9/16"-12 Nuts | McMaster-Carr

	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

	Specifications Met Specifications Met

	Flange Diameter Flange Diameter

31/32"

1 3/16"

	Insert Maximum Temperature Insert Maximum Temperature

220° F

	Length Length

2 1/8"

	Flange Thickness Flange Thickness

62 Products

About Nuts, Materials, and Finishes

Medium-Strength Steel Hex Nuts—Grade 5

These nuts are suitable for fastening most machinery and equipment.

Mil. Spec. Medium-Strength Steel Hex Nuts

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

High-Strength Steel Hex Nuts—Grade 8

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

Left-Hand Threaded High-Strength Steel Hex Nuts

Tighten these nuts by turning them to the left; once fastened, they resist loosening from counterclockwise motion.

Low-Strength Steel Hex Nuts

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

18-8 Stainless Steel Hex Nuts

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

Super-Corrosion-Resistant 316 Stainless Steel Hex Nuts

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

Brass Hex Nuts

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

Aluminum Hex Nuts

One-third the weight of steel, these aluminum nuts are corrosion resistant in wet environments and nonmagnetic.

Thin Hex Nuts

Medium-Strength Steel Thin Hex Nuts

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

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.

Brass Thin Hex Nuts

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

Extra-Wide Hex Nuts

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.

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.

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.

Medium-Strength Steel Nylon-Insert Locknuts—Grade 5

Made from Grade 5 steel, these inch-sized locknuts are suitable for fastening most machinery and equipment.

Low-Strength Steel Nylon-Insert Locknuts

Made from low-strength steel, these locknuts should be used for light duty fastening applications, such as securing.access panels.

18-8 Stainless Steel Nylon-Insert Locknuts

These locknuts have good chemical resistance.

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

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

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.

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.

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.

Medium-Strength Steel Locknuts
for use with Cotter Pins—Grade 5

Also known as castle nuts, secure these nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance.

Low-Strength Steel Locknuts for use with Cotter Pins

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

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.

Steel High-Torque 12-Point Flange Nuts

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

Coupling Nuts

Low-Strength Steel Coupling Nuts

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

18-8 Stainless Steel Coupling Nuts

These coupling nuts have good chemical resistance.

Brass Coupling Nuts

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

Stainless Steel Extra-Long Coupling Nuts

Stainless steel coupling nuts have excellent corrosion resistance in most environments.

Cap Nuts

18-8 Stainless Steel Cap Nuts

These cap nuts have good chemical resistance and may be mildly magnetic.

Super-Corrosion-Resistant
316 Stainless Steel Cap Nuts

These cap nuts have excellent resistance to chemicals and salt water.

Low-Strength Steel Cap Nuts

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