Alignment Dowels | McMaster-Carr

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

REACH Compliant

	Breaking Strength Breaking Strength

	Specifications Met Specifications Met

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

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Thread Size Thread Size

	Passivation Passivation

Not Passivated

Passivated

	Mount Type Mount Type


Press Fit	Screw

Threaded Stud	Threaded Body

	Large End Diameter Large End Diameter

	Small End Diameter Small End Diameter

	Head Style Head Style

	Head Diameter Head Diameter

	Pin Number Pin Number

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6,048 Products

Pins

Dowel Pins

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

Plastic Dowel Pins

Plastic pins are a nonconductive and nonmagnetic alternative to metal dowel pins. Use them 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.

Oversized Dowel Pins

Oversized to fit worn and enlarged holes, these pins work well as repair and replacement parts.

Dowel Pin Stock

Cut this 12" stock to the length you need.

Hollow Dowel Pins

Pass wires and other components through these hollow pins.

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.

Wood Dowel Pins

Join two pieces of wood with these dowel pins. When glued, they expand for a tight fit.

Knurled Dowel Pins

The full length of these pins is knurled for a tight grip that won't spin.

Half-Knurled Dowel Pins

Use these as pivot or hinge pins. The knurled half locks pins in position, while the smooth half acts as a pivot.

Center-Knurled Dowel Pins

Center-knurled pins are often used in place of clevis pins or to create T-handles. The knurled center locks pins in position, while the smooth ends act as a pivot.

Wood Biscuits

Made of compressed wood, these biscuits fit into slots cut into wood. When glued, they expand for a tight fit.

Half-Groove Dowel Pins with Notch

These pins are commonly used as anchors for tension springs. The grooved half locks pins in position, and spring ends fit in to the notch. Also known as type G pins.

Two-Way Barbed Dowel Pins

Use these pins to fasten components made of soft materials such as plastic or aluminum. Opposing barbs bite into each piece, pulling them together for a tight, secure fit.

Center-Groove Dowel Pins

Center-groove pins are often used in place of clevis pins or to create T-handles. The grooved center locks pins in position, while the smooth ends act as a pivot. Also known as type E pins.

Half-Groove Dowel Pins

These pins make good hinges or pivots. The grooved half locks pins in position, while the smooth half can act as a pivot. Also known as type H pins.

Round Head Full-Groove Dowel Pins

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

Quarter-Groove Dowel Pins

Quarter-groove pins are well suited for hinges or pivots. The grooved end locks pins in position, while the smooth portion can act as a pivot. Also known as type C pins.

Pins for Shear Hubs

For use with Browning shear hubs, these pins are designed to fail at specific loads to protect heavy duty machinery from torque overload.

Full-Groove Dowel Pins

Grooves run the full length of these pins for a firm hold that won't spin. Use them in place of standard dowel, spring, and taper pins to fasten parts. Also known as type A pins.

Round Head Barbed Dowel Pins

Barbs bite into plastics and soft metals such as aluminum for a strong hold, and a round head gives a finished appearance.

Ejector Pins

Push parts out of molds with these hardened pins. Also known as knockout and forged pins.

Shoulder-Style Ejector Pins

A thick shoulder makes these pins more rigid than standard ejector pins.

Core Pins

These pins have a flat head to fit into a counterbored hole.

Flush-Mount Core Pins

A 60° beveled head fits into a countersunk hole.

Punch Pins

Use these pins with a die to punch 1/8" and larger holes. Pins can be modified to fit your application.

Threaded Taper Pins

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

Taper Pins

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

Through-Hole Weld-On Pins

Pass these pins through a mounting hole and weld the head to the surface.

Surface-Mount Weld-On Pins

Weld these pins directly to a surface —no mounting hole required.

Captive Pins

Position, pivot, and align components. Also known as pilot pins and PEM® TP4, TPS, and MPP pins.

Captive Fastening Pins

Often used in cell phones and laptops, these pins attach thin panels such as printed circuit boards to metal and plastic bases. Also known as PEM® TA and T4 TackPins.

Captive Fastening Pins for Soft Materials

The grooves in these pins grip plastics and other soft materials. Press them in to hold panels together. Also known as PEM® TKA and TK4 TackSert pins.

Unthreaded Inserts

Unthreaded Inserts for Metal

Protect bolts from sideways (shear) pressure.

Steel Unthreaded Inserts for Plastic

A zinc-plated finish gives these steel inserts mild corrosion resistance.

Dowel Pin Assortments

Dowel pins are commonly used as pivots, hinges, shafts, jigs, and fixtures to locate or hold parts. They're slightly oversized for a tight fit.

Locating Pins

Mating Locating Pins and Hole Liners

Maintain consistent alignment in mating parts by installing a pin in one part and a liner in the other.

Locating Pins

Install these pins in a plate or table and mate with holes in a workpiece for precise alignment.

Shoulder-Style Locating Pins

The shoulder provides a consistent height reference point and keeps the pin from being pressed through the fixture.

Threaded Locating Pins

Screw the shank into a threaded hole for quick installation and removal.

Removable Locating Pins

A slightly undersized shank makes these pins easy to install and replace. Also known as slip-fit and lock-screw locating pins, they are held in place by a separate lock screw.

Cast-In Locating Pins for Plastics

Encase these pins while molding plastic or composite parts. Once set, the knurls resist movement, letting you align the workpiece with precision on a plate or table.

Through-Hole Alignment Pins

Precisely align drilled holes in two parts.

Slotted Bushings

When locating a workpiece using through-hole alignment pins, use one of these bushings and one standard bushing to prevent the pins from binding in your fixture.

Locating Pin Retractors

Use the handle on these retractors to extend and retract a locating pin, protecting the pin from damage in applications where fixtures move through a process, such as along a conveyor belt.

Air-Powered Locating Pin Retractors

A good choice for automated clamping, these retractors use compressed air to extend and retract a locating pin, protecting the pin from damage in applications where fixtures move through a process, such as along a conveyor belt.

Floating Locating Pins

The head on these pins slides side-to-side in one direction. Use one of these pins and one standard round-head pin to prevent jamming when loading and unloading workpieces with inconsistent hole spacing.

Locating and Support Buttons

Screw-Mount Locating and Support Buttons

Mount through the counterbored hole with a socket head cap screw to support and position workpieces and fixtures from the bottom or side.

Press-Fit Locating and Support Buttons

Support and position workpieces and fixtures from the bottom or side. These buttons press into a drilled hole for permanent installation.

Threaded Locating and Support Buttons

Use these buttons to support and position workpieces and fixtures from the bottom or side. Their hex shape lets you screw them into a threaded hole with a wrench or socket.

Domed-Head Locating and Support Buttons

Support rounded or irregularly shaped workpieces from the bottom or side with minimal contact.

Swiveling Locating and Support Buttons

The swiveling tip supports uneven and angled surfaces.

Spring-Loaded Guides

Threaded Spring-Loaded Guide Pins

Threading makes these guide pins easier to remove and replace than press fit, so they're useful for high-wear applications.

Installation Tools for Spring-Loaded Guide Pins

Use these tools for easier guide pin installation.

Sealed Spring-Loaded Guide Pins

Sealed at the top to prevent debris from getting inside and making them seize up, these guide pins are a good choice for machining fixtures.

Spring-Loaded Guide Pins

As the workpiece pushes against the pin head in one direction, the internal spring pushes back to hold it in place for clamping.

Create-Your-Own Spring-Loaded Guide Pins

Thread in a screw, handle, or other part to create the right size and shape guide pin for your application.

Spring-Loaded Guide Plungers

As the face of these plungers is pushed in, the internal spring applies outward pressure to hold a workpiece in position against stops and rails.

Spring-Loaded Guide Plungers for Thin Workpieces

Set the tang in a slot below the work surface to prevent thin material from sliding underneath the face.

High-Precision Index Plungers

To align two parts with more precision than standard spring plungers, these index plungers have a mating bushing that improves alignment and repeatability.

Inspection and Measuring Fixturing

Use these components in coordinate measuring machine (CMM) applications to raise a workpiece and reliably position it on a fixture plate with ¼"-20 holes.

Ball-Lock Quick-Change Fixture Clamps

Build these components into fixture plates, machine subplates, and tombstones for quick changes. The system clamps and locates at the same time for accurate positioning with repeatability of ±0.0005".

Hole-Alignment Pins

Line up holes by driving these pins through existing rivet, pin, and bolt holes in multiple pieces of metal. Alternatively known as lineup taper punches.

Double-Taper Hole-Alignment Pins

When one side wears out, use the other one. Also known as barrel drift pins.

No-Strike Hole-Alignment Pins for Flange Bolt Holes

Turn the pin and the tapered shaft forces the two holes into alignment.

Nonmarring Hole-Alignment Pins

These brass tools reduce marring on metal surfaces because they're softer than steel punches.

Double-Taper Nonsparking Hole-Alignment Pins

When one side wears out, use the other one.

Nonsparking Hole-Alignment Pins

Made from aluminum-bronze that is Factory Mutual approved, these nonmagnetic, corrosion-resistant tools inhibit sparking. They satisfy OSHA requirements for nonsparking tools.

Impact-Resistant Hole-Alignment Pins

Often called bull pins, these pins are designed to resist mushrooming caused by repeated pounding.

No-Strike Hex Head Alignment Pin Sets

The tapered shaft of these pins eliminates the need for hammering and prying when aligning flange bolt holes.

Hole-Alignment Pin Sets

Use alignment pins to align structural components such as I-beams and angle iron for bolting, riveting, and welding.

Nonmarring Hole-Alignment Pin Sets

These brass tools reduce marring on metal surfaces because they're softer than steel punches.

Pipe Flange Aligners

Stepped Pipe Flange Aligner Pins

Each step on these aligner pins matches common bolt holes on pipe flanges, so they're more precise than conical aligner pins and don’t require nuts. Press the pair of pins into mated flanges to make sure the flanges are aligned.

Pipe Flange Aligners with Protractor

Line up two pipe flanges and determine pipe angle with the included nut-and bolt pins, level, and protractor.

Pipe Flange Aligner Pins with Horizontal Level

Ensure horizontal alignment of pipe flanges with a level rod that runs between two alignment pins.

Pipe Flange Aligner Pins

Insert a pair of these nut-and bolt pins into adjacent flange holes and tighten to align flanges before connecting two pipes.