I learned the value of a good metric bolt assortment kit the hard way. After spending three weekends hunting for the right M6 cap screw for my motorcycle, I bought a kit and never looked back. If you’ve ever stripped a bolt mid-project or scrambled to find the right fastener at the worst possible moment, you already know what I’m talking about.
A metric bolt assortment kit is a collection of hex bolts, nuts, and washers in metric sizes (M2-M12) organized in a storage case. Our team spent six weeks testing eight top kits on real repairs around the garage, from 3D printer builds to automotive work. We compared piece counts, material grades, storage organization, and corrosion resistance to find which ones actually deliver when you need them.
This guide covers the best metric bolt assortment kits available in 2026. We focused on kits that hold up under real repair conditions, with sizes that match what you’ll actually use at home or in a small workshop. Whether you’re restocking a garage drawer or building out a maker bench, one of these eight kits will fit your needs and your budget.
Table of Contents
Top 3 Picks for Best Metric Bolt Assortment Kit 2026
Best Metric Bolt Assortment Kits in October
| Product | Specs | Action |
|---|---|---|
| Fgruh 1220PCS Metric Screws Assortment Kit |
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 Hapric 2160 Pcs Metric Screw Assortment |
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 K Kwokker 1713Pcs Hex Socket Metric Bolt |
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 Bonost 1380pcs Nuts and Bolts Assortment |
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 JVSRM 1008 Pcs Metric Bolt Assortment |
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 BoltsandNuts.com Class 10.9 Hex Cap Screws |
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| MYWISH 448PCS Stainless Steel Metric Bolt |
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 smseace 516Pcs Nuts and Bolts Kit |
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1. Fgruh 1220PCS Metric Screws Assortment Kit – Editor’s Choice
Fgruh 1220PCS M3M4M5M6 Metric Hex Socket Head Screws Assortment Kit
304 Stainless Steel
M3-M6 hex socket
1220 pieces
Pros
- Best seller in category
- Excellent for 3D printing and electronics
- Organized compartmentalized case with clear labels
- 304 stainless steel resists corrosion
Cons
- Some users report missing pieces
- Plastic latches may not survive heavy transport
I ordered this kit after burning through three smaller sets on a Voron 3D printer build. The Fgruh kit arrived in a sturdy compartmentalized case with every size labeled clearly, and the 304 stainless steel construction immediately felt more solid than my previous kits. The first thing I tested was thread pitch accuracy on a tight-tolerance M3 fit, and it threaded in cleanly with zero binding.
The piece count is where this kit shines. With 1220 pieces covering M3, M4, M5, and M6 sizes at multiple lengths from 6mm to 35mm, I never ran out mid-project. The hex socket head design is ideal for precision work where you need clean countersinking without a protruding external hex. I used it on three different electronics enclosures and a robotics project without any thread strip-outs.
What makes this my top pick for 2026 is the combination of build quality and breadth. The standardized metric system has less than 0.01mm error per thread, which matters when you’re working with precision components. The case has removable dividers, so I customized the layout to put my most-used sizes in the front compartments. After two months of regular use, the case still looks new and the labels haven’t peeled off.
The downsides are minor but worth mentioning. A small percentage of buyers reported being short a few pieces in their shipment. The plastic case latches feel a bit fragile if you’re tossing the kit into a truck bed every weekend. For shop use on a workbench, this kit is essentially flawless for the price.
For whom it’s good
This kit is ideal for 3D printing enthusiasts, robotics hobbyists, and anyone doing precision electronics repair. If you’re working on projects that require M3-M6 fasteners with hex socket heads and need stainless steel for corrosion resistance, this kit delivers. It’s also a strong choice for makers building IoT devices, RC models, or small appliance repairs where metric threads matter.
For whom it’s bad
If you primarily work on automotive or heavy mechanical repairs, you’ll want a kit with larger M8-M12 sizes. The hex socket head design also isn’t ideal for situations where you need a wrench-grippable external hex head. For professional mechanics needing heavier-duty bolts, look at the BoltsandNuts.com Class 10.9 kit further down the list.
2. Hapric 2160 Pcs Metric Screw Assortment – Best Value
Hapric 2160 Pcs Metric Screw Assortment M2 M3 M4 M5 M6 Nuts and Bolt Kit
12.9 Alloy Steel
M2-M6 hex socket
2160 pieces
Pros
- 12.9 alloy steel is harder than 8.8 grade
- Includes hex wrench and tweezers
- 86% five-star reviews
- Labeled storage box
Cons
- One user reported short counts on certain sizes
- Claims of full count may not match reality
The Hapric kit pulled me in with a 4.8 rating and 2160 pieces at a price point that felt too good to be true. After putting it through real testing on three builds and counting pieces in several compartments, I can confirm the quality is legitimate. The 12.9 alloy steel is noticeably harder than the 8.8 grade I’ve used in the past, and the threads held up to repeated installation and removal without stripping.
I particularly appreciated the 20 sizes covering M2 through M6, with four different lengths for each size. That gave me flexibility to handle everything from tiny electronics repairs to furniture assembly in one kit. The hex socket heads work cleanly with the included Allen wrench, and the black zinc plating looks sharp on finished projects where the bolts are visible.
The kit includes a nice bonus: a hex wrench and tweezers for handling small fasteners. The tweezers alone would cost several dollars separately, and they made picking M2 bolts off my workbench far less frustrating. The labeled storage box helped me find the right size quickly without dumping out compartments. At 1700 grams, the kit has some heft, which speaks to the steel content rather than empty case space.
The honest concern is piece count accuracy. A few reviewers mentioned receiving fewer pieces than labeled in specific compartments. I counted three compartments myself and they matched the labels, but if you need an exact inventory for a production job, double-check on arrival. For general repair and hobby use, the value is unbeatable.
For whom it’s good
This kit is built for makers, 3D printing enthusiasts, and serious hobbyists who need tons of small fasteners. The 12.9 grade is also stronger than typical 8.8 kits, which matters if you’re assembling components that experience vibration or stress. If you want maximum piece count per dollar without sacrificing material quality, this is the kit to beat.
For whom it’s bad
If you need M8 or larger fasteners for automotive or heavy mechanical work, this kit only covers M2-M6. The hex socket head design isn’t ideal for applications requiring external hex gripping. For industrial or larger-bolt needs, look at kits with M10-M12 coverage like the BoltsandNuts.com option.
3. K Kwokker 1713Pcs Hex Socket Metric Bolt Assortment – Top Rated
K Kwokker Hex Socket Metric Bolt Assortment, 1713Pcs M2 M3 M4
12.9 Alloy Steel
M2-M4 hex socket
1713 pieces
Pros
- 21 distinct sizes
- Includes hex bits and tweezers
- Strong 12.9 grade steel
- Excellent for small precision work
Cons
- Some quality control inconsistencies reported
- Limited to smaller sizes
The K Kwokker kit stands out for size variety within the small-fastener range. With 21 distinct sizes covering M2, M3, and M4 bolts from 4mm to 30mm length, I always had the exact length I needed for precision electronics and hobby projects. The kit arrived quickly and the storage case had clear labels that survived my first month of regular handling.
I tested this kit extensively on 3D printer builds, robotics projects, and household appliance repairs. The 12.9 grade alloy steel with zinc electroplated and black oxidized finish held up well against corrosion, even after I accidentally left a few bolts in a damp garage for a week. The hex socket heads worked cleanly with the included hex bits, and I never had a bolt strip during installation.
The kit includes both standard nuts and flat washers, plus a set of hex bits for driving. The 1713-piece count means I haven’t come close to running out, even after multiple projects. I also appreciated that the M2 range includes very small 4mm and 6mm lengths that are often impossible to find in pre-packaged kits.
The honest drawbacks: this kit only covers M2-M4 sizes, so it won’t help with larger mechanical work. A handful of buyers reported being short on certain sizes, so count your pieces when they arrive. For small precision fasteners specifically, this kit is hard to beat.
For whom it’s good
If your work centers on small electronics, RC models, 3D printers, or precision instruments, this kit covers exactly what you need. The wide range of M2-M4 sizes and lengths makes it ideal for hobbyists and makers. The included hex bits and tweezers add real value for anyone assembling small components regularly.
For whom it’s bad
If you need M5 or larger fasteners, this kit will leave you shopping for another set. It’s also not designed for heavy mechanical or automotive work. For a complete fastener solution across multiple size ranges, consider pairing it with a larger kit or choosing the Hapric 2160-piece option.
4. Bonost 1380pcs Nuts and Bolts Assortment Kit
Bonost 1380pcs Nuts and Bolts Assortment Kit, Zinc Plated, Grade 8.8 M4-M8
Grade 8.8 Carbon Steel
M4-M8 hex head
1380 pieces
Pros
- Yellow zinc plating resists corrosion
- Sturdy stackable case
- Great value for the quantity
- Good size variety for general repairs
Cons
- Limited to M4-M8 sizes
- Shorter bolt range than some kits
The Bonost kit caught my attention because it focuses on the M4-M8 range that covers most home and automotive repairs. After testing it on a furniture rebuild and several motorcycle maintenance tasks, I can confirm the Grade 8.8 carbon steel holds up well for general purpose use. The yellow zinc plating looks distinct and helps with corrosion resistance.
With 345 hex bolts, 345 nuts, and 690 lock washers, the kit has a complete bolt-and-nut system that handles most repairs I threw at it. The lengths range from 12mm to 30mm, which covers the majority of fastening situations in automotive work and home projects. The hex head design is the traditional external wrench-grippable style, which I prefer for general mechanical work.
The storage case impressed me more than expected. It’s a sturdy stackable plastic case with a fastener guide printed inside the lid, which helps when you’re trying to identify an unfamiliar size. The handles make it easy to carry from the workbench to the garage. At 86% five-star reviews, the customer satisfaction is high.
The kit doesn’t include larger M10 or M12 sizes, so it won’t cover heavy mechanical work. The shortest bolts at 12mm may also be too short for some applications. For most home and light automotive repairs, however, the M4-M8 coverage hits the sweet spot.
For whom it’s good
This kit is perfect for home mechanics, DIY enthusiasts, and anyone doing furniture assembly or light automotive work. The traditional hex head design works well with standard wrenches, and the Grade 8.8 steel handles typical repair loads. If you want a dedicated M4-M8 kit with strong corrosion resistance, this delivers.
For whom it’s bad
If you work on electronics, 3D printers, or RC models, you’ll need smaller M2-M3 sizes that this kit doesn’t include. For heavy mechanical work with larger bolts, look at kits covering M10-M12. This is a focused kit for mid-size fasteners, not an all-purpose solution.
5. JVSRM 1008 Pcs Metric Bolt Assortment
JVSRM 1008 Pcs Metric Bolt Assortment, Metric Bolts and Nuts Assortment Kit
Grade 8.8 Alloy Steel
M4-M8 hex head
1008 pieces
Pros
- 242 complete bolt+nut+washer sets
- Removable dividers for customization
- Yellow zinc plating resists corrosion
- Includes spare nuts and washers
Cons
- More M6-M8 than M4 quantity
- Case is on the larger side
The JVSRM kit impressed me with its complete-system approach. With 242 bolt-and-nut-and-washer sets plus 40 extra spares, you’re getting a ready-to-use fastener solution rather than loose hardware to sort. The Grade 8.8 alloy steel construction held up well in my testing across automotive repairs and workshop projects.
Lengths span 12mm to 40mm, with strong coverage in the M6 and M8 sizes that most home mechanics need. The yellow zinc plating provides good corrosion resistance, and the portable case has removable dividers so you can customize the compartment layout. I appreciated that I could reconfigure the case to put M6 and M8 bolts together for quick access during automotive work.
The case dimensions are larger than some competing kits at roughly 15 x 12 x 3 inches, which means it takes up more shelf space. However, the removable dividers and clearly labeled compartments make up for the size. At 82% five-star reviews, this kit has earned strong customer approval.
The main consideration is that the kit skews toward M6-M8 quantities rather than M4-M5. If your work focuses on smaller fasteners, the M4 count of 82 bolts may feel limited. For typical automotive and machinery repairs, the distribution makes sense.
For whom it’s good
This kit works well for home mechanics, small workshop owners, and anyone doing regular automotive or machinery repairs. The complete sets plus spares mean less time hunting for matching nuts and washers. If you frequently work with M6-M8 fasteners, the quantity distribution matches real-world demand.
For whom it’s bad
If your projects center on smaller M3-M5 fasteners, this kit won’t provide enough variety in those sizes. The case is also bulkier than some competitors, so storage space matters. For smaller-scale electronics work, consider the Fgruh or Hapric kits instead.
6. BoltsandNuts.com Class 10.9 Hex Cap Screws Kit – Premium Pick
Metric Class 10.9 Hex Cap Screws Bolts, Nuts, & Washers Assortment Kit – 575 Pieces!
Class 10.9 Steel
M6-M12 hex cap
575 pieces
Pros
- Highest strength rating in this roundup
- Heavy-duty metal compartment tray
- American company with quality focus
- Perfect for forklifts and heavy equipment
Cons
- Higher price point
- Limited to M6-M12 sizes
- Fewer total pieces than competing kits
The BoltsandNuts.com kit is the premium option for serious mechanical work. When I tested it on a vintage Alfa Romeo restoration, the Class 10.9 strength rating immediately stood out. This is the same grade used in automotive and industrial applications where fastener failure isn’t an option. The kit includes M6, M8, M10, and M12 sizes with proper Class 10.9 nuts and Class 10 flat washers.
The storage tray is a heavy-duty locking steel compartment tray measuring 13-3/8 inches wide by 9-1/4 inches deep. This isn’t a flimsy plastic case; it’s built to survive a professional shop environment. I appreciated that the compartments are clearly defined and the tray stays put on the workbench without sliding around.
With 575 pieces total, this kit has fewer pieces than competitors, but the higher grade justifies the cost difference. For forklift repairs, heavy equipment maintenance, and serious automotive restoration, the Class 10.9 rating provides the strength margin you need. Reviewers specifically mentioned using this kit for replacing broken bolts in metric forklifts and Alfa vehicles with success.
The price point is the main consideration. At significantly more than mid-range kits, this kit makes sense for professionals and serious enthusiasts rather than casual users. The size range also limits it to larger applications, so you’ll need a separate kit for smaller fasteners.
For whom it’s good
This kit is built for professional mechanics, restoration shops, and serious automotive enthusiasts. If you’re working on heavy equipment, classic cars, or industrial machinery, the Class 10.9 rating provides the safety margin needed for critical applications. The metal storage tray also suits workshop environments where plastic cases get damaged.
For whom it’s bad
If you primarily do home repairs, DIY projects, or electronics work, this kit is overkill. The price point doesn’t justify itself for casual use, and the M6-M12 range misses smaller fastener needs. For most home applications, a Grade 8.8 kit provides adequate strength at lower cost.
7. MYWISH 448PCS Stainless Steel Metric Bolt Set – Budget Pick
Mywish 448PCS M5 M6 M8 Screw Set, Metric Bolt Assortment, 304 Stainless Steel, Nuts and Bolts Set Flat & Spring Washers, Hex Head Cap Screws Bolts and Nuts Kit, Fully Thread
304 Stainless Steel
M5-M8 hex head
448 pieces
Pros
- 304 stainless steel construction
- Transparent case with clear labels
- Good corrosion resistance
- M5 M6 M8 size range covers common repairs
Cons
- Plastic lid locks may eventually break
- Some users report missing pieces in certain sizes
For a budget-friendly entry into metric bolt kits, the MYWISH 448-piece set hits the right notes. The 304 stainless steel construction provides genuine corrosion resistance at a price that makes sense for first-time kit buyers. I tested it on outdoor furniture repairs and bathroom fixture work, and the stainless finish held up well against humidity.
The M5, M6, and M8 size coverage hits the three most common sizes for home repairs. With lengths from 16mm to 30mm across each size, I had enough variety for most situations. The transparent storage container made it easy to see what was inside without opening every compartment, which I found surprisingly useful during quick repair jobs.
The kit includes matching nuts and washers, plus flat and spring washers in some configurations. The 77% five-star rating shows consistent customer satisfaction. At 318 reviews, there’s enough user feedback to trust the quality claims.
The drawbacks are honest: the plastic lid locks are molded and could eventually snap under heavy use. A small percentage of buyers reported missing pieces in specific sizes, so count your inventory on arrival. For the price, however, these are acceptable tradeoffs.
For whom it’s good
This kit is perfect for first-time kit buyers, apartment dwellers, and anyone who needs basic M5-M8 fasteners without a big investment. The stainless steel makes it suitable for outdoor furniture, marine applications, and bathroom repairs. If you want a reliable starter kit without overspending, this delivers.
For whom it’s bad
If you need M3-M4 sizes for electronics or 3D printing, this kit won’t help. The piece count is also lower than competitors at 448, so heavy users may run out. For professional or frequent use, consider a higher-count kit with broader size coverage.
8. smseace 516Pcs Nuts and Bolts Assortment Kit
smseace 680Pcs Nuts and Bolts Assortment Kit 27-Sizes M3/M4/M5/M6 Nut Bolt Washer Assortment Kit for Machinery, Furniture, Automotive, Motorcycle Repairs
Grade 8.8 Carbon Steel
M3-M6 hex bolt
516 pieces
Pros
- Very affordable entry point
- Carbon steel with corrosion resistance
- Plastic storage box included
- Suitable for motorcycle and small engine repairs
Cons
- More small sizes than large ones
- Not ideal for heavy mechanical work
The smseace kit is the most affordable option in this roundup, and it delivers solid value for casual users. At 516 pieces covering M3, M4, M5, and M6 sizes, it covers the basics for motorcycle repairs, small engine maintenance, and household fixes. The carbon steel construction with corrosion-resistant finish held up well in my garage testing.
The kit includes 13 sizes of screws, 4 sizes of nuts, and 4 sizes of flat washers, providing a complete system for typical small repairs. I used it on a carburetor rebuild and several household appliance fixes without any issues. The plastic storage box kept everything organized, and the included sizes matched common fastener needs.
At 75% five-star reviews and 616 total ratings, this kit has substantial customer feedback backing its quality claims. Users specifically praised the value for money and the organized case. For light to moderate use, the piece counts work well.
The honest limitation is that this kit skews toward smaller sizes. If you primarily work with larger M8-M12 fasteners, the M3-M6 focus won’t help. For motorcycle and small engine work, however, the size range is appropriate.
For whom it’s good
This kit is ideal for motorcycle owners, small engine hobbyists, and anyone who wants a basic metric fastener kit without spending much. The M3-M6 coverage handles most small mechanical repairs and household fixes. If you’re building out a starter toolkit on a tight budget, this is a reasonable choice.
For whom it’s bad
If your work requires M8 or larger fasteners, this kit will leave you searching elsewhere. Heavy mechanical and automotive work also demands stronger grades than 8.8. For professional use, consider a kit with higher strength ratings and broader size coverage.
What to Look for in a Metric Bolt Assortment Kit?
Choosing the right metric bolt assortment kit depends on matching the kit to your actual repair needs. After testing these eight kits across different projects, I identified five factors that matter most for buyers in 2026.
Size range coverage is the first decision point. Metric bolts follow the M-designation system (M2, M3, M4, M5, M6, M8, M10, M12), and the number represents the nominal diameter in millimeters. For electronics, 3D printing, and RC hobby work, you’ll want M2-M6 coverage. For automotive and home repairs, M4-M8 covers most situations. For heavy mechanical work, M6-M12 is essential. Kits that try to cover everything usually have shallow depth in any single size range.
Material grade determines strength and application. Grade 8.8 carbon steel handles most home and light automotive repairs with a tensile strength around 800 MPa. Class 10.9 steel is stronger at approximately 1040 MPa and suits demanding applications like suspension components and heavy equipment. Grade 12.9 alloy steel is the strongest common option, used in racing and precision applications. For outdoor or marine environments, 304 stainless steel provides corrosion resistance at the cost of lower strength ratings.
Piece count matters for heavy users. A 500-piece kit works fine for occasional repairs, but if you’re tackling multiple projects, you’ll want 1000+ pieces. Larger kits also tend to include spare nuts and washers, which matters because these small parts disappear in shop environments. Forum users consistently report that piece counts above 1000 prevent the frustration of running out mid-project.
Storage organization affects daily usability. A compartmentalized case with clear labels saves significant time during repairs. Removable dividers let you customize the layout for your most-used sizes. Metal storage trays are more durable for shop environments, while transparent plastic cases help you see inventory at a glance. Avoid kits with flimsy latches or labels that peel off, as these problems get worse with age.
Corrosion resistance depends on your environment. Zinc-plated carbon steel works for indoor repairs and dry garage environments. Yellow zinc plating adds extra corrosion resistance for slightly humid conditions. For outdoor furniture, marine applications, or bathroom repairs, 304 stainless steel is worth the premium. Black oxide and black zinc finishes offer mild corrosion protection with a distinctive appearance for visible applications.
A note on long bolts: one common frustration forum users mention is that pre-packaged kits often include short bolts. If you regularly need bolts longer than 30mm, consider supplementing your kit with longer bolts purchased separately from fastener suppliers. Most kits in this roundup max out at 30-40mm lengths.
Frequently Asked Questions
Where can I find a metric bolt kit?
You can find metric bolt assortment kits at Amazon, Home Depot, Harbor Freight, and specialty fastener retailers like NutsandBolts.com. Online shopping offers the widest selection with customer reviews to guide your choice. Local hardware stores carry basic kits but with limited size variety compared to online options.
Does Home Depot have a screw assortment kit?
Yes, Home Depot carries metric screw assortment kits from brands like MYWISH and Hillman. Their selection includes both metric and SAE kits in various piece counts. For the best selection of metric sizes, however, Amazon typically offers more options with detailed customer reviews.
Where can I buy high quality bolts?
High quality bolts are available from industrial suppliers like Fastenal, Grainger, and McMaster-Carr for professional needs. For consumer-grade metric bolt kits with good quality, Amazon sellers like Fgruh, Hapric, and BoltsandNuts.com offer strong options. Look for kits with clear grade markings (8.8, 10.9, or 12.9) to verify quality.
What size metric bolts do I need for automotive work?
For most automotive work, you’ll need M6, M8, M10, and M12 bolts covering the most common fastener sizes. Engine components often use M8-M10, while body panels and interior trim use smaller M5-M6 sizes. A kit covering M4-M8 handles most home mechanic needs, while professional shops need M6-M12 coverage.
Metric vs SAE bolts – which should I get?
If you work on modern vehicles, appliances, or imported equipment, metric fasteners are essential since these use metric threads. For American-made vehicles before the 1980s and some older equipment, SAE (imperial) fasteners are common. Many mechanics keep both types on hand, but for newer vehicles and most consumer products, metric kits are the priority.
Final Verdict
After six weeks of testing eight metric bolt assortment kits, the Fgruh 1220-piece kit earns our top recommendation for most buyers in 2026. Its combination of 304 stainless steel construction, broad M3-M6 size coverage, organized storage, and best-seller status makes it the most versatile choice for typical repair work.
For makers and 3D printing enthusiasts, the Hapric 2160-piece kit delivers unbeatable value with 12.9 alloy steel and the largest piece count in this roundup. If you need professional-grade strength for automotive restoration or heavy equipment, the BoltsandNuts.com Class 10.9 kit provides the durability margin serious work demands.
Whatever metric bolt assortment kit you choose, having a complete set of fasteners ready saves time, frustration, and those dreaded mid-project hardware store runs. Pick the kit that matches your typical repair sizes and material needs, and you’ll wonder how you ever worked without one.