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Hillman 5/16-in x 18 Black phosphate Steel Hex Nut 2 -Pack

Name: Hillman 5/16-in x 18 Black phosphate Steel Hex Nut 2 -Pack
Brand: Hillman
SKU: 3012474
Price: 1.48 USD
Rating: 4.7 (2463 reviews)

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4.7

2463

Inner Diameter Measurement: 5/16-in

Finish: Black phosphate

$1.48

Package Quantity: 2

Thread Pitch: 18

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Hex nuts are used to prevent shear movement and tension when adhering facing materials together with machine bolts. Hex nuts are commonly used in wood to wood, wood to metal, and metal to metal applications. The black phosphate finish combines moderate corrosion resistance with aesthetics to match surrounding hardware. Be sure to pre-drill any holes and to use bolts that are a similar grade and finish. Parts feature a free-spinning flat washer that tightens as the nut is installed.

Hex nuts are designed to mechanically join materials by fastening to a bolt
Black phosphate finish combines moderate corrosion resistance with aesthetics to match surrounding hardware
Can be installed by screwing onto exposed thread by hand and tightening with a wrench
Safe for use in most general home and commercial applications
Recommended for use with bolts of a similar size and finish
Attached washer is free-spinning but tightens with the nut
Parts feature USS coarse 5/16-in-18 screw thread

General
Finish	Black phosphate	Use Location	Interior/Exterior
Manufacturer Color/Finish	Black	Unit of Measure	Count
Type	Hex	Measure Type	Standard (SAE)
Material	Steel	Thread Type	Coarse
Package Quantity	2	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 Hex Nuts on Lowes.com

Review

4.7 out of 5

2463 Reviews

94% Recommend this product

Ratings may include incentivized customer reviews.

+ 30 images

What Customers Are Saying

These hex nuts are generally viewed as a high-quality, durable hardware product suitable for a variety of home improvement and repair projects. Customers report the nuts have good threads, a sturdy galvanized finish, and fit their bolts well, making them easy to install. While a few experienced minor issues, the overall sentiment is very positive, with customers appreciating the nuts' versatility and reasonable pricing.

Customer review summary generated by AI, including incentivized reviews.

2463 Customer Reviews

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Nut for project

Would Recommend

Nut for bolt worked well.

CTMMApril 8, 2026
From 5_SLASH_16-in x 18 Yellow zinc Steel Hex Nut 4 -Pack Verified Purchaser

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good price good quality

Would Recommend

good product

eegoldApril 8, 2026
From #8 x 32 Stainless steel Steel Hex Nut 16 -Pack Verified Purchaser

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Great

Would Recommend

Pairs with my carriage bolt to keep mg flooring from loosening

ExoButtApril 8, 2026
From 3_SLASH_8-in x 16 Galvanized Steel Hex Nut Verified Purchaser

Was this Review Helpful ?

Strong high quality stainless steel nuts.

Would Recommend

Strong high quality stainless steel nuts. I used these as part of a recent cb antenna installation.

Old Grey BeardApril 8, 2026
From 3_SLASH_8-in x 24 Stainless steel Steel Hex Nut 2 -Pack Verified Purchaser

Was this Review Helpful ?

Great product at good value

Would Recommend

As advertised

BigriggerApril 8, 2026
From #8 x 32 Brass Brass Hex Nut 3 -Pack Verified Purchaser

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Hillman 5/16-in x 18 Black phosphate Steel Hex Nut 2 -Pack

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Pickup

Shipping

Delivery

Overview

Product Features

Specifications

General

Finish

Use Location

Manufacturer Color/Finish

Unit of Measure

Type

Measure Type

Material

Thread Type

Package Quantity

Thread Pitch

Grade

Dimensions

Inner Diameter Measurement

Features

Threading

Warranty

Warranty

Certifications

ACQ Approved

CA Residents: Prop 65 Warning(s)

Miscellaneous

UNSPSC

What Customers Are Saying

Community Q & A

57 Questions

57 Questions

Hillman: Featured Videos

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Hillman 5/16-in x 18 Black phosphate Steel Hex Nut 2 -Pack

Shop Hillman

Pickup

Shipping

Delivery

Overview

Product Features

Specifications

Community Q & A

Hillman: Featured Videos

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