Metric Bolt Assortment 434PCS M5 M6 M8 M10 M12 Socket Head Kit

In this review the 434PCS Metric Bolt Assortment is evaluated as a practical workshop kit for hobbyists, small repair jobs, and light industrial maintenance. The bottom line: the set's strongest selling point is its breadth of sizes and the included storage box, which together make finding and organizing metric socket head bolts and matching nuts and washers straightforward. For anyone who regularly works on machinery, appliances, or DIY projects, this kit cuts trips to the hardware store and keeps compatible fasteners on hand.

Key Features

• Wide size range: Includes M5, M6, M8, M10 and M12 screws in multiple lengths, covering most common small-to-medium fastener needs.
• Complete matching hardware: Each screw size comes with corresponding nuts and flat washers to improve load distribution and prevent damage to parts during installation.
• High strength material: Made from 12.9 grade alloy steel with a black oxide finish for increased tensile strength and basic corrosion resistance.
• Organized storage: All pieces are packed in a sturdy box that helps prevent loss and keeps selections visible and accessible.
• Hex tools included: A set of five hexagon wrenches is provided so you can start using the kit immediately on socket head cap screws.

Who It's For

The kit suits hobby mechanics, home repairers, and small workshop owners who need a variety of metric bolts and nuts without buying individual lengths. Its mix of M5 through M12 parts and multiple lengths makes it especially good for assembling machinery, electronics enclosures, and household repairs.

It is not geared toward heavy structural construction or high-corrosion outdoor applications where stainless fasteners or specialized coatings are required. Buyers needing uncommon thread pitches or a larger quantity of a single size should look for bulk or specialized packs instead.

Pros & Cons

Pros

• Comprehensive selection of sizes and lengths reduces the need to source separate parts for routine jobs.
• Matching nuts and washers for each size simplify proper assembly and increase joint reliability.
• 12.9 grade alloy steel offers high tensile strength for demanding small machinery use.
• Sturdy storage box and included hex wrenches make the kit ready to use and easy to organize.

Cons

• Black oxide finish offers limited corrosion resistance compared with stainless steel, so it's not ideal for prolonged outdoor exposure.
• Low counts for larger sizes (M10, M12) mean the kit favors variety over large-volume replacement of big fasteners.

Specifications

Quantity	434 pieces total
Screw sizes	M5, M6, M8, M10, M12
Length options	12mm, 16mm, 20mm, 30mm, 40mm, 50mm, 60mm, 80mm, 100mm
Included hardware	Screws, matching nuts, flat washers, 5 hex wrenches
Material and grade	Alloy steel, 12.9 grade
Finish	Black oxide
Tensile strength	Approx. 1220 N/mm2

Our Verdict

The 434PCS Metric Bolt Assortment is a solid, cost-effective option for anyone who needs a varied inventory of socket head machine screws and matching hardware kept in a practical storage box. Its high-strength 12.9 alloy steel and included washers and hex wrenches make it a dependable kit for workshop maintenance and DIY projects, though those needing superior corrosion resistance or large volumes of a single large size should consider alternatives.

Frequently Asked Questions

Does the kit include matching nuts and washers for each screw?
Yes, each screw size in the kit includes corresponding nuts and flat washers to ensure proper assembly and load distribution.

What is the material and strength grade of the bolts?
The fasteners are alloy steel with a 12.9 grade rating and a black oxide finish, providing high tensile strength for demanding small machinery uses.

Is this kit suitable for outdoor or marine use?
The black oxide finish gives limited rust resistance; for prolonged outdoor or marine exposure, stainless steel fasteners are a better choice.