5/8"-18 Nuts | McMaster-Carr

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	System of Measurement System of Measurement

	Thread Size Thread Size	Show

	Thread Size Thread Size	Hide

	Nut Type Nut Type


Cap	Coupling

Flange	Hex

Locknut	Sealing

Socket Head	Tamper Resistant

Thumb	Tube End

	Material Material

Stainless
Steel

	Finish Finish

Aluminum Plated

Black Phosphate

Cadmium Yellow-Chromate
Plated

Trivalent Zinc Plated

Zinc Yellow-Chromate Plated

Zinc-Aluminum Coated

	Hex Nut Profile Hex Nut Profile


Standard	Thin

Extra Wide	High

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 2	Grade 2H

Grade 5	Grade 8

Grade 9	Grade C

Grade G

	Thread Direction Thread Direction


Right Hand	Left Hand

	Thread Spacing Thread Spacing

	Width Width

	Height Height

	Locking Type Locking Type


Nylon Insert	Serrations

Distorted Thread	Flex-Top

Cotter Pin	Steel Insert

	Thread Type Thread Type

	Thread Fit Thread Fit

	Drive Style Drive Style


External Hex	Hex

External 12- Point	Tri-Groove

	Specifications Met Specifications Met

ASTM

Fed. Spec.

Mil. Spec.

SAE

UL

	For Tube OD For Tube OD

	Flange Diameter Flange Diameter

	Threading Threading

	Fully Threaded
	Partially Threaded

	Insert Maximum Temperature Insert Maximum Temperature

	Length Length

	For Tube Wall Thickness For Tube Wall Thickness

	Flange Thickness Flange Thickness

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168 Products

Nuts

Hex Nuts

Hex Nuts

Use for general purpose fastening applications.

Locknuts

Locknuts

These nuts have a locking feature to resist loosening.

Flange Nuts

Flange Nuts

The flange distributes pressure where the nut meets the material surface, eliminating the need for a separate washer.

Cap Nuts

Cap Nuts

Cover and protect threads while providing a finished appearance.

Coupling Nuts

Also known as extension nuts, use these to connect and extend threaded rods. They’re about three times taller than standard hex nuts.

Thumb Nuts

Thumb nuts provide a secure grip for tightening and loosening by hand.

Socket Nuts

Socket Nuts

Also known as Allen nuts, use these nuts with socket head cap screws in recessed holes and tight spaces that don't have enough clearance for a wrench.

Tamper-Resistant Nuts

testString

Also known as security nuts, these nuts are difficult to remove without special tools.

Tube-End Nuts

Connect threaded parts to steel tubes.

Sealing Nuts

Sealing Nuts

A molded-in seal prevents leaks and seals out contaminants.

Other Nuts

Female Thread Adapters

Female Thread Adapters

Pipe, Tubing, Hose, and Fittings

Pipe, Tubing, Hose, and Fittings

Handle Nuts

Use these handles for quick assembly and disassembly. Their offset grip provides leverage, making them a good alternative to wing nuts.

Turnbuckle Bodies

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The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)