E-Z LOK 400-3-CR Threaded Inserts for Wood - Strong Machine Threads

In this review of the E-Z LOK 400-3-CR threaded inserts, the bottom line is simple: woodworkers and cabinetmakers who need reliable machine threads in solid wood will find a practical kit here. The package includes six 10-24 knife thread inserts, a drill and an installation driver so you can install fasteners without hunting for tools. The biggest reason to buy is that these inserts create a strong metal-to-wood threaded anchor that works well for furniture repair, hinges, and marine trim where a durable machine thread is required.

Key Features

• Installation Kit: Comes with inserts, a drill and an installation driver so users have the basic tools needed to fit the parts straight from the box.
• Knife Thread Design: The proprietary external thread bites into wood for superior holding power compared with smooth inserts.
• Stainless Steel Construction: Stainless components resist corrosion and are suitable for damp environments like marine applications and storm windows.
• Brass/UNC Threads: Standard UNC 10-24 internal machine threads provide compatibility with common fasteners used in furniture and cabinetry.
• Quick Installation: Inserts are designed to be installed rapidly when the correct pilot hole and driver are used, making small repair jobs efficient.

Who It's For

The kit is aimed at woodworkers, furniture restorers, and contractors who need to replace stripped hinge screws or add machine threads to solid wood components. Its included drill and driver make it a good choice for hobbyists and pros who want a simple solution without assembling a separate tool set.

Those who primarily work with plywood or very thin laminates should look elsewhere, as these knife thread inserts are intended for solid wood and are not recommended for plywood. Also, buyers planning heavy industrial duty applications should consider larger specialty inserts designed for higher cyclical loads.

Pros & Cons

Pros

• Provides a reliable machine thread in wood for repair and assembly tasks.
• Kit format includes drill and driver so you can start work immediately.
• Stainless steel hardware offers corrosion resistance for marine and exterior use.
• Knife thread profile gives strong holding power in solid wood.

Cons

• Some users report the provided installation driver can be incorrect or break, so having a backup driver is advised.
• Not recommended for plywood or very thin materials where the thread profile will not hold properly.

Specifications

Brand	E-Z LOK
Model	400-3-CR installation kit
Insert size	10-24 UNC
Material	Stainless steel inserts, brass components noted
Includes	6 knife thread inserts, drill and installation tool
Intended use	Furniture, cabinetry, storm windows, marine applications

Our Verdict

The E-Z LOK 400-3-CR kit is a practical, good-value option for anyone needing to add or restore machine threads in solid wood. It delivers solid holding power with its knife thread design and includes the basic tools to get started, though users should be prepared with an alternative driver for heavy use. Overall, it is a dependable choice for furniture repair and cabinetry work.

Frequently Asked Questions

Can these inserts be used in plywood?
They are not recommended for plywood; the proprietary external thread performs best in solid wood where it can properly bite and hold.

Are the inserts corrosion resistant?
Yes, the kit uses stainless steel inserts suitable for damp environments like marine trim and storm windows.

Does the kit include everything needed to install?
It includes a drill and installation driver along with six 10-24 knife thread inserts, but some users prefer a spare driver in case of breakage.