ASME Specialty Bolts | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Length Length

	Material Material

Steel

Stainless Steel

Bronze

	Finish Finish

Zinc Plated

Hot-Dipped Galvanized

Zinc Yellow-Chromate Plated

Black Oxide

Zinc-Aluminum Coated

Black Phosphate

	Head Type Head Type


Rounded	Hex

Square	Flat

Eye

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 2	Grade 5

Grade 8	Grade A325

Class 10.9

	Threading Threading

	Fully Threaded
	Partially Threaded

	Head Height Head Height

	Specifications Met Specifications Met

	Thread Spacing Thread Spacing

Coarse

Fine

	Tensile Strength Tensile Strength

	Thread Type Thread Type

UNC

UNF

Metric

	Thread Fit Thread Fit

	Head Diameter Head Diameter

	Hardness Hardness

	Neck Width Neck Width

	Head Width Head Width

	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

	Neck Length Neck Length

	Drive Style Drive Style


External Hex	External Square	Slotted

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

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About Hex Head Screws and 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.

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 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.

Steel Wire-Lockable Hex Head Screws

These Grade 5 steel screws are over 70% stronger than our stainless steel wire-lockable hex head screws. Wire these screws together through the hole in the head to get more vibration resistance than any other screw.

Stainless Steel Wire-Lockable Hex Head Screws

Made from 18-8 stainless steel, these screws have the best chemical and corrosion resistance of our wire-lockable screws. Wire these screws together for more vibration resistance than other types of hex head screws.

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.

Stainless Steel Flanged Hex
Head Screws with Slotted Drive

Install these screws with a wrench or a screwdriver. Made from stainless steel, they have good corrosion resistance. A flange under the head means a separate washer is not necessary.

High-Strength Metric Class 10.9
Steel Flanged Hex Head Screws

These metric screws are at least 25% stronger than medium-strength steel screws. Use them in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. The flange distributes pressure where the screw meets the surface, so there's no need for a washer.

Medium-Strength Grade 5 Steel Square Head Screws

Made from Grade 5 steel, these screws are suitable for fastening most machinery and equipment. Large flat sides make these screws easy to grip with a wrench and keep them from rotating in square holes.

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.

Wood Screw-Style Hangers

Drive these hangers into wood with an adjustable wrench, pliers, or a special driver bit.

Toggle Bolt-Style Hangers

These hangers are a popular choice for overhead applications.

Toggle Bolt-Style Hangers with Spring

The spring holds the washer and toggle against opposite sides of the wall, so everything's in position before you begin tightening. Once tightened, the spring adds vibration resistance.

Square-Neck Flat Head Plow Bolts

Used on heavy equipment, such as plows, these bolts have a smooth head that's angled underneath to sit flush within countersunk holes. The square neck keeps these bolts from turning when tightening a nut.