Steel Hex Flange Nuts | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Nut Type Nut Type


Flange	Hex

Locknut

	Finish Finish

Zinc Plated

Black Oxide

Black Phosphate

Zinc Yellow-Chromate Plated

Black Ultra-Corrosion-
Resistant Coated

Cadmium Yellow-Chromate
Plated

Zinc-Aluminum Coated

Phosphate Coated

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 5	Grade 8

Grade F	Grade G

Class 8	Class 10

	Width Width

	Locking Type Locking Type


Serrations	Distorted Thread

Nylon Insert

	Flange Diameter Flange Diameter

	Hex Nut Profile Hex Nut Profile


Standard	High

	Height Height

	Flange Thickness Flange Thickness

	Drive Style Drive Style


External Hex	External 12- Point

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Thread Type Thread Type

	Thread Fit Thread Fit

	Specifications Met Specifications Met

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Performance Properties Performance Properties

Rotating

Leveling

	Washer Thickness Washer Thickness

	Maximum Correction Maximum Correction

1°

1 1/2°

2 1/2°

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478 Products

About Nuts, Materials, and Finishes

High-Strength Steel Serrated
Flange Locknuts—Grade 8

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

Metric High-Strength Steel Serrated
Flange Locknuts—Class 10

They're about 25% stronger than medium-strength steel flange locknuts and comparable in strength to Class 10.9 bolts.

Medium-Strength Steel Serrated
Flange Locknuts—Grade 5

These flange locknuts have serrations that grip the material surface instead of the threads for easy installation and mild vibration resistance.

Metric Medium-Strength Steel
Serrated Flange Locknuts—Class 8

Strong enough for use in most machinery and equipment, these medium-strength metric nuts have serrations on the underside of the flange. The serrations prevent the nuts from loosening in applications with mild vibration.

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 Distorted-Thread
Flange Locknuts—Class 10

Grip metric bolts more securely than nylon-insert flange locknuts—the irregularly shaped threads on these locknuts hold extra tight. They resist vibration and sudden shocks, even after multiple uses.

Mil. Spec. Low-Strength Steel
Distorted-Thread Flange Locknuts

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

Medium-Strength Steel Nylon-Insert
Flange Locknuts—Grade F

Grade F nuts are comparable in strength to Grade 5 bolts.

Metric Medium-Strength Steel
Nylon-Insert Flange Locknuts—Class 8

Metric High-Strength Steel Nylon-Insert
Flange Locknuts—Class 10

High-Strength Steel Nylon-Insert
Flange Locknuts—Grade G

Grade G nuts are comparable in strength to Grade 8 bolts.

Steel Flange Nuts

High-Strength Steel Flange Nuts—Grade 8

Made from Grade 8 steel, these nuts are about 25% stronger than medium-strength steel flange nuts.

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.

JIS High-Strength Steel Flange Nuts

These metric nuts meet JIS (Japanese Industrial Standard) B 1190.

Medium-Strength Steel Flange Nuts

These Grade 5 flange nuts are suitable for fastening most machinery and equipment.

Metric Medium-Strength Steel Flange Nuts—Class 8

No need for a washer—these metric medium-strength steel nuts have a flange that distributes pressure across its surface the way a washer does. Made of medium-strength, Class 8 steel, they’re suitable for fastening most machinery and equipment.

JIS Medium-Strength Steel Flange Nuts

Made to Japanese Industrial Standards, these nuts fasten most Japanese machinery and equipment without a washer.

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 Leveling 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 High-Torque 12-Point Flange Nuts

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

About Nuts, Materials, and Finishes

Flange Locknuts

High-Strength Steel SerratedFlange Locknuts—Grade 8

Metric High-Strength Steel SerratedFlange Locknuts—Class 10

Medium-Strength Steel SerratedFlange Locknuts—Grade 5

Metric Medium-Strength SteelSerrated Flange Locknuts—Class 8

Low-Strength Steel Serrated Flange Locknuts

High-Strength Steel Distorted-Thread Flange Locknuts

Metric High-Strength Steel Distorted-ThreadFlange Locknuts—Class 10

Mil. Spec. Low-Strength SteelDistorted-Thread Flange Locknuts

Medium-Strength Steel Nylon-InsertFlange Locknuts—Grade F

Metric Medium-Strength SteelNylon-Insert Flange Locknuts—Class 8

Metric High-Strength Steel Nylon-InsertFlange Locknuts—Class 10

High-Strength Steel Nylon-InsertFlange Locknuts—Grade G