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

Our review of this 4071 piece metric fastener kit finds it best for hobbyists, makers and technicians who need a comprehensive, ready-organized supply of machine screws and matching hardware. The single biggest reason to buy is the sheer variety and quantity: 940 screws, 940 nuts and over 2,000 washers and lock washers in a portable organizer mean fewer trips to the hardware store and faster project turnaround. The set is presented as a long-term workbench staple thanks to upgraded zinc electroplating and a sturdy storage case with improved lock buckles.

Key Features

• 4071 piece total: A massive assortment provides 940 screws, 940 nuts, 1090 flat washers and 1090 lock washers to cover many repair and build tasks without running short.
• Wide size range: 39 full sizes from 4mm to 30mm let you match fasteners to projects from small electronics to light mechanical assemblies.
• Durable finish options: Upgraded zinc electroplated and black oxidized processes extend rust resistance so parts stay usable longer without extra oiling.
• Quality alloy steel: Screws are made from high grade 10.9/12.9 alloy steel for strength and repeatable performance in machine applications.
• Organized portable case: Parts arrive in a reusable storage box with labeled bags, a stronger lock buckle and a compact footprint for moving between work sites.
• Accessory tools included: The kit includes five L wrenches, five 50mm hex Allen drill bits and a tweezer so you can start working immediately.

Who It's For

This kit is ideal for 3D printer owners, electronics hobbyists, electricians doing light panel work and general DIYers who want an extensive, well organized selection of metric fasteners on hand. The quantity and size spread suits small production runs, frequent repairs and makers who assemble varied projects.

It is less appropriate for heavy structural or automotive applications that require larger grade bolts or specialized coatings, and users needing imperial sizes should look elsewhere; this pack is strictly metric and focused on M2 to M5 families and longer 4mm to 30mm lengths.

Pros & Cons

Pros

• Exceptional quantity and size variety reduces emergency part shortages.
• Sturdy alloy steel construction and upgraded plating improve longevity for workshop use.
• Clear organization in labeled bags and a lockable portable case makes storage and transport simple.
• Includes useful accessories so you can begin assembling immediately.

Cons

• The kit focuses on small metric sizes and is not suitable for heavy structural fasteners or imperial projects.
• Large total piece count can be overwhelming to sort if not using the provided organizer carefully.

Specifications

Total pieces	4071 pcs
Screws included	940 pcs (metric M2, M3, M4, M5 sizes)
Nuts included	940 pcs
Washers included	1090 flat washers and 1090 lock washers
Size range	39 sizes, 4mm to 30mm lengths
Material and grade	Alloy steel, 10.9/12.9 grade
Accessories	5 L wrenches, 5 50mm hex Allen drill bits, 1 tweezer, storage case

Our Verdict

This 4071 piece metric nut and bolt assortment is a practical value for makers, technicians and DIYers who want a well organized, durable supply of small machine screws and matching hardware. The large counts, complete size range and improved plating make it a workbench staple for frequent repairs and projects, provided you need metric sizes rather than heavy structural bolts.

Frequently Asked Questions

Are imperial sizes included?
No, the set is strictly metric with M2 to M5 families and lengths from 4mm to 30mm.

Do the screws resist rust?
The kit uses upgraded zinc electroplating and a black oxidized option intended to extend corrosion resistance without extra oiling.

Is the storage case portable and durable?
Yes, parts come in a reusable portable organizer with upgraded lock buckles for secure transport.