Heavy Hex Head Bolts | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Type Thread Type

UNC

Metric

	Length Length

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Material Material

Steel

Stainless Steel

	Threading Threading

	Partially Threaded
	Fully Threaded

	Grip Length Grip Length

	Head Width Head Width

	Specifications Met Specifications Met

	Thread Length Thread Length

	Thread Fit Thread Fit

Class 2A

Class 6g

	Tensile Strength Tensile Strength

	Head Height Head Height

	Hardness Hardness

	Thread Pitch Thread Pitch

	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

18-8 Stainless Steel Heavy Hex Head
Screws for High-Pressure Applications

These Grade B8 screws are made from 18-8 stainless steel and have good chemical resistance. Also known as pressure bolts, they meet the high-pressure and high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges.

Super-Corrosion-Resistant 316 Stainless Steel Heavy
Hex Head Screws for High-Pressure Applications

Made from 316 stainless steel, these Grade B8M screws are more corrosion resistant than 18-8 stainless steel screws and have excellent resistance to chemicals and salt water. Screws meet ASTM A193 regulations, so they can be used in high-pressure and high-temperature applications. Also known as pressure bolts.

Steel Heavy Hex Head Screws
for High-Pressure Applications

These Grade B7 steel screws are nearly twice as strong as our stainless steel screws for high-pressure applications. Also known as pressure bolts, they meet the high-pressure, high-temperature regulations of ASTM A193 and are used to secure pressure tanks, valves, and flanges.

Medium-Strength Steel Heavy Hex
Head Screws for Structural Applications

The most common heavy hex head screw, these steel screws meet ASTM A325 regulations for structural joints, such as mating I-beams and scaffolding.

Metric High-Strength Steel Heavy Hex
Head Screws for Structural Applications

Designed for construction and exterior building applications, these metric screws are often used to join I-beams and scaffolding. Their partial threading leaves an unthreaded portion that is strong enough to stand up to the sideways forces of joints.

High-Strength Steel Heavy Hex Head
Screws for Structural Applications

50% stronger than our medium-strength steel heavy hex head screws, these screws meet ASTM A490 specifications for structural applications. Use them in joints that require more tensile strength than ASTM A325 screws.

About Hex Head Screws and Bolts

Heavy Hex Head Screws

18-8 Stainless Steel Heavy Hex HeadScrews for High-Pressure Applications

Super-Corrosion-Resistant 316 Stainless Steel HeavyHex Head Screws for High-Pressure Applications

Steel Heavy Hex Head Screwsfor High-Pressure Applications

Medium-Strength Steel Heavy HexHead Screws for Structural Applications