Name: Hillman 5/16-in x 18 Brass Brass Wood insert Nut Count
Brand: Hillman
SKU: 3012575
Price: 3.98 USD
Availability: InStock
Rating: 3.6 (277 reviews)

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Insert nuts provide strong machine screw threading in soft woods or substrates. External protrusions bite into the wood, preventing the nut from either turning or pulling out. Simply drill a pilot hole, thread in the insert with a screwdriver or T-wrench, and use a machine screw or bolt to attach the other part. Join wood, chipboard and plywood with these brass fasteners which are especially useful in knockdown furniture.

Insert nuts are designed to provide a strong machine thread in soft woods
Brass finish protects against oxidation, contributing to longer quality of life
To install, drill a pilot hole, then insert the nut with a screwdriver or T-wrench, and finally use a machine screw or bolt to attach the other piece
Common applications include woodworking projects
External protrusions bite into the wood, preventing the nut from either turning or pulling out
Parts feature coarse 5/16-in-18 screw thread and a 3/8-in drill size
Item sold individually at retail

General
Finish	Brass	Use Location	Interior
Manufacturer Color/Finish	Gold	Unit of Measure	Count
Type	Wood insert	Measure Type	Standard (SAE)
Material	Brass	Thread Type	Coarse
Package Quantity	1	Thread Pitch	18
Grade	All-Purpose

Dimensions
Inner Diameter Measurement	5/16-in

Features
Threading	Right hand

Warranty
Warranty	None

Certifications
ACQ Approved	No	CA Residents: Prop 65 Warning(s)	No

Miscellaneous
UNSPSC	31161700

Check out the Best Selling Lock Nuts on Lowes.com

Review

3.6 out of 5

277 Reviews

64% Recommend this product

Ratings may include incentivized customer reviews.

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+ 12

What Customers Are Saying

These threaded inserts can be effective if installed correctly, but require care and the right technique. Many noted the inserts are made of soft brass and can easily break if not installed properly. Key tips include using a #10-24 screw with two locking nuts, drilling a pilot hole of the correct size, and going slowly when driving the insert into the wood. Some reviewers also mentioned the packaging lacks clear installation instructions, which can lead to issues. Careful installation is required to avoid breakage, especially in very hard woods.

Customer review summary generated by AI, including incentivized reviews.

277 Customer Reviews

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break off VERY easily

Would Not Recommend

Don't waste your money on these. I broke two of them off using a flat head screwdriver. I drilled 21/64" hole. Google search said to use 5/16" hole. There wasn't much left of them, or I would have returned them to Lowes because I paid about $2.00 apiece. Now I am going to try the hex head inserts. :( It would be nice if Hillman would provide hole size they're designed for, but then they wouldn't sell as many.

DwayneJuly 29, 2026
From 1_SLASH_4-in x 20 Brass Brass Wood insert Nut 2 Count

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Response from Customer Service@Hillman

We are very sorry to hear that this product was unsatisfactory and did not meet your expectations. We understand how disappointing that can be. Pleas...

Customer Service@HillmanJuly 31, 2026

Fits the Bill

Quality brass insert

Snot81June 15, 2026
Verified Purchaser

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		Name	Current Item Hillman5/16-in x 18 Brass Brass Wood insert Nut Count
		Ratings	277
		Material	Brass
		Thread Type	Coarse
		Finish	Brass
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4	126	6	127	471		53	37	33
Steel	Cast zinc	Steel	Steel	Steel		Steel	Steel	Steel
Coarse	Coarse	Coarse	Coarse	Coarse		Coarse	Coarse	Coarse
Zinc-plated	Steel	Zinc-plated	Zinc-plated	Stainless steel		Yellow zinc	Zinc-plated	Zinc-plated