Circles | McMaster-Carr

Filter by

Material

System of Measurement

Diameter

Length

Shape

Thickness

Screw Size

Width

Color

Hardness

Hardness Rating

DFARS Specialty Metals

Compliant

Exempt

Not Compliant

Export Control Classification Number (ECCN)

RoHS

Compliant with Exemptions

REACH

Cross Section Shape

Washer Type

Maximum Temperature

Specifications Met

Federal Specification

For Use With

Ball Bearing Housings

Ball Bearing Outer Rings

Bases

Beams

Bench Grinders

Bench-Top Cutoff Saws

Tolerance Rating

Performance

Finish

Corrosion-Resistant Coated

Minimum Temperature

58,041 Products

Most Likely Products

Steel

Strong, machinable, and weldable—all with material certificates for traceability

3,255 products

Aluminum

Lightweight, easy to machine, and corrosion resistant—all with material certificates for traceability

872 products

Plastic

A lightweight alternative to metal and glass

2,179 products

Washers

Nearly every size and shape imaginable, from flat washers to clipped to curved

4,828 products

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

1,243 products

Glass

Clear and highly heat and chemical resistant; often used in sights, lighting, and lab equipment

205 products

All Results

Raw Materials

Steel

Strong, machinable, and weldable—all with material certificates for traceability

3,255 products

Aluminum

Lightweight, easy to machine, and corrosion resistant—all with material certificates for traceability

872 products

Plastic

A lightweight alternative to metal and glass

2,179 products

Glass

Clear and highly heat and chemical resistant; often used in sights, lighting, and lab equipment

205 products

Stainless Steel

Resists corrosion and chemicals in most environments—all with material certificates for traceability

1,685 products

Foam

Pockets of air make it lighter in weight than rubber; good for packing, insulating, and sealing

150 products

Brass

More machinable than copper and bronze—all with material certificates for traceability

315 products

Ceramic

Hard and wear resistant, it also withstands corrosion and high temperatures

407 products

Rubber

Compresses and bounces back to shape; often used for sealing, cushioning, and shock absorbing

642 products

Tungsten

Our densest metal resists wear and heat to make end mills, heat shields, electrodes, and more

258 products

Bronze

Better wear resistance than copper and brass—all with material certificates for traceability

466 products

Lead

A dense insulator often used to shield against radiation and absorb sound and vibration

28 products

Wood

Commonly used to build ramps, crates, and prototypes or to make repairs

92 products

Felt

Thicker and more absorbent than fabric for insulating, polishing, cushioning, and gasketing

33 products

Copper

Our most conductive metal for electrical applications—all with material certificates for traceability

269 products

Garolite

A strong, machinable alternative to metal and plastic widely used in circuit boards and gears

601 products

Gold

Form into electronic components that won't corrode—all with material certificates for traceability

4 products

Mica

An electrical insulator that resists high temperatures; use in circuit breakers and heating elements

6 products

Titanium

The most corrosion-resistant metal we offer—all with material certificates for traceability

93 products

Nickel

An upgrade from stainless steel to withstand harsh chemicals and acids—all with material certificates for traceability

245 products

Carbon Fiber

The strongest composite we offer; comparable in strength to 6061 aluminum but lighter in weight

130 products

Fiberglass

A lightweight alternative to metal and wood widely used in electrical and structural applications

76 products

Wax

Create seals and prototypes, lubricate tools, and polish equipment

4 products

Graphite

Compressible or conductive for making high-temperature seals, furnace parts, and crucibles

34 products

Cobalt

Resists impact and rapid temperature changes—all with material certificates for traceability

3 products

Hard Fiber

Chemically treated to be hard and dense, this is the easiest composite to machine in our offering

18 products

Platinum

Formable and conductive while resisting extreme heat—all with material certificates for traceability

18 products

Molybdenum

Retains its shape and strength in extreme temperatures—all with material certificates for traceability

41 products

Tantalum

Conductive with a higher melting point than most metals—all with material certificates for traceability

16 products

Niobium

Conductive and corrosion resistant even at extreme temperatures—all with material certificates for traceability

8 products

Fastening and Joining

Washers

Nearly every size and shape imaginable, from flat washers to clipped to curved

4,828 products

Sealing Washers

Prevent fluids from leaking around fasteners

751 products

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

167 products

Lock Washers

Resist vibration to prevent fasteners from loosening

1,660 products

Finishing Washers

Screw heads sit flush to prevent snagging and to create a neat, finished appearance

156 products

Insulating Washers

Isolate screws from electrical current and prevent corrosion from mating different metals

277 products

Leveling Washers

Curved or tapered to compensate for uneven mounting surfaces

195 products

Cross-Bracing Washers

Connect cross-bracing rods or cables to structural beams; also known as hillside washers

20 products

Shims

Align and space components on shafts, or level machinery, cabinets, and doors

2,910 products

Dowel Pins

Align parts before assembly or use as a pivot, shaft, or hinge to join moving components

3,557 products

Cotter Pins

Secure the ends of clevis pins and shafts to keep components in place

8 products

Shear Pins

Use with shear hubs to break at a specific torque and safeguard machinery from overloads

61 products

Quick-Release Pins

Fasten or remove components on equipment with a spring-loaded retaining ball

6 products

Weld Pins

Weld in place for greater rigidity and strength than other pins

28 products

Dowel Pin Stock

Cut to the length you need for positioning and holding parts in place

53 products

Retaining Rings

Hold components on a shaft

2,362 products

Standoffs

Threaded to separate or connect parts as well as position components in assemblies

1,124 products

Split Rings

Secure clevis pins, connect components, or add a pull handle; also known as key rings

67 products

Nails

Drive into wood, plastic, drywall, and masonry

22 products

Machine Keys

Transmit torque from rotating shafts to gears, sprockets, and other machine parts

427 products

Screw Nails

Drive like nails but hold like screws in drilled holes in wood, plastic, drywall, and masonry

72 products

Thread Adapters

Join threads of a different type, size, and gender

52 products

Anchors

Secure anything from signs to heavy machinery in concrete, brick, and drywall

104 products

Tape

Bind, seal, and mark surfaces

143 products

Magnets

Attract or repel metal objects to hang, secure, or position them

864 products

Electromagnets

Place on flat metal surfaces and turn on the power to create a magnetic hold

25 products

Adhesives

Bond surfaces together

1 product

Hook and Loop

Press to interlock pieces and fasten materials together

40 products

Brazing Alloys

Form stronger bonds between metal parts than solder without melting the base material

138 products

Brazing Rings

Snap into metal pipe and tubing to form leak-resistant joints more quickly than with hand-fed alloys

11 products

Snap-Together Fasteners

Mate the mushroom-shaped heads to join materials together with more holding power than hook and loop

4 products

TIG Welding Rods

Add extra metal while TIG welding to help flatten welds and hold workpieces together

299 products

Solder

Join pieces of metal without melting the base material

341 products

Building and Machinery Hardware

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

1,243 products

Vibration-Damping Mounts

Attach to machinery to reduce vibration and noise and extend service life

19 products

Protective Feet

Add to furniture and light equipment to protect floors from scratches and wear

139 products

Antislip Tape

Add traction to floors, stairs, and other walking surfaces

2 products

Lockouts

Ensure that machines stay turned off to prevent accidents during maintenance work

4 products

Fabricating and Machining

Precision Knife Blades

Replace the blade in a precision knife

1 product

Circle Cutters

Create circular openings in drywall for pipes, conduit, and light fixtures

1 product

Router Guides

Make precise circular or intricate cuts with routers

1 product

Grinding Wheels

Add to grinders to remove material from work surfaces using abrasion

630 products

Grinding Cones

For corners and the inside of castings, remove large amounts of material and leave a rough surface

42 products

Grinding Bits

Pair with grinders for light material removal and precision grinding

401 products

Cutoff Wheels

Install in grinders to cut through metal, concrete, and ceramics

333 products

Cutoff Saw Wheels

Replace the wheel on your cutoff saw

82 products

Spiral Saw Cutoff Wheels

Attach to your RotoZip spiral saw to make straight cuts

3 products

Rotary Tool Circle Cutters

Attach to rotary tools to cut circular holes in a variety of materials

1 product

Rotary Tools

Grind, sand, finish, and polish workpieces

1 product

Rotary Tool Blades

Replace the blade on your Dremel rotary tool

33 products

Rotary Tool Cutoff Wheels

Replace the cutoff wheel on your Dremel rotary tool

34 products

Rotary Tool Accessories

Complete a wide range of cutting, grinding, and sanding tasks with your rotary tool

9 products

Rotary Tool Buffing and Polishing Kits

Buff, polish, and clean with rotary tools

1 product

Wire Brushes

Scrub by hand or connect to power tools to clean, polish, deburr, and remove rust

1,591 products

Buffing Kits

Everything you need to remove scratches and surface imperfections with a buffer or polisher

4 products

Buffing and Polishing Wheels

Remove surface imperfections to achieve a precise, flat finish

155 products

Polishing Bonnets

Remove swirl marks and imperfections from a surface after buffing

6 products

Buffing and Polishing Applicator Bonnets

Apply waxes and polishing compounds before buffing and polishing

1 product

Buffing and Polishing Pads

Remove imperfections and apply protective coatings on delicate surfaces

7 products

Lapping Film

Polish workpieces without the mess of pastes and slurries

49 products

Sanding Disc Adapters

Swap between hook-and-loop and adhesive-backed sanding discs without also switching the sanding pad

4 products

Sanding Backup Pads

Attach sanding discs to power tools and reinforce the discs

109 products

Sanding Blocks

For better control than powered sanders, sand surfaces manually

8 products

Sanding Discs

Add to sanders, floor buffers, and other tools to smooth out workpieces and remove paint and rust

1,771 products

Sanding Pads

Reach into pipes, tubes, corners, and slots to smooth their surfaces and remove paint and rust

3 products

Clamp Holding Washers

Replace worn washers on open-arm toggle clamps to keep holding screws in place

12 products

Sanding Disc Cushioning Pads

Add between your sanding disc and backup pad for a finer finish

4 products

Communication

Tags

Hang throughout facilities to convey information

123 products

Labels

Stick onto items to identify or convey information about them

108 products

Fire Hydrant Markers

Label fire hydrants to indicate their flow rate or status

4 products

RFID Tags

Track the location of inventory in your facility; pair with RFID reader/writers

22 products

Legend Plates

Mark switches and lights on control panels for easy identification

2 products

Floor Decals

Stick to the floor to give instructions or direct traffic in and around your facility

38 products

Stencils

Paint over or trace to create everything from custom messages to drafting designs

8 products

Stamps

Mark surfaces such as metal, cardboard, paper, or fabric with indentations or ink

95 products

DVDs

Record video for playback on a computer or DVD player

1 product

CDs

Record audio for playback on a computer or stereo

1 product

Signs

Everything from accident prevention to traffic control to exit signs

10 products

Sealing

O-Rings

Fit snugly into a groove between parts to create a leak-resistant seal

10,708 products

Backup Rings

Extend the life of O-rings and improve their performance under high pressure

263 products

Tube Fitting Gaskets

Prevent leaks when connecting sanitary tube fittings

424 products

Wear Rings

Guide rods and pistons to prevent uneven wear and extend the life of seals

54 products

Measuring and Inspecting

Compass Point-Holding Clamps

Attach to a pipe, ruler, or beam to scribe circles and arcs too large for a compass

3 products

Layout Compasses

Draw circles and transfer distance measurements

27 products

Parallel Rules

Draw parallel lines, as well as circles, arcs, and angles

1 product

Levels

Ensure surfaces are completely horizontal or vertical

35 products

Level Vials

Replace vials in levels or equipment

9 products

Bore Gauges

Insert into a hole and expand the contacts to measure diameter

2 products

Micrometer Check Gauges

Confirm your outside or depth micrometers are accurate

5 products

Metal Detector Calibration Kits

Test the sensitivity of food-processing metal detectors

1 product

Magnifiers

Workstation, hand-held, headband, and eyeglass magnifiers

1 product

Coordinate Measuring Machine Plates and Fixtures

Raise workpieces and position them on a fixture plate

11 products

Machine Vision Lights

Illuminate an object so your machine vision camera can capture detailed images for inspection

6 products

Material Handling

Chain Rings

Join chains and add connectors for binding, towing, and lifting

44 products

Wheels

Move objects with ease

652 products

Routing Rings

Suspend wire and cable by feeding it through the eyehole

40 products

Tie-Down Washers

Angled sides align and hold tie-down straps

5 products

Facility and Grounds Maintenance

Floor Drain Covers

Put a lid on open drains to prevent accidents and injuries

4 products

Drain Cleanout Hole Covers

Conceal drain cleanout plugs in walls and floors while keeping them accessible

26 products

Manhole Covers

Made of cast iron to handle high-volume foot and vehicle traffic.

6 products

Drain Cleanouts

Create an access point to inspect and clean floor drain pipelines

3 products

Rebar

Reinforces concrete to reduce the chance it will crack from expansion and contraction

9 products

Paint Can Lid Rings

Fit around the entire rim of paint cans to secure lids more tightly than clips

4 products

Power Transmission

Springs

Apply and absorb force with compression, die, extension, torsion, and disc springs

1,682 products

Bearing Lock Washers

Lock bearing nuts in place to prevent loosening due to vibration

103 products

Shafts

Transmit power, motion, and speed between machine components

3,149 products

Splines and Spline Bearings

Transmit rotary power or move loads along the length of splines

35 products

Ball Screw/Splines

Transmit rotary power, move loads along the shaft, or do both at once

3 products

Safety Equipment

Safety Mirrors

See what's happening around corners, at intersections, down aisles, and over counters

125 products

Welding Lenses

Replace the lens in your welding helmet or goggles

14 products

Fluid Handling

Filter Mesh

Strain particles out of various substances

217 products

Corrosion-Inhibiting Rods and Pads

Protect tanks, water heaters, and heat exchangers from rust; also known as sacrificial anodes

35 products

Sintered Filters

Tiny holes let particles such as air, gas, and vapor pass through while trapping contaminants

14 products

Heating Pads

Stick to drums, pails, and other containers to indirectly warm their contents

26 products

Pressure-Relief Discs

Rupture at a set pressure or temperature to vent fluid and gas and protect machinery; one-time use

39 products

Tube Fitting Markers

Snap onto push-to-connect fittings to identify different tubing lines

13 products

Containers, Storage, and Furniture

Petri Dishes

Grow bacteria and other microorganisms

8 products

Drum Locking Rings

Clamp lids onto drums for a tight seal

7 products

Electrical

Battery-Terminal Washers

Stop battery acid fumes from corroding terminal posts

1 product

Electrical-Terminal Washers

Prevent wires from slipping out from under screw heads to keep electrical connections intact

6 products

Lighting

Light Pipes

Concentrate and direct light from the bulb on a circuit board to a display

16 products