Steel Thick Nuts | McMaster-Carr

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	Material Material	Show

Steel

	Material Material	Hide

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Finish Finish

Zinc Plated

Black Oxide

Cadmium Yellow-Chromate
Plated

Zinc Yellow-Chromate Plated

Hot-Dipped Galvanized

Cadmium Plated

Blue PTFE Coated

	Nut Type Nut Type


Hex	Locknut

	Hex Nut Profile Hex Nut Profile


Extra Wide	Standard

	Width Width

	Height Height

	Specifications Met Specifications Met

	Thread Direction Thread Direction


Right Hand	Left Hand

	Thread Pitch Thread Pitch

	Thread Type Thread Type

	Thread Spacing Thread Spacing

Coarse

Fine

	Thread Fit Thread Fit

Class 2B

Class 6H

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Locking Type Locking Type


Nylon Insert	Steel Insert

Flex-Top	Distorted Thread

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

REACH Compliant

	Insert Maximum Temperature Insert Maximum Temperature

335 Products

About Nuts, Materials, and Finishes

Metric Extreme-Strength Steel
Extra-Wide Hex Nuts—Grade 2H

Comparable in strength to Class 12.9 bolts.

Extreme-Strength Steel Extra-Wide Hex Nuts—Grade 2H

These nuts are comparable in strength to Grade 9 bolts.

Medium-Strength Steel Extra-Wide Hex Nuts—Grade 5

Also kown as heavy hex nuts, these nuts are about 10% wider and taller than standard hex nuts to distribute load over a large area.

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

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

Low-Strength Steel Extra-Wide Hex Nuts

About half the strength of medium-strength steel extra-wide hex nuts, use these nuts for light duty fastening applications, such as securing access panels.

High-Strength Steel Extra-Wide Hex Nuts

These Class 10 nuts are about 25% stronger than medium-strength steel extra-wide hex nuts.

Extreme-Strength Steel Extra-Wide Hex
Nuts for Structural Applications—Grade DH

High-Strength Steel Extra-Wide Hex Nuts
for Structural Applications—Grade C

Steel Extra-Wide Hex Nuts for
High-Pressure Applications

Able to maintain their strength in high-pressure and high temperature environments, these nuts are used with ASTM A193 bolts to fasten pressure tanks, valves, and flanges.

Extreme-Strength Steel Hex Nuts

Metric Extreme-Strength Steel Hex Nuts—Class 12

These metric nuts are about 20% stronger than high strength steel nuts and are often used in heavy machinery.

Extreme-Strength Steel Hex Nuts—Grade 9

These nuts are about 20% stronger than high strength steel nuts and are often used in heavy machinery.

Locknuts

Steel Extra-Wide Nylon-Insert Locknuts

Known for their strength, these locknuts are zinc-plated to resist corrosion in wet environments.

High-Strength Steel Extra-Wide Steel-Insert
Locknuts for Extreme Vibration—Grade 8

High-strength steel locknuts are about 25% stronger than medium-strength steel locknuts.

Medium-Strength Steel Extra-Wide Steel-Insert
Locknuts for Extreme Vibration—Grade 5

These locknuts are suitable for fastening most machinery and equipment.

Steel Extra-Wide Flex-Top Locknuts for Heavy Vibration

Known for their strength, these steel locknuts are cadmium plated to resist corrosion in wet environments.

Extreme-Strength Steel Top-Lock
Distorted-Thread Locknuts

These Grade 9 locknuts are about 20% stronger than high-strength steel locknuts and are often used in heavy machinery, such as earth-moving equipment.

About Nuts, Materials, and Finishes

Extra-Wide Hex Nuts

Metric Extreme-Strength SteelExtra-Wide Hex Nuts—Grade 2H