Black-Oxide Steel Hex Nuts

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Black Oxide

	Finish Finish	Hide

Black Coated

Black Oxide

Black Phosphate

Black Ultra-Corrosion-
Resistant Coated

Black Zinc Plated

Blue Dyed

Cadmium Plated

Cadmium Yellow-
Chromate Plated

Chrome Plated

Galvanized

Hot-Dipped Galvanized

Zinc Yellow-Chromate
Plated

Zinc-Aluminum Coated

	Material Material	Show

Steel

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Stainless Steel

Steel

	System of Measurement System of Measurement

Inch

Metric

Pipe

	Thread Size Thread Size

	Nut Type Nut Type


Hex	Locknut

Flange	Coupling

Cap	Panel

	Hex Nut Profile Hex Nut Profile


Standard	Thin

Extra Wide	Narrow

High	Extra-Wide Thin

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 2	Grade 2H

Grade 5	Grade 8

Grade C	Grade DH

Grade G	Class 8

Class 10

	Thread Direction Thread Direction


Right Hand	Left Hand

	Width Width

	Height Height

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Thread Fit Thread Fit

	Thread Pitch Thread Pitch

	Thread Type Thread Type

	Specifications Met Specifications Met

	Drive Style Drive Style


External Hex	External 12- Point

	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	Distorted Thread

Serrations	Lock Washer

Flex-Top

	Flange Diameter Flange Diameter

	Flange Thickness Flange Thickness

	Length Length

	Threading Threading

	Fully Threaded

	Performance Properties Performance Properties

Rotating

Leveling

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731 Products

About Nuts, Materials, and Finishes

Medium-Strength Steel Hex Nuts—Grade 5

These nuts are suitable for fastening most machinery and equipment.

Metric Medium-Strength Steel Hex Nuts—Class 8

Class 8 nuts are comparable in strength to Class 8.8 bolts and are suitable for fastening most machinery and equipment.

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

High-Strength Steel Hex Nuts—Grade 8

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

Metric High-Strength Steel Hex Nuts—Class 10

About 25% stronger than medium-strength steel nuts, these nuts are comparable in strength to class 10.9 nuts.

Mil. Spec. High-Strength Steel Hex Nuts

Choose these nuts for their adherence to strict military standards for material and construction.

Low-Strength Steel Hex Nuts

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

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

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

These nuts are comparable in strength to Grade 9 bolts.

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.

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 Narrow Hex Nuts

Also known as small-pattern hex nuts, these are about 20% narrower than standard hex nuts for use in tight spaces where standard hex nuts won't fit.

Low-Strength Steel Extra-Wide Thin Hex Nuts

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

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 Steel Nonmarring Locknuts
with Spring-Lock Washer

A conical washer acts as a spring to add tension between the nut and the material surface for easy installation and mild vibration resistance. These metric locknuts have a smooth rim to resist scratching materials when tightened.

Steel Nonmarring Locknuts with Spring-Lock Washer

These locknuts have a curved washer that acts as a spring for easy installation and mild vibration resistance. The smooth rim makes them less likely to scratch materials when tightened than locknuts with a tooth lock washer.

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.

Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Grade 5

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

High-Strength Steel Center-Lock
Distorted-Thread Locknuts—Grade 8

These Grade 8 locknuts are about three times stronger than low-strength steel distorted-thread locknuts.

Steel Flex-Top Locknuts for Heavy Vibration

Threads at the top of these locknuts expand to grip the bolt on all sides for a stronger hold than distorted thread locknuts.

Metric Steel Flex-Top Locknuts for Heavy Vibration

Threads at the top of these metric locknuts expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts.

Flange Nuts

High-Strength Steel Serrated
Flange Locknuts—Grade 8

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

Low-Strength Steel Serrated Flange Locknuts

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

High-Strength Steel Distorted-Thread Flange Locknuts

These flange locknuts are comparable in strength to Grade 8 bolts.

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.

Low-Strength Steel Flange Nuts

About half the strength of medium-strength steel flange nuts, use these nuts in light duty fastening applications, such as securing access panels.

Metric Low-Strength Steel Flange Nuts

About half the strength of medium-strength steel flange nuts, use these metric nuts in light duty fastening applications, such as securing access panels.

Steel High-Torque 12-Point Flange Nuts

These flange nuts have a black-oxide finish for mild corrosion resistance in dry environments.

Rotating Flange Nuts

The nut head rotates while the flange remains stationary to prevent scratching the material surface as you tighten the nut.

Steel Leveling Flange Nuts

These flange nuts have a black-oxide finish for mild corrosion resistance in dry environments.

Steel Coupling Nuts

Metric Medium-Strength Steel Coupling Nuts—Class 8

Choose these locknuts to fasten standard metric threads. They’re Class 8 steel, so they can be used in most fastening applications.

Low-Strength Steel Coupling Nuts

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

Metric Low-Strength Steel Coupling Nuts

For light duty applications, choose these metric-sized coupling nuts.

Steel Extra-Wide High-Hex Cap Nuts

Known for their strength, these steel cap nuts have a black-oxide finish to resist corrosion in dry environments.

Steel Hex Panel Nuts

These steel panel nuts are zinc plated for corrosion resistance.

Thread Adapters

Inch-to-Inch Female Hex Thread Adapters

Connect two differently sized male-threaded parts, such as threaded rods, and tighten with a standard wrench.

Inch-to-Metric Female Hex Thread Adapters

Adapt threaded rods from inch to metric. These adapters connect two male-threaded fasteners, so you can change the gender of a mating part or increase or decrease its thread size. The hex-shaped body fits into the head of a standard wrench.

Metric-to-Metric Female Hex Thread Adapters

Increase or decrease metric thread size from one male-threaded part to another. Commonly used to connect two differently sized threaded rods, they have a hex-shaped body, so you can tighten them with a standard wrench.

Left-Hand to Right-Hand Female Hex Thread Adapters

Often called sleeve nuts, these thread adapters fasten parts with right-hand threads to parts with left-hand threads.

Metric-to-Metric Male Hex Thread Adapters

Twist these adapters onto female metric threads to change pitch or switch thread sizes.

About Nuts, Materials, and Finishes

Hex Nuts

Medium-Strength Steel Hex Nuts—Grade 5

Metric Medium-Strength Steel Hex Nuts—Class 8

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

High-Strength Steel Hex Nuts—Grade 8

Metric High-Strength Steel Hex Nuts—Class 10

Mil. Spec. High-Strength Steel Hex Nuts

Low-Strength Steel Hex Nuts

Low-Strength Steel Thin Hex Nuts

Left-Hand Threaded Low-Strength Steel Thin Hex Nuts

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

Low-Strength Steel Extra-Wide Hex Nuts

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

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

Steel Narrow Hex Nuts

Low-Strength Steel Extra-Wide Thin Hex Nuts

Locknuts

High-Strength Steel Nylon-Insert Locknuts—Grade 8

Metric Steel Nonmarring Locknutswith Spring-Lock Washer

Steel Nonmarring Locknuts with Spring-Lock Washer

High-Strength Steel Top-LockDistorted-Thread Locknuts

Medium-Strength Steel Top-LockDistorted-Thread Locknuts—Grade 5

High-Strength Steel Center-LockDistorted-Thread Locknuts—Grade 8

Steel Flex-Top Locknuts for Heavy Vibration

Metric Steel Flex-Top Locknuts for Heavy Vibration

Flange Nuts

High-Strength Steel SerratedFlange Locknuts—Grade 8

Low-Strength Steel Serrated Flange Locknuts

High-Strength Steel Distorted-Thread Flange Locknuts

Metric High-Strength Steel Flange Nuts—Class 10

Low-Strength Steel Flange Nuts

Metric Low-Strength Steel Flange Nuts

Steel High-Torque 12-Point Flange Nuts

Rotating Flange Nuts

Steel Leveling Flange Nuts

Steel Coupling Nuts

Metric Medium-Strength Steel Coupling Nuts—Class 8

Low-Strength Steel Coupling Nuts

Metric Low-Strength Steel Coupling Nuts

Steel Extra-Wide High-Hex Cap Nuts

Steel Extra-Wide High-Hex Cap Nuts

Steel Hex Panel Nuts

Steel Hex Panel Nuts

Thread Adapters

Inch-to-Inch Female Hex Thread Adapters

Inch-to-Metric Female Hex Thread Adapters

Metric-to-Metric Female Hex Thread Adapters

Left-Hand to Right-Hand Female Hex Thread Adapters

Metric-to-Metric Male Hex Thread Adapters

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

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

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

Metric Steel Nonmarring Locknuts
with Spring-Lock Washer

High-Strength Steel Top-Lock
Distorted-Thread Locknuts

Medium-Strength Steel Top-Lock
Distorted-Thread Locknuts—Grade 5

High-Strength Steel Center-Lock
Distorted-Thread Locknuts—Grade 8

High-Strength Steel Serrated
Flange Locknuts—Grade 8