Structural Bolts | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Length Length

	Fastener Strength Grade/Class Fastener Strength Grade/Class

	Head Type Head Type


Hex	Rounded

	Material Material

Steel

Stainless Steel

Bronze

	Finish Finish

Hot-Dipped Galvanized

Zinc Plated

Black Oxide

Zinc Yellow-Chromate Plated

Black Zinc Plated

Zinc-Aluminum Coated

	Threading Threading

	Partially Threaded
	Fully Threaded

	Grip Length Grip Length

	Head Width Head Width

	Specifications Met Specifications Met

	Minimum Thread Length Minimum Thread Length

	Thread Fit Thread Fit

	Thread Type Thread Type

UNC

UNF

Metric

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

DFARS Specialty Metals
Compliant

DFARS Specialty Metals
COTS-Exempt

	Tensile Strength Tensile Strength

	Head Height Head Height

	Thread Spacing Thread Spacing

Coarse

Fine

	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

	Hardness Hardness

	Screw Size Screw Size

	Neck Type Neck Type


Square	Knurled

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About Hex Head Screws and Bolts

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.

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.

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.

Carriage Bolts

Medium-Strength Grade 5 Steel
Square-Neck Carriage Bolts

Twice as strong as low-strength steel bolts, these bolts are suitable for fastening most machinery and equipment. Carriage bolts have a smooth, rounded head for a finished look. The square neck keeps these bolts from turning when tightening a nut.

Medium-Strength Metric Class 8.8
Steel Square-Neck Carriage Bolts

Choose these metric bolts for fastening most machinery and equipment. They are twice as strong as low-strength steel bolts. Carriage bolts have a smooth, rounded head for a finished look. The square neck keeps these bolts from turning when tightening a nut.

Low-Strength Steel Square-Neck Carriage Bolts

About half the strength of medium-strength bolts, these Grade 2 bolts are for light duty fastening. Carriage bolts have a smooth, rounded head for a finished look. The square neck keeps these bolts from turning when tightening a nut.

High-Strength Grade 8 Steel
Square-Neck Carriage Bolts

Made from Grade 8 steel, these bolts can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. Carriage bolts have a smooth, rounded head for a finished look. The square neck keeps these bolts from turning when tightening a nut.

18-8 Stainless Steel Square-Neck Carriage Bolts

These bolts have good chemical resistance. Carriage bolts have a smooth, rounded head for a finished look. The square neck keeps these bolts from turning when tightening a nut.

Super-Corrosion-Resistant 316 Stainless
Steel Square-Neck Carriage Bolts

More corrosion resistant than 18-8 stainless steel bolts, these bolts have excellent resistance to chemicals and salt water. Carriage bolts have a smooth, rounded head for a finished look. The square neck keeps these bolts from turning when tightening a nut.

Bronze Square-Neck Carriage Bolts

Bronze bolts are resistant to salt water, electrically conductive, and nonmagnetic. Carriage bolts have a smooth, rounded head for a finished look. The square neck keeps these bolts from turning when tightening a nut.

Medium-Strength Grade 5 Steel
Knurled-Neck Carriage Bolts

These bolts are suitable for fastening most machinery and equipment. Carriage bolts have a smooth, rounded head for a finished look. The knurled neck grips the inside of the hole to keep these bolts from turning when tightening a nut.

Low-Strength Steel Knurled-Neck Carriage Bolts

About half the strength of medium-strength bolts, these bolts are for light duty fastening. Carriage bolts have a smooth, rounded head for a finished look. The knurled neck grips the inside of the hole to keep these bolts from turning when tightening a nut.

Screws for Wood

Steel Hex Head Screws for Wood

These steel screws have corrosion-resistant finishes.

Metric Steel Hex Head Screws for Wood

Drive the pointed tip of these screws into soft material, such as wood and drywall. They are also known as lag bolts.

Super-Corrosion-Resistant 316 Stainless
Steel Hex Head Screws for Wood

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

18-8 Stainless Steel Hex Head Screws for Wood

18-8 stainless steel screws have good chemical resistance.

Steel Flanged Hex Head Screws for Wood

These steel screws are hot-dipped galvanized to resist corrosion in wet environments.

Stainless Steel Flanged Hex Head Screws for Wood

These 316 stainless steel screws have excellent resistance to chemicals and salt water.

About Hex Head Screws and Bolts

Heavy Hex Head Screws for Structural Applications

Medium-Strength Steel Heavy HexHead Screws for Structural Applications

High-Strength Steel Heavy Hex HeadScrews for Structural Applications

Metric High-Strength Steel Heavy HexHead Screws for Structural Applications