4071 Nuts and Bolts Assortment Kit 4MM-30MM - Large Metric Fastener

In this review of the 4071 Nuts And Bolts Assortment Kit, the bottom line is clear: this kit is aimed at hobbyists, makers and tradespeople who need a large, organized selection of metric fasteners for ongoing projects. The single biggest reason to buy is the sheer quantity and range - 4071 pieces including matched screws, nuts and washers in 39 sizes - which turns frequent trips to the hardware store into a thing of the past and keeps repair and build work moving without searching for parts.

Key Features

• Massive quantity: 4071 total pieces provide long-term supply for multiple projects so you rarely run out of common sizes.
• Complete matched sets: The kit includes screws, nuts, flat washers and lock washers in coordinated counts so fastener combinations are ready for assembly work.
• Wide size range: 39 sizes from 4mm to 30mm cover typical needs for 3D printers, electronics and household repairs, reducing substitutions or compromises.
• Durable material finishes: Upgraded zinc electroplated and black oxidized production gives extended rust prevention and cleaner appearance without extra oiling.
• Grade alloy steel: Screws made from higher grade alloy steel (10.9/12.9 mentioned) improve strength and durability for mechanical applications.
• Portable organizer case: A reusable storage box with upgraded lock buckles keeps the assortment tidy and easy to carry to job sites.

Who It's For

This kit suits 3D printing enthusiasts, electricians doing small installations, DIYers restoring appliances and any hobbyist who builds or repairs hardware frequently and wants a comprehensive metric assortment on hand. The large counts and mixed finishes make it useful where many identical fasteners are needed across projects.

It is less ideal for someone who only needs a few specialty fasteners or prefers imperial sizes, since the kit focuses on metric M2 to M5 ranges and prioritizes volume over rare specialty parts. Also, professionals who require traceable certified fasteners for regulated applications should look elsewhere.

Pros & Cons

Pros

• Extremely large inventory of screws, nuts and washers reduces repeat purchases and keeps work uninterrupted.
• Well organized in a portable box with secure lock buckles for easy transport and reuse.
• Upgraded zinc plating and black oxidized options give improved corrosion resistance and a cleaner look.

Cons

• Volume-focused kit may contain more common sizes than a user needs, making it less economical for single-use buyers.

Specifications

Total pieces	4071 pcs
Screws included	940 pcs (various sizes)
Nuts included	940 pcs
Washers included	1090 flat + 1090 lock washers
Size range	39 sizes, 4mm to 30mm
Material/grade	Alloy steel, 10.9/12.9 grade (zinc plated / black oxidized)
Accessories	5 L wrenches, 5 50mm hex bits, 1 tweezer, storage case

Our Verdict

The 4071 Nuts And Bolts Assortment Kit is excellent value for makers and small tradespeople who need a ready stock of metric fasteners. Its enormous quantity, matched components and durable finishes make it a practical time saver for repair and build work, while the portable organizer keeps parts accessible. If you need long-term supply of common metric sizes, this kit delivers solid utility and convenience.

Frequently Asked Questions

Does the kit include washers and lock washers?
Yes. The set contains 1090 flat washers and 1090 lock washers alongside the screws and nuts.

Are the fasteners corrosion resistant?
The screws come in upgraded zinc electroplated and black oxidized finishes for extended rust prevention without additional oiling.

Is the set portable for job site use?
Yes. Fasteners are stored in a reusable portable organizer box with upgraded lock buckles for secure transport.