Square Keys | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Width Width

	Length Length

	Height Height

	Material Material

	Key Type Key Type


Straight	Rounded

Woodruff

	Tolerance Rating Tolerance Rating

Undersized

Oversized

Standard

	Minimum Hardness Minimum Hardness

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	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.

	Finish Finish

Zinc Plated

Gold Dichromate Plated

	Number of Pieces Number of Pieces

300

401

	Container Type Container Type

Plastic Box

Cardboard 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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1,352 Products

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.

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.