Steel Heavy 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


Grade 2	Grade 2H

Grade 5	Grade 7

Grade 8	Grade 9

Grade C	Grade DH

Class 10	Class 12

	Finish Finish

Zinc Yellow-Chromate Plated

Black Oxide

Zinc Plated

Hot-Dipped Galvanized

Cadmium Yellow-Chromate
Plated

Black Phosphate

PTFE Coated

Cadmium Plated

Black Ultra-Corrosion-
Resistant Coated

	Nut Type Nut Type


Hex	Locknut

	Hex Nut Profile Hex Nut Profile


Extra Wide	Standard

Extra-Wide Thin

	Width Width

	Thread Direction Thread Direction


Right Hand	Left Hand

	Specifications Met Specifications Met

	Height Height

	Thread Type Thread Type

	Thread Pitch Thread Pitch

	Thread Spacing Thread Spacing

Coarse

Fine

Extra 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

	Locking Type Locking Type


Nylon Insert	Steel Insert

Distorted Thread	Flex-Top

	Insert Maximum Temperature Insert Maximum Temperature

250° F

Not Rated

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431 Products

About Nuts, Materials, and Finishes

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.

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.

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

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.

Low-Strength Steel Extra-Wide Thin Hex Nuts

Use these nuts for light duty fastening applications, such as securing access panels.

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

These nuts are often used in conjunction with an extra-wide hex nut to fasten Grade 9 bolts in heavy machinery, such as earth-moving equipment.

Locknuts

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.

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

Use these locknuts for light duty fastening applications, such as securing access panels.

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.

Metric High-Strength Steel Steel-Insert
Locknuts for Extreme Vibration—Class 10

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

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.

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.

Extra-Wide Thin Flex-Top Locknuts for Heavy Vibration

About half the height and 10% wider than standard flex-top locknuts, use these locknuts in low-clearance applications or jam one against an extra-wide hex nut to hold it in place.

About Nuts, Materials, and Finishes

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

Low-Strength Steel Extra-Wide Hex Nuts

High-Strength Steel Extra-Wide Hex Nuts

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