Plastic Rounds | McMaster-Carr

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16,180 Products

Raw Materials

Plastic

A lightweight alternative to metal and glass

Foam

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

Rubber

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

Carbon Fiber

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

Fiberglass

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

Garolite

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

Hard Fiber

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

Kevlar

Super tough for protection against prolonged wear and abrasion

Building and Machinery Hardware

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

Edge Trim

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

Grommets

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

Turntables

Rotate to reposition machinery and equipment

Protective Plugs

Protective Plugs

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

Protective Caps

Protective Caps

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

Ball Knobs

Provide grip on control levers and push-pull rods

Steering Wheel Knobs

Steering Wheel Knobs

Attach to steering wheels for one-hand operation

Knobs

Position, tighten, and secure fixtures and equipment

Hand Wheels

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

Indicating Knobs

Indicating Knobs

Control devices and view settings at a glance

Antislip Tape

Add traction to floors, stairs, and other walking surfaces

Lockouts

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

Vibration-Damping Mounts

Vibration-Damping Mounts

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

Bellows

Prevent dust and debris from damaging moving parts

Sealing

Gasket Material

Gasket Material

Cut custom shapes and sizes to fill gaps between flat surfaces

Pipe Gaskets

Form tight seals when connecting flanged pipe fittings

Tube Fitting Gaskets

Tube Fitting Gaskets

Prevent leaks when connecting sanitary tube fittings

Made-to-Order Gaskets

Made-to-Order Gaskets

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

Drum-Plug Gaskets

Drum-Plug Gaskets

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

Gauge Glass Gaskets

Gauge Glass Gaskets

Seal the glass on level indicators to monitor liquids without leaks

Boiler Gaskets

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

Hose Coupling Gaskets

Hose Coupling Gaskets

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

Manway Gaskets

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

Drain Gaskets

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

O-Rings

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

Backup Rings

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

Backer Rods

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

Rod Wipers

Scrape dirt off rods to keep the inside of cylinders clean

Spring-Loaded Seals

Spring-Loaded Seals

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

Head Seals

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

Shaft Seals

Prevent leaks in motors, pumps, and gearboxes

Wear Rings

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

Wear Ring Stock

Wear Ring Stock

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

U-Cup Seals

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

Piston Seals

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

Rod Seals

Maintain pressure inside cylinders and prevent fluid leaks

Packing Seals

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

Buffering Seals

Buffering Seals

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

Fastening and Joining

Washers

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

Cushioning Washers

Cushioning Washers

Cushion joints to dampen vibration and protect them from wear

Sealing Washers

Sealing Washers

Prevent fluids from leaking around fasteners

Lock Washers

Resist vibration to prevent fasteners from loosening

Finishing Washers

Finishing Washers

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

Insulating Washers

Insulating Washers

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

Spacers

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

Standoffs

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

Easy to tighten and loosen by hand for making frequent adjustments

Cap Nuts

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

Fastener Assortments

Fastener Assortments

Stay prepared by keeping fasteners in common sizes and materials on hand

Threaded Rods

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

Captive Panel Screws

Captive Panel Screws

Secure panels and enclosures while still having access to them

Rounded Head Screws

Rounded Head Screws

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

Snap-In Nuts

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

Binding Barrels and Screws

Binding Barrels and Screws

Thread together for a low-profile fastener

Power Transmission

Chain and Belt Pulleys

Chain and Belt Pulleys

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

Round Belts

Flexible to send rotary power between unparallel shafts

Sleeve Bearings

Sleeve Bearings

With no moving parts, the plainest type of bearing

Mounted Bearings

Mounted Bearings

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

Flanged Sleeve Bearings

Flanged Sleeve Bearings

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

Thrust Bearings

Thrust Bearings

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

Lead Screws and Nuts

Lead Screws and Nuts

Components travel along a screw with broad, square threads to clamp and lift heavy loads

U-Joints

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

Springs

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

Swivel Joints

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

Shaft Couplings

Shaft Couplings

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

Shaft Collars

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

Material Handling

Conveyor Belt Idler Pulleys

Conveyor Belt Idler Pulleys

Keep chain belts moving without sagging

Slings

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

Pulleys

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

Eyebolts

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

Shipping Tubes

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

Routing Rings

Suspend wire and cable by feeding it through the eyehole

Fluid Handling

Filter Paper

Remove particles from liquids in lab testing and other filtration applications

Filter Mesh

Strain particles out of various substances

Sintered Filters

Sintered Filters

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

Sights

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

Heating Pads

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

Floats

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

Facility and Grounds Maintenance

Paint Can Lid Rings

Paint Can Lid Rings

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

Floor Drains

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

Floor Drain Covers

Floor Drain Covers

Put a lid on open drains to prevent accidents and injuries

Rebar Caps

Brightly colored to alert workers to exposed rebar and pipe

Safety Equipment

Safety Mirrors

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

Communication

Signs

Everything from accident prevention to traffic control to exit signs

Tag Rings

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

Tags

Hang throughout facilities to convey information

Labels

Stick onto items to identify or convey information about them

Legend Plates

Mark switches and lights on control panels for easy identification

RFID Tags

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

Floor Decals

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

Stencils

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

Fire Hydrant Markers

Fire Hydrant Markers

Label fire hydrants to indicate their flow rate or status

Measuring and Inspecting

Protractors

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

Load Cells

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

Level Vials

Replace vials in levels or equipment

Fabricating and Machining

Polishing Bobs

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

Parts Baskets

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

Buffing Wheels and Pads

Buffing Wheels and Pads

Connect to a buffer or polisher to remove surface imperfections

Locating and Support Buttons

Locating and Support Buttons

Secure and position workpieces and fixtures from the bottom or side

Hole Saw Debris Collectors

Hole Saw Debris Collectors

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

Electrical

Wall Plates

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

Electrical Enclosures

Electrical Enclosures

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

Heat-Shrink Tubing

Heat-Shrink Tubing

Apply heat to seal and insulate electrical wiring and connections

Photoelectric Switch Reflectors

Photoelectric Switch Reflectors

Pair with sensor switches to reflect light back at them

Conduit and Conduit Fittings

Conduit and Conduit Fittings

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

Containers, Storage, and Furniture

Petri Dishes

Grow bacteria and other microorganisms

Trash Cans

Dispose of household garbage, recyclables, and even flammable waste

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)