ASME Pins | McMaster-Carr

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	Specifications Met Specifications Met

ANSI

ASME

	System of Measurement System of Measurement

Inch

Metric

	Diameter Diameter

	Length Length

	Material Material

1008-1045 Carbon Steel

	End Shape End Shape


Chamfered	Rounded

	Pin Type Pin Type

	Dowel
	Cotter
	Spring
	Taper

	Shaft Type Shaft Type


Plain	Slotted

Grooved	Coiled

Tapered	D-Profile

Spiral

	Head Type Head Type


Plain	Rounded

Tapped	Threaded

	Tolerance Rating Tolerance Rating

Standard

Undersized

Oversized

	Minimum Hardness Minimum Hardness

	End Type End Type

	Plain

	Breaking Strength Breaking Strength

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	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

	For Hole Diameter For Hole Diameter

	Finish Finish

Black Oxide

Zinc Plated

	Cotter Pin Type Cotter Pin Type

	Standard
	Hammer Set
	Wedge Lock

	Passivation Passivation

Not Passivated

Passivated

	Thread Size Thread Size

4-40
6-32
8-32
10-24
10-32
1/4"-20
5/16"-18
3/8"-16
1/2"-13
3/4"-16
7/8"-14
1 1/8"-12

	Wall Thickness Wall Thickness

	Head Diameter Head Diameter

2,978 Products

Pins

Dowel Pins

Use these metal dowel pins as pivots, hinges, shafts, jigs, and fixtures to locate or hold parts.

Undersized Dowel Pins

Slip these pins in and out during maintenance or prototyping—they’re undersized to make alignment easier.

Pull-Out Dowel Pins

To remove these pins, thread a screw or tool into the tapped hole, then pull them out.

Flat-Vent Pull-Out Dowel Pins

The flat side of these pins relieves trapped air, making them easier to insert in and remove from blind holes. To remove, thread a screw or tool into the tapped hole, then pull the pin out.

Spiral-Vent Pull-Out Dowel Pins

A spiral groove cut into these pins relieves trapped air but stays in 360° contact with the hole for a secure fit that's easy to insert in and remove from blind holes. To remove, thread a screw or tool into the tapped hole, then pull the pin out.

Round Head Full-Groove Dowel Pins

Grooves hold these pins in place, and a round head gives them a finished appearance.

Cotter Pins

Also known as split pins, these have one prong slightly longer than the other so they’re easy to open. Bend prongs outward to secure.

Hammer-Set Cotter Pins

For parts that spin or are otherwise difficult to access, slide these pins in and tap them with a hammer for a temporary hold. Reposition work, then bend the prongs outward to secure.

Wedge-Lock Cotter Pins

Slide these heavy duty pins into the through-hole in a clevis pin, then hit them with a hammer to wedge the prongs open.

Slotted Spring Pins

Also known as roll, tension, split, and expansion pins, these pins have a slot along one side that you squeeze closed to install them into unthreaded holes.

Coiled Spring Pins

These spiral pins remain flexible after installation, so they absorb shock and vibration better than slotted spring pins. They work well in holes that are out of round.

Heavy Duty Coiled Spring Pins

For tough jobs, these spiral pins are 30% stronger than our standard coiled spring pins. They remain flexible after installation to absorb shock and vibration, and work well in holes that are out of round.

Threaded Taper Pins

Threads on these pins stick out for easy removal from blind holes. Tighten the hex nut to draw the pin out.

Taper Pins

To remove these pins, hit the small end with a punch to drive the pin out.

Tapped Taper Pins

These internally threaded pins sit flush in an assembly. For easy removal from a blind hole, thread a screw into the pin and pull out.

Cotter Pin Assortments

Also known as split pins, these have one prong slightly longer than the other so they’re easy to open.

Machine Keys

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.

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.

Woodruff Keys

Woodruff keys work well near shaft shoulders and on tapered shafts. These keys have a rounded shape that makes them easy to remove when parts need to be taken apart frequently. Use them in light duty applications to connect gears and other components to shafts. Also known as half moon 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.

Tapered Gib Keys

These keys have a tapered body that wedges in to the keyway for a more secure fit than standard machine keys. The gib head makes them easy to remove when parts need to be taken apart frequently, such as for maintenance or prototyping.

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.