McMaster-Carr

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	Thread Size Thread Size

M3.5

M10

M12

M16

M20

	Thread Pitch Thread Pitch

	Head Type Head Type


12-Point	Rounded

Flat	Hex

Thumb

	Threading Threading

	Fully Threaded
	Partially Threaded

	Length Length

	Material Material

Steel

Stainless Steel

	Finish Finish

Black Oxide

Zinc Plated

Zinc Yellow-Chromate Plated

	Head Width Head Width

	Head Height Head Height

	Drive Size Drive Size

	Drive Style Drive Style


External 12-Point	External Hex	Phillips

	Tensile Strength Tensile Strength

	Head Diameter Head Diameter

	Fastener Strength Grade/Class Fastener Strength Grade/Class


Grade 2	Class 8.8

	Flange Diameter Flange Diameter

	Neck Length Neck Length

	Thread Fit Thread Fit

Class 4h

Class 6g

Class 8g

	Shoulder Diameter Shoulder Diameter

	Specifications Met Specifications Met

SAE

ISO

DIN

	Screw Size Screw Size

M10

M12

M16

	Hardness Hardness

	Neck Width Neck Width

	Shoulder Length Shoulder Length

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258 Products

Screws and Bolts

Alloy Steel 12-Point Screws

Good for high-strength fastening, these screws are made from alloy steel comparable in strength to Grade 9 steel. The head makes 12 points of contact with a wrench to handle more torque than a socket head or hex head screw.

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.

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.

Low-Strength Steel
Square-Neck Elevator Bolts

About half the strength of medium-strength bolts, these Grade 2 bolts are for light duty fastening. These bolts are commonly used in tight spaces with moving parts, such as grain elevators and other belting systems, because the smooth, low-profile head provides a flush fit when installed. The square neck keeps these bolts from turning when tightening a nut.

Metric Steel Hex Head
Shoulder Screws

Also known as wheel and axle bolts, these metric screws have an unthreaded shoulder that acts as a shaft, so material attached to the threaded end can rotate.