Extra Fine Nuts | McMaster-Carr

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	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Thread Type Thread Type

	Nut Type Nut Type

	Material Material

	Height Height

	Width Width

	Hex Nut Profile Hex Nut Profile


Standard	Thin

Extra-Wide Thin

	Thread Direction Thread Direction


Right Hand	Left Hand

	Thread Spacing Thread Spacing	Show

Extra Fine

	Thread Spacing Thread Spacing	Hide

	Finish Finish

Zinc Yellow-Chromate Plated

Zinc-Flake Coated

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Panel Nut Shape Panel Nut Shape


Hex	Round

	Thread Fit Thread Fit

Class 2B

Class 6H

	Locking Type Locking Type


Nylon Insert	Distorted Thread

Cotter Pin	Steel Insert

Spring-Stop

	Specifications Met Specifications Met

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	OD OD

	Drive Style Drive Style

	External Hex

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	For Spanner Wrench Style For Spanner Wrench Style

	Hook
	Pin

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606 Products

About Nuts, Materials, and Finishes

Medium-Strength Steel Hex Nuts—Grade 5

These nuts are suitable for fastening most machinery and equipment.

Metric Fine-Thread Medium-Strength
Steel Hex Nuts—Class 8

Left-Hand Threaded Medium-Strength
Steel Hex Nuts—Grade 5

These nuts tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion.

JIS Medium-Strength Steel Hex Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1181.

High-Strength Steel Hex Nuts—Grade 8

These nuts are about 25% stronger than medium-strength steel nuts.

Metric Fine-Thread High-Strength
Steel Hex Nuts—Class 10

Closely spaced metric threads prevent these nuts from loosening due to vibration. About 25% stronger than medium-strength steel nuts, these nuts are comparable in strength to Class 10.9 bolts.

Low-Strength Steel Hex Nuts

About half the strength of medium-strength steel nuts, these nuts are for light duty fastening applications.

18-8 Stainless Steel Hex Nuts

These nuts have good chemical resistance and may be mildly magnetic.

Metric Fine-Thread 18-8 Stainless Steel Hex Nuts

Nylon Hex Nuts

Made from nylon 6/6, these nuts resist oil, grease, and solvents (except mineral acids).

Aluminum Hex Nuts

One-third the weight of steel, these aluminum nuts are corrosion resistant in wet environments and nonmagnetic.

Thin Hex Nuts

Medium-Strength Steel Thin Hex Nuts

Made from Grade 5 steel, these inch-sized nuts are suitable for most fastening applications.

Metric Fine-Thread Medium-Strength
Steel Thin Hex Nuts

These nuts are half the height of standard hex nuts, and have closely spaced threads to prevent loosening from vibration. Half as strong as medium-strength steel nuts, they are often used for light-duty applications, such as fastening signs in place.

Low-Strength Steel Thin Hex Nuts

These nuts should be used for light duty fastening applications, such as securing access panels.

Left-Hand Threaded Low-Strength Steel Thin Hex Nuts

These nuts tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion. They’re Grade 2 steel, so they can be used for fastening panels and other light duty fastening applications

High-Strength Steel Thin Hex Nuts—Grade 8

These nuts are about 25% stronger than medium-strength steel thin hex nuts. Available in inch thread sizes.

18-8 Stainless Steel Thin Hex Nuts

These nuts have good chemical resistance and may be mildly magnetic.

Metric Fine-Thread 18-8 Stainless Steel Thin Hex Nuts

Made with fine-pitch threads, vibration is less likely to loosen these metric nuts than those with coarse-pitch threads since the threads sit closer together. Also called jam nuts, they are roughly half the height of standard hex nuts, so they’re good for applications with low clearance.

Left-Hand Threaded 18-8 Stainless Steel Thin Hex Nuts

These nuts tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion.

Metric Super-Corrosion-Resistant
316 Stainless Steel Thin Hex Nuts

These metric nuts are made of 316 stainless steel and half as tall as regular hex nuts—use them around chemicals and salt water when space is limited.

Left-Hand Threaded Super-Corrosion-Resistant
316 Stainless Steel Thin Hex Nuts

With threads that tighten to the left and made of 316 stainless steel, these nuts won’t loosen from counterclockwise motion in saltwater and corrosive environments. They’re half the height of standard hex nuts, so they fit where there’s low clearance.

Left-Hand Threaded Brass Thin Hex Nuts

These nuts tighten to the left and won’t loosen from counterclockwise motion.

Locknuts

High-Strength Steel Nylon-Insert Locknuts—Grade 8

Includes inch thread sizes. These Grade 8 steel locknuts are 25% stronger than our medium-strength steel nylon-insert locknuts.

Metric Fine-Thread High-Strength
Steel Nylon-Insert Locknuts—Class 10

Closely spaced metric threads prevent loosening from vibration. These Class 10 steel locknuts are 25% stronger than our medium-strength steel nylon-insert locknuts.

Metric Fine-Thread Medium-Strength
Steel Nylon-Insert Locknuts—Class 8

Get a grip on metric bolts exposed to vibration, wear, and changes in temperature. These metric locknuts have a nylon insert that holds onto bolts without damaging their threads.

Metric 18-8 Stainless Steel Nylon-Insert Locknuts

These metric locknuts have good chemical resistance.

Super-Corrosion-Resistant 316
Stainless Steel Nylon-Insert Locknuts

More corrosion resistant than 18-8 stainless steel locknuts, these locknuts have excellent resistance to chemicals and salt water.

High-Strength Steel Extra-Wide
Thin Nylon-Insert Locknuts

Comparable in strength to Grade 8 bolts, these locknuts are about three times stronger than low-strength steel extra-wide thin locknuts.

High-Strength Steel Top-Lock
Distorted-Thread Locknuts

Comparable in strength to Grade 8 bolts, these locknuts are about 25% stronger than medium-strength steel locknuts.

Metric Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Class 8

These metric locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts.

Metric Medium-Strength Steel Center-Lock
Distorted-Thread Locknuts—Class 8

Strong enough for use with most machinery and equipment, these Class 8 metric locknuts have an irregularly shaped thread in the middle of the nut that grips bolts tighter than nylon-insert locknuts.

Medium-Strength Steel Locknuts
for use with Cotter Pins—Grade 5

Also known as castle nuts, secure these nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance.

Low-Strength Steel Locknuts for use with Cotter Pins

About half the strength of medium-strength steel locknuts, these are for light duty fastening applications, such as securing access panels.

Steel-Insert Locknuts for Extreme Vibration—Grade 5

When installed, the steel insert grips the threads and lifts away from the nut body, isolating the insert from the nut's load to resist spinoff caused by vibration.

Metric Low-Strength Steel
Spring-Stop Locknuts—Class 6

These locknuts, also known as Fuji locknuts, maintain their holding power with reuse longer than nylon-insert locknuts. They have a spring ring that creates tension as you tighten the nut, keeping them in place.

Flange Nuts

Metric High-Strength Steel Nylon-Insert
Flange Locknuts—Class 10

High-Strength Steel Flange Nuts—Grade 8

Made from Grade 8 steel, these nuts are about 25% stronger than medium-strength steel flange nuts.

Metric High-Strength Steel Flange Nuts—Class 10

Also known as collar nuts, these metric nuts have a flange that distributes pressure across the surface, so you don't need a washer. Made of high-strength Class 10 steel, they’re about 25% stronger than medium-strength steel flange nuts.

JIS High-Strength Steel Flange Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1190.

Metric Medium-Strength Steel Flange Nuts—Class 8

No need for a washer—these metric medium-strength steel nuts have a flange that distributes pressure across its surface the way a washer does. Made of medium-strength, Class 8 steel, they’re suitable for fastening most machinery and equipment.

JIS Medium-Strength Steel Flange Nuts

Made to Japanese Industrial Standards, these nuts fasten most Japanese machinery and equipment without a washer.

Round Coupling Nuts

A smooth rounded body provides a finished look.

Panel Nuts

Steel Hex Panel Nuts

These steel panel nuts are zinc plated for corrosion resistance.

Stainless Steel Hex Panel Nuts

All of these stainless steel panel nuts have some chemical resistance.

Brass Hex Panel Nuts

Brass panel nuts are corrosion resistant in wet environments and electrically conductive.

Knurled Panel Nuts

These panel nuts are knurled to provide a secure grip for tightening and loosening by hand.

Bearing Retaining Nuts

Bearing Retaining Locknuts

With a nylon insert that grips your threaded shaft or spindle without damaging its threads, these locknuts—also called shaft nuts—hold bearings, bushings, gears, and pulleys prone to vibration tightly in place.

Bearing Retaining Nuts

Often paired with spring lock washers to strengthen their hold, these retaining nuts—also known as shaft nuts—keep vibration from shifting bearings, bushings, pulleys, and gears on your threaded shaft or spindle.

Bearing Retaining Jam Nuts

Used in pairs or with another bearing retaining nut, these jam nuts—often called shaft nuts—hold bearings, bushings, pulleys, and gears in place on your threaded shaft or spindle.

About Nuts, Materials, and Finishes

Hex Nuts

Medium-Strength Steel Hex Nuts—Grade 5

Metric Fine-Thread Medium-StrengthSteel Hex Nuts—Class 8

Left-Hand Threaded Medium-StrengthSteel Hex Nuts—Grade 5

JIS Medium-Strength Steel Hex Nuts

High-Strength Steel Hex Nuts—Grade 8

Metric Fine-Thread High-StrengthSteel Hex Nuts—Class 10

Low-Strength Steel Hex Nuts

18-8 Stainless Steel Hex Nuts

Metric Fine-Thread 18-8 Stainless Steel Hex Nuts

Nylon Hex Nuts

Aluminum Hex Nuts

Thin Hex Nuts

Medium-Strength Steel Thin Hex Nuts

Metric Fine-Thread Medium-StrengthSteel Thin Hex Nuts

Low-Strength Steel Thin Hex Nuts

Left-Hand Threaded Low-Strength Steel Thin Hex Nuts

High-Strength Steel Thin Hex Nuts—Grade 8

18-8 Stainless Steel Thin Hex Nuts

Metric Fine-Thread 18-8 Stainless Steel Thin Hex Nuts

Left-Hand Threaded 18-8 Stainless Steel Thin Hex Nuts

Metric Super-Corrosion-Resistant316 Stainless Steel Thin Hex Nuts

Left-Hand Threaded Super-Corrosion-Resistant316 Stainless Steel Thin Hex Nuts

Left-Hand Threaded Brass Thin Hex Nuts

Locknuts

High-Strength Steel Nylon-Insert Locknuts—Grade 8

Metric Fine-Thread High-StrengthSteel Nylon-Insert Locknuts—Class 10

Metric Fine-Thread Medium-StrengthSteel Nylon-Insert Locknuts—Class 8

Metric 18-8 Stainless Steel Nylon-Insert Locknuts

Super-Corrosion-Resistant 316Stainless Steel Nylon-Insert Locknuts

High-Strength Steel Extra-WideThin Nylon-Insert Locknuts

High-Strength Steel Top-LockDistorted-Thread Locknuts

Metric Medium-Strength Steel Top-LockDistorted-Thread Locknuts—Class 8

Metric Medium-Strength Steel Center-LockDistorted-Thread Locknuts—Class 8

Medium-Strength Steel Locknutsfor use with Cotter Pins—Grade 5

Low-Strength Steel Locknuts for use with Cotter Pins

Steel-Insert Locknuts for Extreme Vibration—Grade 5

Metric Low-Strength SteelSpring-Stop Locknuts—Class 6

Flange Nuts

Metric High-Strength Steel Nylon-InsertFlange Locknuts—Class 10

High-Strength Steel Flange Nuts—Grade 8

Metric High-Strength Steel Flange Nuts—Class 10

JIS High-Strength Steel Flange Nuts

Metric Medium-Strength Steel Flange Nuts—Class 8

JIS Medium-Strength Steel Flange Nuts

Round Coupling Nuts

Round Coupling Nuts

Panel Nuts

Steel Hex Panel Nuts

Stainless Steel Hex Panel Nuts

Brass Hex Panel Nuts

Knurled Panel Nuts

Bearing Retaining Nuts

Bearing Retaining Locknuts

Bearing Retaining Nuts

Bearing Retaining Jam Nuts

Metric Fine-Thread Medium-Strength
Steel Hex Nuts—Class 8

Left-Hand Threaded Medium-Strength
Steel Hex Nuts—Grade 5

Metric Fine-Thread High-Strength
Steel Hex Nuts—Class 10

Metric Fine-Thread Medium-Strength
Steel Thin Hex Nuts

Metric Super-Corrosion-Resistant
316 Stainless Steel Thin Hex Nuts

Left-Hand Threaded Super-Corrosion-Resistant
316 Stainless Steel Thin Hex Nuts

Metric Fine-Thread High-Strength
Steel Nylon-Insert Locknuts—Class 10

Metric Fine-Thread Medium-Strength
Steel Nylon-Insert Locknuts—Class 8

Super-Corrosion-Resistant 316
Stainless Steel Nylon-Insert Locknuts

High-Strength Steel Extra-Wide
Thin Nylon-Insert Locknuts

High-Strength Steel Top-Lock
Distorted-Thread Locknuts

Metric Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Class 8

Metric Medium-Strength Steel Center-Lock
Distorted-Thread Locknuts—Class 8

Medium-Strength Steel Locknuts
for use with Cotter Pins—Grade 5

Metric Low-Strength Steel
Spring-Stop Locknuts—Class 6

Metric High-Strength Steel Nylon-Insert
Flange Locknuts—Class 10