E-Z LOK 400-M5 Threaded Inserts for Wood Installation Kit - Durable M5

In this review the E-Z LOK 400-M5 Threaded Inserts for Wood Installation Kit proves itself as a practical solution for anyone needing reliable machine threads in hard woods. The kit's single biggest selling point is the proprietary E-Z Knife external thread, which bites into oak, cherry, and maple to give far better holding power than a simple wood pilot hole. It is especially useful for furniture makers, cabinet shops, and maintenance crews who need repeatable, serviceable threads without resorting to metal work.

Key Features

• Knife thread design: The external knife thread slices into hardwood to create a secure mechanical lock that resists pullout and thread erosion.
• Complete installation kit: Includes M5-0.8 knife thread inserts, a drill bit, and an installation drive tool so a user can install inserts right away without sourcing extra parts.
• Brass or stainless options: Brass inserts are standard for general use while stainless steel is recommended for very hard woods or corrosion resistance.
• Hardwood compatibility: Designed for dense woods such as oak, cherry, and maple where a durable machine thread is required for repeated assembly and disassembly.
• Prevents thread stripping: Inserts give a metal working surface inside the wood to avoid stripping or degradation of the original wood threads over time.

Who It's For

The kit is best for furniture builders, cabinetmakers, and repair technicians who need dependable, serviceable threads in hardwoods for legs, hardware, and fixtures. It also suits DIYers working on display cases, partitions, or shipping crates who want screws that can be removed and reinstalled multiple times.

People working primarily with softwoods, delicate veneers, or where flush aesthetic bedding is the only concern may prefer other fastening methods; likewise, those requiring many different thread sizes will need to source additional insert sizes since this kit focuses on M5-0.8 inserts.

Pros & Cons

Pros

• Provides strong holding power in hardwoods thanks to the knife thread profile.
• Kit format includes the essential drill bit and drive tool so installations can begin immediately.
• Availability in brass or stainless steel gives a corrosion option for demanding environments.
• Good solution for preventing thread stripping and extending the life of wood fastened joints.

Cons

• Some users report the included installation drive tool can be less durable than expected under heavy use.
• The supplied drill bit size received mixed feedback and may not suit every project without verification.

Specifications

Brand	E-Z LOK
Insert size	M5-0.8 knife thread inserts (6 included)
Material options	Brass or stainless steel
Intended wood	Hard woods such as oak, cherry, maple
Kit contents	Threaded inserts, drill bit, installation drive tool
Use case	Furniture, partitions, display cases, shipping containers

Our Verdict

The E-Z LOK 400-M5 kit is a solid, economical choice for anyone needing reliable machine threads in hardwoods; its knife thread design and included installation tools make it easy to install and service fastened joints. It represents good value for furniture makers and repair technicians who prioritize holding strength and repeatable assemblies, though heavy industrial users may want sturdier dedicated tools.

Frequently Asked Questions

Are these inserts suitable for softwood?
They are designed for hard woods; in softwoods the holding power will be less reliable and a different insert or installation method may be preferable.

Does the kit include everything needed to install the inserts?
Yes, the kit includes M5 inserts, a drill bit, and an installation drive tool so you can start installing immediately.

When should I choose stainless steel over brass?
Choose stainless steel for very hard woods or where corrosion resistance is required, such as outdoor or high humidity environments.