Grade 8 Cap Screws | McMaster-Carr

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	Fastener Strength Grade/Class Fastener Strength Grade/Class	Show

Grade 8

	Fastener Strength Grade/Class Fastener Strength Grade/Class	Hide

	System of Measurement System of Measurement

Inch

	Thread Size Thread Size

	Length Length

	Head Type Head Type


Hex	Square

	Threading Threading

	Fully Threaded
	Partially Threaded

	Finish Finish

Black Oxide

Black Phosphate

Zinc Plated

Zinc Yellow-Chromate Plated

Zinc-Aluminum Coated

	Material Material

Steel

	Thread Direction Thread Direction


Right Hand	Left Hand

	Head Width Head Width

	Thread Spacing Thread Spacing

Coarse

Fine

Extra Fine

	Head Height Head Height

	Drive Style Drive Style


External Hex	External Square

	Thread Type Thread Type

	Thread Fit Thread Fit

Class 2A

Class 3A

	Tensile Strength Tensile Strength

100,000 psi or greater

	Minimum Thread Length Minimum Thread Length

	Specifications Met Specifications Met

	Hardness Hardness

Rockwell C32

Rockwell C33

Not Rated

	Screw Features Screw Features


Flanged	Tension Indicating

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

DFARS Specialty Metals
Compliant

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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About Hex Head Screws and Bolts

High-Strength Grade 8 Steel Hex Head Screws

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws.

High-Strength Steel Hex Head
Screws with Material Certification

These screws come with a traceable lot number and a physical and chemical test report. Use them for high-strength fastening.

Mil. Spec. High-Strength Steel Hex Head Screws

Choose these screws for their adherence to strict military standards for material and construction. Their high tensile strength means they can be used in demanding, high-stress applications.

Left-Hand Threaded High-Strength
Steel Hex Head Screws

Tighten these screws by turning them to the left; once fastened, they prevent counterclockwise-moving parts from loosening. For use in high-strength fastening applications.

High-Strength Grade 8 Steel Flanged Hex Head Screws

High-Strength Grade 8 Steel
Serrated-Flange Hex Head Screws

About 20% stronger than medium-strength steel screws, these Grade 8 steel screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. Serrations under the flange provide mild vibration resistance.

High-Strength Grade 8 Steel
Thread-Locking Hex Head Screws

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are more than twice as strong as our stainless steel thread-locking screws. The thread locker helps resist loosening from vibration.

Tension-Indicating Hex Head Screws

An indicator dot changes from red to black when the screw is properly tightened. If it comes loose, the dot changes back to red.

High-Strength Grade 8 Steel Square Head Screws

Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. Large flat sides make these screws easy to grip with a wrench and keep them from rotating in square holes.

Hex Head Screw Assortments

These assortments include hex head screws and hex nuts.

About Hex Head Screws and Bolts

Screws and Bolts

High-Strength Grade 8 Steel Hex Head Screws

High-Strength Steel Hex HeadScrews with Material Certification

Mil. Spec. High-Strength Steel Hex Head Screws

Left-Hand Threaded High-StrengthSteel Hex Head Screws

High-Strength Grade 8 Steel Flanged Hex Head Screws

High-Strength Grade 8 SteelSerrated-Flange Hex Head Screws

High-Strength Grade 8 SteelThread-Locking Hex Head Screws

Tension-Indicating Hex Head Screws

High-Strength Grade 8 Steel Square Head Screws

Hex Head Screw Assortments

Hex Head Screw Assortments

High-Strength Steel Hex Head
Screws with Material Certification

Left-Hand Threaded High-Strength
Steel Hex Head Screws

High-Strength Grade 8 Steel
Serrated-Flange Hex Head Screws

High-Strength Grade 8 Steel
Thread-Locking Hex Head Screws