Plastic Rounds | McMaster-Carr

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Material

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Diameter

Color

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Performance

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Maximum Temperature

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Compliant with Exemptions

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DFARS Specialty Metals

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For Use With

Alcohol-Based Solvents

Angle Grinders

Bases

Bench Grinders

Bench-Top Cutoff Saws

Diluted Salt Solutions

Hardness

Minimum Temperature

Width

Hardness Rating

Mount Type

Flexibility

Environment

High-Pressure Washdown

High-Temperature Washdown

22,048 Products

Raw Materials

Plastic

A lightweight alternative to metal and glass

2,178 products

Rubber

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

329 products

Foam

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

110 products

Garolite

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

601 products

Fiberglass

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

76 products

Carbon Fiber

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

130 products

Kevlar

Super tough for protection against prolonged wear and abrasion

5 products

Hard Fiber

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

17 products

Building and Machinery Hardware

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

380 products

Edge Trim

Install on panels, boards, signs, and mirrors to protect edges from impact

3 products

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

258 products

Protective Caps

Protect just about anything, including pipe, flanges, screws, and posts

726 products

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

373 products

Turntables

Rotate to reposition machinery and equipment

11 products

Ball Knobs

Provide grip on control levers and push-pull rods

171 products

Knobs

Position, tighten, and secure fixtures and equipment

204 products

Steering Wheel Knobs

Attach to steering wheels for one-hand operation

3 products

Hand Wheels

Rotate to adjust machinery, valves, drill presses, and other equipment

78 products

Indicating Knobs

Control devices and view settings at a glance

61 products

Overhead Door Rollers

Replace the rollers on garage doors and other overhead doors

6 products

Drawer Rollers

Open wood cabinet drawers and doors without using drawer slides or roller track

2 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

Vibration-Damping Mounts

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

10 products

Access Panels

Install in ceilings, walls, concrete floors, and tanks to access and inspect inside

4 products

Bellows

Prevent dust and debris from damaging moving parts

280 products

Door Tracks

Hang panels to slide over openings when there’s not space for a swinging door

1 product

Power Transmission

Sleeve Bearings

With no moving parts, the plainest type of bearing

803 products

Flanged Sleeve Bearings

A sleeve and thrust bearing in one to support both parallel and perpendicular loads

804 products

Turntable Bearings

Support machinery that slowly turns or oscillates, such as a rotating hoist

32 products

Thrust Bearings

Support loads parallel to the shaft with plain, ball, or roller bearings

321 products

Mounted Bearings

Ball, roller, and sleeve bearings ready to bolt in place

250 products

Linear Bearings

Minimize friction as parts move along a shaft

252 products

Ball Bearings

Create less friction than other bearings for use at high speeds

537 products

Roller Bearings

Support higher loads than ball bearings, but run at lower speeds

52 products

Round Belt Drive Pulleys

Mount directly onto a shaft and pair with round belts to transmit rotary motion and torque

15 products

Round Belts

Flexible to send rotary power between unparallel shafts

230 products

V-Belt Drive Pulleys

Pair with a V-belt to transfer motion from a rotating shaft

21 products

Timing Belt Drive Pulleys

Pair with a timing belt to keep your drive system in sync

85 products

Round Belt Idler Pulleys

Spin freely on built-in bearings to reduce wear and vibration on round belts

12 products

Flat Belt Idler Pulleys

Spin freely on built-in bearings to reduce wear and vibration on flat belts

18 products

V-Belt Idler Pulleys

Spin freely on built-in bearings to reduce wear and vibration on V-belts

14 products

Flat Belt Drive Pulleys

Pair with a flat belt to transfer motion from a rotating shaft

25 products

Shaft Collars

Hold and position parts on a shaft, or limit shaft movement

141 products

Disc Springs

Maintain tension and separate components on shafts, under bolt heads, and at the ends of valves

19 products

Precision Lead Screw Nuts

Pair with precision lead screws for accurate starts and stops in your assembly

34 products

Swivel Joints

Handle shaft misalignment where ball joint rod ends won’t fit; also known as spherical bearings

66 products

Idler Rollers

Guide boxes and parts as they pass through conveyor systems

85 products

Drive Rollers

Transmit power from motors to systems like conveyors; also known as contact wheels and feed rollers

182 products

Track Rollers

Support and carry objects as they move along conveyor systems

18 products

Idler/Drive Rollers

Spin freely in one direction on conveyor systems and lock to transmit power in the other direction

3 products

U-Joints

Transfer torque between shafts at an angle; handle more torque and misalignment than flexible shafts

7 products

Shaft Couplings

Connect two shafts to transfer rotary motion from one to the other

161 products

Air Cylinders

Push and pull loads to do everything from stamping materials to sorting parts on conveyors

106 products

Sealing

O-Rings

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

1,433 products

Backup Rings

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

122 products

Gasket Material

Cut custom shapes and sizes to fill gaps between flat surfaces

20 products

Tube Fitting Gaskets

Prevent leaks when connecting sanitary tube fittings

109 products

Pipe Gaskets

Form tight seals when connecting flanged pipe fittings

441 products

Drain Gaskets

Create a watertight seal between your drain and fixture without the mess of plumber's putty

3 products

Made-to-Order Gaskets

Send your exact specifications to get gaskets that fit precisely between surfaces

4 products

Drum Plug Gaskets

Form a tighter seal in drum openings than with a drum plug alone

2 products

Gauge Glass Gaskets

Seal the glass on level indicators to monitor liquids without leaks

2 products

Boiler Gaskets

Resist heat and steam to form a leak-resistant seal around closures on boilers

3 products

Hose Coupling Gaskets

Form tight seals on cam-and-groove, grip-lock, and twist-claw hose connections

21 products

Manway Gaskets

Create a tight seal between the nozzle and lid of tank car manways

4 products

Backer Rods

Insert into gaps before caulking to reduce how much sealant you need and improve adhesion

35 products

Shaft Seals

Prevent leaks in motors, pumps, and gearboxes

106 products

Head Seals

Maintain a seal even under fluctuating pressure; more reliable than an O-ring with a backup ring

11 products

Rod Wipers

Scrape dirt off rods to keep the inside of cylinders clean

87 products

Spring-Loaded Seals

Seal rods and pistons with a wider range of temperature and chemical resistance than U-cup seals

54 products

Wear Rings

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

54 products

Rod Seals

Maintain pressure inside cylinders and prevent fluid leaks

50 products

Wear Ring Stock

Cut to make wear rings that fit any rod or bore to prevent uneven wear and extend the life of seals

12 products

U-Cup Seals

With a lip on both the inside and outside edges, they can be used for sealing rods and pistons

122 products

Piston Seals

Prevent leaks inside pistons by creating a seal against the cylinder bore

43 products

Packing Seals

Fill in gaps around pump shafts, valve stems, and agitators to prevent leaks

45 products

Buffering Seals

Protect hydraulic cylinders from pressure spikes and shock in high-pressure applications

22 products

Fastening and Joining

Washers

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

1,191 products

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

116 products

Sealing Washers

Prevent fluids from leaking around fasteners

75 products

Insulating Washers

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

252 products

Lock Washers

Resist vibration to prevent fasteners from loosening

9 products

Finishing Washers

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

14 products

Spacers

Unthreaded to create space between two surfaces or objects, often to align them

1,385 products

Standoffs

Separate, position, or connect components in assemblies

250 products

Rivet Nuts

Add threads to thin panels with access from only one side; also known as blind inserts

37 products

Snap-In Nuts

Push into square holes in thin materials to add bolts for aligning off-center parts

9 products

Captive Panel Screws

Secure panels and enclosures while still having access to them

9 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

21 products

Fastener Assortments

Keep a variety of common screws, nuts, and washers on hand

1 product

Rounded Head Screws

Sit just above the surface for a low-profile finish and hold tighter than flat head screws

641 products

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

25 products

Threaded Rods

Anchor, connect, or hang components in a wide variety of applications

158 products

Binding Barrels

Create custom low-profile fasteners with binding barrel posts, caps, and screws

35 products

Magnets

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

6 products

Material Handling

Conveyor Belt Idler Pulleys

Keep chain belts moving without sagging

4 products

Conveyor Rollers

Support and move objects along conveyors

191 products

Conveyor Roller Bearings

Replace bearings on conveyor rollers, or press into tubing or pipe to create a roller

34 products

Ball Transfers

Install in arrays to create platforms for conveying, rotating, and positioning heavy objects

53 products

Skate Wheels

Replace wheels on skate wheel conveyors or add wheels for a custom setup

41 products

Slings

Grip and lift loads with hoists and cranes; made of webbing, rope, or chain

12 products

Pulleys

Mount or suspend to guide wire rope for lifting and pulling loads

62 products

Wheels

Move objects with ease

383 products

Eyebolts

Route rope through the loop or attach hooks and shackles for lifting

26 products

Shipping Tubes

Protect rods, rolled-up blueprints, and other long, thin objects during shipping

357 products

Routing Rings

Suspend wire and cable by feeding it through the eyehole

5 products

Drum Dollies

Instead of tilting heavy loads on drum trucks, roll drums upright to where you need them

29 products

Fluid Handling

Filter Paper

Remove particles from liquids in lab testing and other filtration applications

14 products

Filter Mesh

Strain particles out of various substances

4 products

Sieves

Sift material by shaking and letting it fall through

5 products

Sintered Filters

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

6 products

Floats

Replace a float or combine with a rod and valve body to build your own float valve

22 products

Sights

Observe and monitor the contents of pipes, tanks, and other containers

18 products

Heating Pads

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

26 products

Fabricating and Machining

Buffing and Polishing Pads

Remove imperfections and apply protective coatings on delicate surfaces

7 products

Polishing Bobs

Attach to a drill or grinder to polish small and hard-to-reach areas

7 products

Buffing and Polishing Wheels

Remove surface imperfections to achieve a precise, flat finish

8 products

Polishing Bonnets

Remove swirl marks and imperfections from a surface after buffing

1 product

Wire Brushes

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

298 products

Cutoff Saw Wheels

Replace the wheel on your cutoff saw

69 products

Cutoff Wheels

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

318 products

Flap Wheels

Create a uniform finish on flat and curved surfaces without gouging them

17 products

Parts Baskets

Contain parts for cleaning and moving them in and out of washers

14 products

Hole Saws

Connect to a drill or drill press to make circular cuts

2 products

Spiral Saw Cutoff Wheels

Attach to your RotoZip spiral saw to make straight cuts

2 products

Hole Saw Debris Collectors

Catch dust and chips as you cut holes in walls and ceilings

1 product

Rotary Tool Cutoff Wheels

Replace the cutoff wheel on your Dremel rotary tool

18 products

Files

Deburr, polish, and sharpen nearly any material, such as metal, plastic, ceramic, and wood

6 products

Sharpening Stones

Sharpen a variety of tools such as knives, chisels, and plane blades

2 products

Spring Locating Pins

Apply side force to workpieces to clamp them in place

15 products

Spring Stops

Push back against workpieces to hold them in place against stops and rails

4 products

Sanding Blocks

For better control than powered sanders, sand surfaces manually

2 products

Sanding Discs

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

1,186 products

Hole Punches

Punch holes in metal, plastic, and fabric

7 products

Router Guides

Make precise circular or intricate cuts with routers

3 products

Locating and Support Buttons

Secure and position workpieces and fixtures from the bottom or side

5 products

Drill Bit Guides

Drill precise holes without building a fixture

4 products

Sanding Disc Cushioning Pads

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

4 products

Sanding Bits

Smooth out small, recessed, and hard-to-reach areas, and also remove paint and rust

10 products

Measuring and Inspecting

Levels

Ensure surfaces are completely horizontal or vertical

6 products

Level Vials

Replace vials in levels or equipment

2 products

Protractors

Set bevels and measure angles with everything from pocket-size to long-arm protractors

2 products

Radius Gauges

Check convex and concave radii of tools, patterns, and dies

6 products

Load Cells

Measure forces and send them to computers to monitor and trigger actions in machinery

12 products

Machine Vision Lights

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

6 products

Electrical

Wall Plates

Cover switches and outlets for a finished look or to close them off when not in use

1 product

Terminals

Attach wire endings everywhere from circuit breaker panels to batteries

229 products

Manual Switches

Everything from toggle, push-button, and rocker switches to foot switches

423 products

Photoelectric Switch Reflectors

Pair with sensor switches to reflect light back at them

10 products

Fish Tape

Hook to the end of wire and move it through conduit and raceway

7 products

Electrical Enclosures

House and protect power supplies, control panels, and other electrical equipment

4 products

Heat-Shrink Tubing

Apply heat to seal and insulate electrical wiring and connections

3 products

Conduit and Conduit Fittings

Protect wiring from impact and the environment in runs indoors, outdoors, and underground

51 products

Capacitors

Deliver a burst of electrical energy for a short time to boost power to motors and other equipment

41 products

Facility and Grounds Maintenance

Paint Can Lid Rings

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

4 products

Floor Drains

Catch liquid from the floor and direct it down a drain pipe

4 products

Floor Drain Covers

Put a lid on open drains to prevent accidents and injuries

2 products

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

4 products

Safety Equipment

Safety Mirrors

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

80 products

Containers, Storage, and Furniture

Petri Dishes

Grow bacteria and other microorganisms

7 products

Drums

Ship and store large volumes of liquid or dry materials

2 products

Trash Cans

Dispose of household garbage, recyclables, and even flammable waste

14 products

Sanding Abrasive Dispensers

Organize your sanding rolls so they're ready to grab and go

2 products

Communication

Signs

Everything from accident prevention to traffic control to exit signs

2 products

Tag Rings

Loop onto tags to attach them to lanyards, key rings, and other objects

1 product