Low-Profile Hex Nuts | McMaster-Carr

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	Hex Nut Profile Hex Nut Profile


Thin	Extra-Wide Thin

	Cap Nut Profile Cap Nut Profile

	Low

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Material Material

	Finish Finish

Cadmium Yellow-Chromate
Plated

Corrosion-Resistant-Coated

Nickel Plated

Zinc Plated

Zinc Yellow-Chromate Plated

Zinc-Flake Coated

	Height Height

	Width Width

	Nut Type Nut Type


Cap	Hex

Locknut	Panel

	Thread Direction Thread Direction


Right Hand	Left Hand

	Specifications Met Specifications Met

	Thread Spacing Thread Spacing

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Thread Type Thread Type

	Pipe Size Pipe Size

	Thread Fit Thread Fit

Class 2B

Class 6H

Class 3B

	Drive Style Drive Style

	External Hex

	Locking Type Locking Type


Nylon Insert	Flex-Top

Steel Insert

	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

1,313 Products

About Nuts, Materials, and Finishes

Medium-Strength Steel Thin Hex Nuts

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

Metric Medium-Strength Steel Thin Hex Nuts

Half as thick as regular hex nuts, these nuts fit into spaces with low height clearances. They are about half as strong as medium-strength steel, and are often used for light duty applications, such as securing access panels.

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.

Left-Hand Threaded
Medium-Strength Steel Thin Hex Nuts

These nuts tighten when turned to the left; once fastened, they resist loosening from counterclockwise motion. They’re Grade 5 steel, so you can used these inch-sized nuts for most 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. Made of Grade 2 and Class 04 steel, these nuts 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 18-8 Stainless Steel Thin Hex Nuts

Useful in low-clearance applications, these metric nuts are roughly half the height of standard hex nuts, but aren’t as strong. All are 18-8 stainless steel, which is nearly as strong as steel but won’t rust in outdoor, washdown, and other corrosive environments.

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.

Mil. Spec. 18-8 Stainless Steel Thin Hex Nuts

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

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.

Super-Corrosion-Resistant 316
Stainless Steel Thin Hex Nuts

These nuts have excellent chemical resistance and can be used in saltwater environments.

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.

Brass Thin Hex Nuts

These nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic.

Metric Brass Thin Hex Nuts

Made from brass, these metric nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. About half the height of standard hex nuts, they are useful in low-clearance applications but have less tensile strength.

Left-Hand Threaded Brass Thin Hex Nuts

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

Plastic Thin Hex Nuts

Plastic nuts are chemical resistant, nonconductive, and lightweight.

Aluminum Thin Hex Nuts

One-third the weight of steel, aluminum nuts resist corrosion in wet environments.

Bronze Thin Hex Nuts

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

Titanium Thin Hex Nuts

Titanium nuts have a high strength-to-weight ratio and are resistant to acids and salt water.

Extra-Wide Thin Hex Nuts

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.

Low-Strength Steel Extra-Wide Thin Hex Nuts

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

Stainless Steel Extra-Wide Thin Hex Nuts

Stainless steel nuts have excellent corrosion resistance in most environments.

Brass Extra-Wide Thin Hex Nuts

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

Locknuts

Low-Strength Steel Thin Nylon-Insert Locknuts

These locknuts are about half the height of standard nylon-insert locknuts. Use them in light duty low clearance applications or jam one against a hex nut to hold it in place.

Mil. Spec. Low-Strength Steel
Thin Nylon-Insert Locknuts

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

High-Strength Steel Thin Nylon-Insert Locknuts

These Grade 8 locknuts are about 25% stronger than medium-strength steel thin locknuts.

Medium-Strength Steel Thin Nylon-Insert Locknuts

Grade 5 locknuts are suitable for fastening most machinery and equipment when used in conjunction with a standard hex nut.

18-8 Stainless Steel Thin Nylon-Insert Locknuts

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

Mil. Spec. 18-8 Stainless Steel
Thin Nylon-Insert Locknuts

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

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

More corrosion resistant than 18-8 stainless steel locknuts, these 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.

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

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

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

These locknuts have good chemical resistance.

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

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

Stainless Steel Thin Flex-Top
Locknuts for Heavy Vibration

Stainless steel locknuts have excellent corrosion resistance in most environments.

Steel Thin 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.

Thin Steel-Insert Locknuts for Extreme Vibration

About two-thirds the height of standard steel-insert locknuts, use these locknuts in low-clearance applications or jam one against a hex nut to hold it in place.

Cap Nuts

Sanitary Low-Profile Cap Nuts

Certified by EHEDG (European Hygienic Engineering and Design Group) to meet sanitary design standards, these cap nuts fit into tight spaces to cover and seal exposed threads in your food processing facility.

Low-Profile Cap Nuts

Low-profile cap nuts are about 20% shorter than standard cap nuts for use in low-profile applications.

Hex 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.