Hex Thick Nuts | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Material Material

	Finish Finish

Zinc Plated

Hot-Dipped Galvanized

Black Oxide

Cadmium Yellow-Chromate
Plated

Zinc Yellow-Chromate Plated

Cadmium Plated

PTFE Coated

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Nut Type Nut Type


Hex	Locknut

	Hex Nut Profile Hex Nut Profile


Standard	Extra Wide

	Width Width

	Height Height

	Thread Direction Thread Direction


Right Hand	Left Hand

	Thread Spacing Thread Spacing

Coarse

Fine

	Specifications Met Specifications Met

	Thread Type Thread Type

	Thread Pitch Thread Pitch

	Thread Fit Thread Fit

Class 2B

Class 6H

	Locking Type Locking Type


Nylon Insert	Steel Insert

Flex-Top	Distorted Thread

	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

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Insert Maximum Temperature Insert Maximum Temperature

463 Products

About Nuts, Materials, and Finishes

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.

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.

High-Strength Super-Corrosion-Resistant 316
Stainless Steel Hex Nuts for High-Pressure Applications

Hardened for added strength, these nuts are more corrosion resistant to chemicals and salt water than 18-8 stainless steel nuts.

Extra-Wide Hex Nuts

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

These nuts are comparable in strength to Grade 9 bolts.

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

Comparable in strength to Class 12.9 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.

High-Strength Steel Extra-Wide Hex Nuts

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

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.

18-8 Stainless Steel Extra-Wide Hex Nuts

These nuts have good chemical resistance.

Brass Extra-Wide Hex Nuts

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

Super-Corrosion-Resistant 316
Stainless Steel Extra-Wide Hex Nuts

More corrosion resistant than 18-8 stainless steel nuts, these nuts can be used in saltwater environments.

Bronze Extra-Wide Hex Nuts

Bronze nuts are stronger and more resistant to salt water than brass nuts.

18-8 Stainless Steel Extra-Wide Hex
Nuts for High-Pressure Applications

These nuts have good chemical resistance.

Super-Corrosion-Resistant 316 Stainless Steel
Extra-Wide Hex Nuts for High-Pressure Applications

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

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.

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

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

Locknuts

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 Nylon-Insert Locknuts

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

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

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

18-8 Stainless Steel Extra-Wide Nylon-Insert Locknuts

These locknuts have good chemical resistance.

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.

Stainless Steel Extra-Wide Flex-Top
Locknuts for Heavy Vibration

Stainless steel locknuts have excellent corrosion resistance in most 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

Hex Nuts

Extreme-Strength Steel Hex Nuts—Grade 9

Metric Extreme-Strength Steel Hex Nuts—Class 12

High-Strength Super-Corrosion-Resistant 316Stainless Steel Hex Nuts for High-Pressure Applications

Extra-Wide Hex Nuts

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

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

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

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

High-Strength Steel Extra-Wide Hex Nuts

Low-Strength Steel Extra-Wide Hex Nuts

18-8 Stainless Steel Extra-Wide Hex Nuts

Brass Extra-Wide Hex Nuts

Super-Corrosion-Resistant 316Stainless Steel Extra-Wide Hex Nuts

Bronze Extra-Wide Hex Nuts

18-8 Stainless Steel Extra-Wide HexNuts for High-Pressure Applications

Super-Corrosion-Resistant 316 Stainless SteelExtra-Wide Hex Nuts for High-Pressure Applications

Steel Extra-Wide Hex Nuts forHigh-Pressure Applications

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

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