340PCS Threaded Inserts Nuts Assortment Kit - Durable Steel Inserts

In this review the 340PCS Threaded Inserts Nuts assortment kit is evaluated for furniture repair and DIY work; it is best for carpenters and hobbyists who need a wide range of threaded inserts in one organized kit. The single biggest reason to buy is the combination of quantity and size variety, which covers common 1/4 in-20, 5/16 in-18 and 3/8 in-16 needs and reduces trips to the hardware store. The review finds the kit practical, well organized, and straightforward to install for most soft wood projects.

Key Features

• Wide size range: Ten sizes provide comprehensive coverage for common furniture fasteners, saving time when matching inserts to bolts and screws.
• Large quantity: With 340 pieces included, the kit supplies enough inserts for multiple projects or repairs without repeated purchases.
• Carbon steel construction: Zinc plated carbon steel gives good corrosion resistance and wear resistance for longer lasting joints.
• Easy installation: Standard internal hex socket design and supplied hex wrench make insertion quick when holes are drilled to the recommended size.
• Organized case: A reinforced plastic case with thick dividers and clear labels keeps all sizes sorted and easy to find on the job.

Who It's For

This kit is well suited to professional carpenters, furniture restorers, and serious DIYers who frequently work with pine, plywood, MDF or other soft woods and need a ready supply of threaded inserts in multiple depths and diameters. The assortment is also handy for workshops that maintain a variety of fixtures and need standard 1/4 in-20 and 5/16 in-18 thread compatibility.

People who primarily work with very hard hardwoods or require custom materials and coatings for outdoor exposed fasteners might look elsewhere, since the kit is optimized for soft woods and interior furniture use and uses zinc plated carbon steel rather than specialized stainless or coated alloys.

Pros & Cons

Pros

• Excellent variety and quantity that cover common furniture hardware sizes and depths.
• Durable zinc plated carbon steel with a clean, burr-free hex socket for reliable threading.
• Well organized case with labeled compartments simplifies inventory and transport.

Cons

• Some customers report mixed long term durability, so heavy outdoor or high-moisture use may require different materials.

Specifications

Total pieces	340 PCS
Thread sizes	1/4 in-20, 5/16 in-18, 3/8 in-16
Insert lengths	1/4 in-20: 10/15/20/25 mm; 5/16 in-18: 13/15/20/25 mm; 3/8 in-16: 20/25 mm
Material	Carbon steel, zinc plated
Installation tool	6 PCS hex wrench included
Recommended drill bits	9.5 mm, 12 mm, 15 mm
Storage	Reinforced case with labeled inner and outer lids

Our Verdict

The 340PCS Threaded Inserts assortment kit is a practical, cost-effective choice for anyone repairing or building furniture in soft woods, offering an outstanding spread of sizes and a solid storage solution. It represents good value for workshops and DIYers who need reliable, easy to install inserts, while those needing stainless or specialty finishes for outdoor use should consider other options.

Frequently Asked Questions

What drill sizes are recommended?
The review follows the supplied guidance to use 9.5 mm, 12 mm, and 15 mm drill bits depending on insert diameter and length.

Will these inserts work in hardwood?
They are optimized for soft woods like pine, plywood and fiberboard; larger pilot holes are recommended for harder woods and results may vary.

Are installation tools included?
The kit includes a set of hex wrenches and the inserts have a standard internal hex socket for straightforward insertion.