Ask Mylow

Mylow is an AI virtual assistant.

More Information

Can I use these with bolts?Is it corrosion resistant?How do I install this?Does this prevent loosening?What is the warranty period?

Hillman 1/4-in x 20 Stainless steel Steel Nylon insert Nut

Name: Hillman 1/4-in x 20 Stainless steel Steel Nylon insert Nut
Brand: Hillman
SKU: 4756057
Rating: 4.9 (155 reviews)

4.9

155

Members save more.

This item is no longer sold on Lowes.com

Here are some similar items...

Hillman3/8-in x 16 Zinc-plated Steel Nylon insert Nut 25

Hillman3/8-in x 16 Zinc-plated Steel Nylon insert Nut

1074

Hillman1/4-in x 20 Zinc-plated Steel Nylon insert Nut

1074

Hillman5/16-in x 18 Zinc-plated Steel Nylon insert Nut 25

Hillman5/16-in x 18 Stainless steel Steel Nylon insert Nut

142

Hillman1/2-in x 13 Zinc-plated Steel Nylon insert Nut

1074

Hillman6mm x 1 Zinc-plated Steel Nylon insert Nut 4

195

Hillman1/4-in x 20 Stainless steel Steel Nylon insert Nut 6

492

Hillman6mm x 1.00 Zinc-plated Steel Nylon insert Nut 4

1074

Hillman5/8-in x 11 Zinc-plated Steel Nylon insert Nut

1074

Hillman#10 x 24 Stainless steel Steel Nylon insert Nut 8

492

Hillman5/16-in x 18 Zinc-plated Steel Nylon insert Nut

1074

Hillman1/4-in x 20 Zinc-plated Steel Nylon insert Nut 25

Hillman1/4-in x 20 Stainless steel Steel Nylon insert Nut 5

492

Hillman1/4-in x 20 Steel Cast zinc Wood insert Nut 4

131

Best Price. Guaranteed

Find a lower price on an exact item? We'll match it. Some exclusions apply.

Price Guarantee

FREE Returns

Return it in store or ship it back for free. Eligibility rules apply.

Return Policy

FREE Shipping

Delivery is on us for orders over $45. Some exclusions apply.

Shipping Details

These nylon insert stop nuts, also known as lock nuts, are ideal to securely fasten a bolt when connecting materials. Use these hexagonal nuts with bolts and washers of the same material, finish, and grade. The nylon ring inside the nut creates rotational resistance when displaced by a mating male threaded fastener, thus preventing loosening. The nylon insert also helps resist vibration and adds extra corrosion resistance.

Stop nuts are designed to be fastened to a bolt when mechanically joining materials
Stainless steel finish offers best-in-class corrosion resistance
Install with hand tools such as a combination wrench
Nylon insert offers added security against loosening from vibration
Recommended for use with bolts and rods of a similar size and finish
Parts feature coarse threads

General
Finish	Stainless steel	Unit of Measure	Count
Measure Type	Standard (SAE)	Use Location	Interior/Exterior
Type	Nylon insert	Thread Type	Coarse
Package Quantity	1	Material	Steel
Thread Pitch	20	Fastener Speed Code	YCL
Manufacturer Color/Finish	Stainless steel

Dimensions
Inner Diameter Measurement	1/4-in

Features
Threading	Right hand

Warranty
Warranty	None

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

Miscellaneous
UNSPSC	31161700

Check out the Best Selling Lock Nuts on Lowes.com

Review

4.9 out of 5

155 Reviews

2 Star

97% Recommend this product

Ratings may include incentivized customer reviews.

Read All Reviews

What Customers Are Saying

Customers overwhelmingly praise these locking nuts for exceptional performance and durability. The nylon locking insert reliably prevents loosening under vibration and stress in demanding applications like bike seats, wagon axles, and outdoor brackets. Reviewers consistently note the insert holds securely without slipping and resists degradation from sun exposure and moisture. The stainless steel construction delivers strong corrosion resistance, making it ideal for outdoor use on docks and benches. Most customers confirm the nuts fit correctly, perform as expected, and offer excellent value. A single isolated report of a fulfillment error does not reflect product quality.

Customer review summary generated by AI, including incentivized reviews.

155 Customer Reviews

Sort By

Great product

Would Recommend

I bought these nylon nuts to secure my squat rack to the carriage bolts. They have a good consistent finish, and seem to work as i expected. No issues with them to report. I would reccommend them over regular nuts.

alexSeptember 22, 2026
From 1_SLASH_4-in x 20 Stainless steel Steel Nylon insert Nut Count Verified Purchaser

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/08e2e832-ed74-5cf0-9051-ba0c47301a00

Was this Review Helpful ?

Holds tightly

Would Recommend

Bought this to go with the bolt and it’s perfect for the job.

MstrgnrSeptember 21, 2026
From 1_SLASH_4-in x 20 Stainless steel Steel Nylon insert Nut Count Verified Purchaser

Was this Review Helpful ?

Performed as expected

Would Recommend

Met my needs

September 21, 2026
From 1_SLASH_4-in x 20 Stainless steel Steel Nylon insert Nut Count Verified Purchaser

Was this Review Helpful ?

Perfect bolt!

Broke these bolts to help secure porch railings. Just what I needed to re-attach my railings.

Silver hair ladyAugust 29, 2026
From 1_SLASH_4-in x 20 Stainless steel Steel Nylon insert Nut Count Verified Purchaser

Was this Review Helpful ?

Decent nut

Would Recommend

Good strong nuts. So far, this nut remains shiny and strong.

britpodSeptember 1, 2026
From 1_SLASH_4-in x 20 Stainless steel Steel Nylon insert Nut Count Verified Purchaser

Was this Review Helpful ?

Small purchase , big fix

Would Recommend

I only neede one of these locknuts, but it was for a very important purpose. It held down my carberator scoop on my race car at 120 mph. Great job

PinkJuly 18, 2026
Verified Purchaser

Was this Review Helpful ?

Perfect for my needs

Littlebink25September 3, 2026
From 1_SLASH_4-in x 20 Stainless steel Steel Nylon insert Nut Count Verified Purchaser

Was this Review Helpful ?

Wrong item in order

Would Not Recommend

not only did they give me a nut that is NOT a nylon nut, it is the wrong thread count. you can't make it up.........

KevinMay 11, 2026
Verified Purchaser

Was this Review Helpful ?

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@HillmanMay 13, 2026

Perfect for the job

Would Recommend

I used these to bolt a toolbox to my truck. They were perfect size and hold great!

June 15, 2026
Verified Purchaser

Was this Review Helpful ?

Best Nut Ever

Would Recommend

This was a fantastic nut. It’s nuts but it did exactly what it was supposed to do. I recommend this nut. Nutty that it is so good.

Kurt Lee KMarch 29, 2026
Verified Purchaser

Was this Review Helpful ?

Hillman 1/4-in x 20 Stainless steel Steel Nylon insert Nut

Here are some similar items...

Overview

Product Features

Specifications

General

Finish

Unit of Measure

Measure Type

Use Location

Type

Thread Type

Package Quantity

Material

Thread Pitch

Fastener Speed Code

Manufacturer Color/Finish

Dimensions

Inner Diameter Measurement

Features

Threading

Warranty

Warranty

Certifications

CA Residents: Prop 65 Warning(s)

ACQ Approved

Miscellaneous

UNSPSC

What Customers Are Saying

Community Q & A

3 Questions

Hillman: Featured Videos