Name: Hillman 1/4-in x 20 Stainless steel Steel Nylon insert Nut 6 Count
Brand: Hillman
SKU: 4756509
Price: 3.98 USD
Availability: InStock
Rating: 4.7 (504 reviews)

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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 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 washers of a similar size and finish
Parts feature coarse 1/4-in-20 screw thread
6 pieces per retail package

General
Finish	Stainless steel	Use Location	Exterior
Manufacturer Color/Finish	Silver	Unit of Measure	Count
Type	Nylon insert	Measure Type	Standard (SAE)
Material	Steel	Thread Type	Coarse
Package Quantity	6	Thread Pitch	20
Grade	All-Purpose

Dimensions
Inner Diameter Measurement	1/4-in

Features
Threading	Right hand

Warranty
Warranty	None

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

Miscellaneous
UNSPSC	31161700

Check out the Best Selling Lock Nuts on Lowes.com

Review

4.7 out of 5

504 Reviews

93% Recommend this product

Ratings may include incentivized customer reviews.

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What Customers Are Saying

Customers overwhelmingly praise these stainless steel nylon lock nuts for exceptional reliability and durability. Reviewers consistently highlight the nylon insert's effectiveness in preventing loosening under heavy vibration, with many noting the nuts stay secure without additional hardware. The rust-resistant stainless steel construction earns strong approval for outdoor and weather-exposed applications. Customers appreciate the precise sizing, smooth threading, and easy installation. A few report minor issues with nylon insert weakness, but these concerns are rare and vastly outweighed by widespread satisfaction with long-term performance.

Customer review summary generated by AI, including incentivized reviews.

504 Customer Reviews

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Nut for trolling mount

These really tightened down the nut but I still put on locktite.

workermanOctober 11, 2026
From #10 x 24 Stainless steel Steel Nylon insert Nut 8 Count Verified Purchaser

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No rust

Not rusting!

Carla byOctober 11, 2026
From #10 x 24 Stainless steel Steel Nylon insert Nut 8 Count Verified Purchaser

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Quality product.

Used in combination with same brand screws. Outdoor use for a few weeks now with no rust or staining. Nylon inserts have held up well to vibration.

DaveJrOctober 11, 2026
From #10 x 24 Stainless steel Steel Nylon insert Nut 8 Count Verified Purchaser

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Correctly tapped threads!

and the nylon was installed correctly.

C WiringOctober 9, 2026
From 1_SLASH_4-in x 28 Stainless steel Steel Nylon insert Nut 3 Count Verified Purchaser

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Held great and threaded on bolts with ease

Would Recommend

Purchased with 3/16" SS Bolts. Thread was perfect. Great product. Would buy again

BrenOctober 7, 2026
From 5_SLASH_16-in x 24 Stainless steel Steel Nylon insert Nut 2 Count Verified Purchaser

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Would Recommend

Exactly what I was looking for!

Threaded rodOctober 2, 2026
From #10 x 24 Stainless steel Steel Nylon insert Nut 8 Count Verified Purchaser

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Stainless steel bolt

Would Recommend

I needed a bolt for our outdoor umbrella. This was a good fit

PapaSeptember 28, 2026
From #10 x 24 Stainless steel Steel Nylon insert Nut 8 Count Verified Purchaser

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		Name	Current Item Hillman1/4-in x 20 Stainless steel Steel Nylon insert Nut 6 Count
		Ratings	504
		Material	Steel
		Thread Type	Coarse
		Finish	Stainless steel
Hillman1/4-in x 20 Zinc-plated Steel Nylon insert Nut 25 Count	Hillman1/4-in x 20 Steel Cast zinc Wood insert Nut 4 Count	Hillman1/4-in x 20 Yellow zinc Steel Nylon insert Nut 3 Count	Hillman5/16-in x 18 Zinc-plated Stainless steel Nylon insert Nut 5 Count	Hillman5/16-in x 18 Zinc-plated Steel Nylon insert Nut 25 Count	Hillman3/8-in x 16 Zinc-plated Steel Nylon insert Nut 25 Count	Hillman1/4-in x 20 Zinc-plated Steel Wood insert Nut 4 Count	Hillman1/2-in x 13 Zinc-plated Steel All metal Nut 2 Count
43	135	59		42	39	135	60
Steel	Cast zinc	Steel	Stainless steel	Steel	Steel	Steel	Steel
Coarse	Coarse	Coarse	Coarse	Coarse	Coarse	Coarse	Coarse
Zinc-plated	Steel	Yellow zinc	Zinc-plated	Zinc-plated	Zinc-plated	Zinc-plated	Zinc-plated