIY jobs.

Pros	Cons
Strong metal build for long use Smooth threads make work easy Neat box keeps parts in order Many sizes for many jobs Great mix for daily fixes	Many pieces may feel overwhelming for new users Storage box grids can be tight for big fingers Some sizes may run out faster than others

Perfect For:

This kit is perfect for home repairs and builders. It is great for fixing a broken chair or working on DIY projects. The set includes many strong parts like bolts, nuts, and washers. The box keeps everything neat and easy to find. It works well on wood and metal. These tools are easy to use and help save time and money. Every handyman should have this useful set to keep their house in top shape.

Ready to Purchase?

View Price on Amazon (paid link)

6. Fgruh 2200PCS M2 M3 M4 M5 Metric Screws Assortment Kit, Hex Socket Button Head Assorted kit, Machine Screw Set with Nuts & Washers,10.9 Alloy Steel Black Zinc Plated for 3D Printing

Fgruh 2200PCS M2 M3 M4 M5 Metric Screws Assortment Kit, Hex Socket Button Head Assorted kit, Machine Screw Set with Nuts & Washers,10.9 Alloy Steel Black Zinc Plated for 3D Printing

Fgruh 2200PCS Metric Screw Assortment Kit is ready for any job. It has M2, M3, M4 and M5 sizes.

The screws are made from 10.9 alloy steel with black zinc plating. They are strong and rust‑proof. The threads are accurate to 0.01 mm.

The set comes in a sturdy plastic box. It is easy to carry in a tool bag. It is perfect for DIY and professional work.

Pros	Cons
Strong and long‑lasting steel build Smooth threads for tight, clean fits Neat box keeps all parts in place Many sizes for wide project use Reliable with a solid brand warranty	Limited to metric sizes, no imperial options. No color variety, only black zinc plating. Not ideal for heavy outdoor or marine use.

Perfect For:

This set is perfect for DIY fans, makers, and pros who need strong, well‑sorted hardware. It’s also great for anyone who wants reliable screws ready for any project.

Ready to Purchase?

View Price on Amazon (paid link)

7. Fgruh 1220PCS M3 M4 M5 M6 Metric Screws Assortment Kit,Hex Socket Head Cap Bolts Nuts and Washers Assorted Kit,304 Stainless Steel Hardware Set for DIY, 3D Printer

Fgruh 1220PCS M3 M4 M5 M6 Metric Screws Assortment Kit,Hex Socket Head Cap Bolts Nuts and Washers Assorted Kit,304 Stainless Steel Hardware Set for DIY, 3D Printer

The Fgruh 1220PCS Metric Screws Kit gives you strong, clean parts for fast, easy work. You get clear sizes, smooth threads, and a solid build. Every piece fits well.

This set works great for DIY, 3D printers, and small repairs. It keeps your projects simple. It helps you work fast.

The 304 stainless steel parts stay strong and resist rust. The box keeps everything neat and easy to find. It’s a handy kit that makes every job smoother.

Pros	Cons
1220 pieces cover all common metric sizes. 304 stainless steel resists rust and lasts forever. Clear, labeled case lets you find parts instantly. Perfect for 3D printing, electronics, and bike repairs. Heavy‑load capacity keeps projects secure and stable.	Many pieces may feel hard to sort Small parts can be easy to drop No tools included for quick use

Perfect For:

This set is perfect for DIY fans, 3D printer users, and anyone who needs strong, easy‑to-use hardware for quick fixes. It also suits people who want neat, ready-to-go parts for clean and simple work.

Ready to Purchase?

View Price on Amazon (paid link)

8. Kadrick 700Pcs Grade 8.8 Metric Bolt Assortment, M6 M8 M10 Flange Hex Heavy Duty Bolts and Nuts Kit,M6 x1.0 M8 x1.25 M10-1.25 (12mm to 45mm),Eco-Friendly Zinc Plated

Kadrick 700Pcs Grade 8.8 Metric Bolt Assortment, M6 M8 M10 Flange Hex Heavy Duty Bolts and Nuts Kit,M6 x1.0 M8 x1.25 M10-1.25 (12mm to 45mm),Eco-Friendly Zinc Plated

The Kadrick 700‑piece bolt kit gives you strong, clean, and easy‑to-use parts. Each piece is made from Grade 8.8 steel for tough, steady hold. The set stays neat in a labeled box for quick use.

The eco‑friendly coating helps stop rust. The brand offers long-term support for peace of mind.

Pros	Cons
Big 700‑piece set for many jobs Strong Grade 8.8 steel holds tight Eco‑safe coating fights rust Neat box keeps parts sorted Trusted brand with long support	Heavy: Over 8 pounds, may be bulky to carry. Limited to M6/M8/M10: No larger sizes available. Requires matching nuts: May not fit custom threads.

Perfect For:

This set is perfect for builders, DIY fans, and anyone who wants strong, ready-to-use bolts and nuts on hand. It also fits anyone who needs a reliable, heavy‑duty kit for quick fixes.

Ready to Purchase?

View Price on Amazon (paid link)

9. Metric Class 10.9 Hex Cap Screws Bolts, Nuts, & Washers Assortment Kit – 575 Pieces!

This 575‑piece kit gives you strong parts for tough jobs. Each piece is made with Class 10.9 steel. Every bolt, nut, and washer fits well.
You get M6, M8, M10, and M12 hex cap screws. You also get finished hex nuts. The flat and lock washers add extra hold.

The set comes in a heavy steel tray. It has 24 clear slots. It keeps all parts neat.

This kit is strong and easy to use. It is built to last.

Pros	Cons
Heavy duty steel for a strong and safe hold. This huge set has all the sizes you need. Hard grade metal will not break under a load. Keep your shop neat with this easy case. Fix it fast with tough bolts that last long.	Tray may feel bulky for small work areas Many sizes can be more than some users need Steel tray adds extra weight to carry

Perfect For:

This kit is perfect for mechanics, builders, and DIY users who need strong parts that fit many jobs. It is also great for anyone who wants a neat, easy-to-use set with bolts, nuts, and washers in one tray.

Ready to Purchase?

View Price on Amazon (paid link)

10. Bonost 3010pcs Hardware Assortment Kit with Assorted SAE & Metric Phillips Head Bolts, and Grade 8.8 Metric Hex Bolt Set with Matching Nuts and Lock Washers (4 Trays)

Bonost 3010pcs Hardware Assortment Kit with Assorted SAE & Metric Phillips Head Bolts, and Grade 8.8 Metric Hex Bolt Set with Matching Nuts and Lock Washers (4 Trays)

The Bonost 3010pcs Hardware Assortment Kit is your go-to for all SAE and metric fasteners. It includes Phillips head bolts, hex bolts, nuts, and washers in various sizes. Perfect for DIY projects and home repairs.

High-quality carbon steel ensures durability and rust resistance. Zinc coatings add extra protection for longer use. Sturdy trays keep everything organized and easy to find.

This kit fits hobbyists and homeowners alike. Small to large sizes cover most needs. 100% satisfaction service guarantees peace of mind.

Pros	Cons
Huge set with 3010 pieces Strong steel for long use Neat trays keep parts sorted Fits many home and hobby jobs Easy to carry and store	Large case may be bulky for small toolboxes No metric torque specs included with the bolts Zinc coating can wear off with heavy use

Perfect For:

This kit is perfect for anyone who needs to fix things around the house. It is great for DIY fans, makers, and new homeowners. The neat case keeps all the bolts and nuts in order. Use it for small repairs or big projects. It is a simple, handy set for all your needs.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

You want a kit that feels right in your hands. You want parts that fit clean and tight. You want work that feels smooth from start to finish.

A good metric bolt kit makes every task easier. It keeps you ready for quick fixes and big jobs. It gives you a calm, steady feeling because every piece fits the way it should.

Strength: Pick bolts made from Grade 8.8, 10.9, or 304 stainless steel. These grades stay strong under pressure. They hold tight and last a long time.
Rust Protection: Look for zinc‑plated or stainless steel parts. These coatings stop rust. They keep your bolts clean and smooth.
Size Range: Choose kits with many sizes like M2 to M12. More sizes mean more uses. You stay ready for any task.
Thread Quality: Clean, sharp threads make work easy. They turn smooth. They grip well without slipping.
Washer and Nut Mix: A good kit includes nuts, flat washers, and lock washers. These parts add hold. They keep your work tight and safe.
Case Quality: A strong box with clear labels saves time. It keeps parts neat. It helps you find the right size fast.
Use Case: Pick small‑size kits for electronics and 3D printing. Pick heavy‑duty kits for machines, tools, and home repairs. Match the kit to your work.
Piece Count: Bigger kits give more value. They keep you stocked. You won’t run out in the middle of a job.
Finish: Look for smooth edges and clean surfaces. Good finishes make bolts easy to handle. They also help them last longer.
Brand Support: Some brands offer warranty or long‑term help. This gives peace of mind. It shows the maker trusts their own parts.