Square Pins | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	Width Width

	Length Length

	Diameter Diameter

	Material Material

	Key Type Key Type


Straight	Rounded

	Height Height

	Tolerance Rating Tolerance Rating

Undersized

Oversized

Standard

	Minimum Hardness Minimum Hardness

	Usable Length Usable Length

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Specifications Met Specifications Met

	Finish Finish

Zinc Plated

Gold Dichromate Plated

Black

	Retainer Clearance Retainer Clearance

	Retainer Closure Retainer Closure

Loop

Hook

Loop with Easy-Release Tab

	Number of Pieces Number of Pieces

300

	Thread Size Thread Size

	Thread Pitch Thread Pitch

0.5 mm

0.7 mm

0.8 mm

	Container Type Container Type

Plastic Box

Cardboard Box

Cardboard Tube

	Container Features Container Features

Compartmented

Lid Chart

	Color Color

	Off-White
	Beige
	White

	Rounded Keys Included Rounded Keys Included

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1,135 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.

Wire-Lock Clevis Pins

The wire retainer snaps closed to secure the pin for a one-piece alternative to a clevis and cotter pin combination. Also known as PTO pins.

Machine Key Assortments

Oversized Machine Key Assortments

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

Standard Key Stock Assortments

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

Undersized Machine Key Assortments

These keys are slightly undersized to fit in standard keyways.