Square Keys | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Width Width

	Length Length

	Material Material

	Finish Finish

Zinc Plated

Gold Dichromate Plated

	Key Type Key Type


Straight	Rounded

	Height Height

	Tolerance Rating Tolerance Rating

Undersized

Oversized

Standard

	Minimum Hardness Minimum Hardness

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Specifications Met Specifications Met

ANSI

DIN

Mil. Spec.

	Number of Pieces Number of Pieces

300

	Container Type Container Type

Cardboard Box

Plastic Box

Cardboard Tube

	Container Features Container Features

Compartmented

Lid Chart

	Thread Size Thread Size

	Thread Pitch Thread Pitch

0.5 mm

0.7 mm

0.8 mm

	Color Color

	Off-White
	Beige
	White

	Rounded Keys Included Rounded Keys Included

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1,059 Products

Fasteners

Machine Key Stock

Cut this stock to length to create the machine key you need. Straight keys, with a square or rectangular cross section, are the most common type of key. Install in a keyway to transmit torque from shafts to gears and other components.

Machine Keys

Straight keys, with a square or rectangular cross section, are the most common type of key. Install them in keyways to transmit torque from shafts to gears and other components.

Rounded Machine Keys

When installed, these keys fill oval keyways completely, reducing stress on the key and shaft. The rounded ends make it easy to slide gears, hubs, and other components into place. These are also known as feather keys.

Tapped Rounded Machine Keys

Thread a screw through the tapped hole to pop these keys out of a keyway. When installed, they fill oval keyways completely, reducing stress on the key and shaft. The rounded ends make it easy to slide gears, hubs, and other components into place.

Standard Key Stock Assortments

These assortments include various sizes of key stock—choose a piece and cut it to your desired length.

Oversized Machine Key Assortments

Slightly larger than the size listed, these oversized keys offer a tight fit in worn keyways.

Undersized Machine Key Assortments

These keys are slightly undersized to fit in standard keyways.

Oversized Key Stock Assortments

Make a key that is the exact length you need. Slightly larger than the size listed, these oversized keys offer a tight fit in worn keyways.