SAE Carriage Bolts | McMaster-Carr

Clear All

	Specifications Met Specifications Met

ASME

SAE

ASTM

	Thread Type Thread Type

UNC

UNF

	System of Measurement System of Measurement

Inch

	Thread Size Thread Size

	Length Length

	Finish Finish

Zinc Plated

Black Oxide

Zinc Yellow-Chromate Plated

Zinc-Aluminum Coated

	Material Material

Steel

Stainless Steel

	Neck Type Neck Type


Square	Knurled

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 2	Grade 5

Grade 8

	Threading Threading

	Fully Threaded
	Partially Threaded

	Neck Width Neck Width

	Head Diameter Head Diameter

	Neck Length Neck Length

	Head Height Head Height

	Tensile Strength Tensile Strength

	Thread Spacing Thread Spacing

Coarse

Fine

	Thread Fit Thread Fit

Class 2A

Class 3A

	Hardness Hardness

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

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

	Minimum Thread Length Minimum Thread Length

	Neck Diameter Neck Diameter

408 Products

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.

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.

About Hex Head Screws and Bolts

Carriage Bolts

Medium-Strength Grade 5 SteelSquare-Neck Carriage Bolts