Round Spacers | McMaster-Carr

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

REACH Compliant

	Color Color

Amber

	Specifications Met Specifications Met

	Finish Finish

Cadmium Yellow-
Chromate Plated

Chrome Plated

Corrosion-Resistant-
Coated

Galvanized

Glazed

Hot-Dipped Galvanized

Yellow-Chromate Plated

Zinc Plated

Zinc Yellow-Chromate
Plated

Zinc-Flake Coated

	Tensile Strength Tensile Strength

100,000 psi or greater

Not Rated

	For Drill Bit Size For Drill Bit Size

	Height Height

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	Mount Type Mount Type

18,351 Products

Unthreaded Spacers

Aluminum Unthreaded Spacers

Made of aluminum, these spacers are lightweight and mildly corrosion resistant.

18-8 Stainless Steel Unthreaded Spacers

18-8 stainless steel spacers have good corrosion resistance.

Zinc-Plated Steel Unthreaded Spacers

The zinc plating provides some corrosion resistance.

316 Stainless Steel Unthreaded Spacers

These spacers have excellent corrosion resistance and are passivated for enhanced protection.

Zinc-Plated Brass Unthreaded Spacers

Brass makes these spacers electrically conductive and the zinc-plated finish adds corrosion resistance.

Black-Anodized Aluminum Unthreaded Spacers

The anodized coating on these lightweight spacers provides increased abrasion resistance over uncoated aluminum.

Titanium Unthreaded Spacers

Choose titanium spacers for their high strength-to-weight ratio and excellent corrosion resistance.

Nylon Unthreaded Spacers

These spacers have excellent wear and abrasion resistance. Exposure to moisture may cause them to expand.

Polyethylene Unthreaded Spacers

Almost nonabsorbent, these unthreaded LDPE and HDPE spacers won't swell when exposed to water.

Polypropylene Unthreaded Spacers

Polypropylene spacers have a hard surface and resist many chemicals and solvents.

Acetal Unthreaded Spacers

Naturally slippery and wear resistant, acetal spacers also offer some resistance to moisture.

Polycarbonate Unthreaded Spacers

Made of FDA-listed material, these clear spacers can be used in food and beverage applications.

PEEK Unthreaded Spacers

Use PEEK spacers as an alternative to metal spacers in high-temperature, high-stress applications. They resist chemicals, wear, and moisture.

PTFE Unthreaded Spacers

PTFE spacers have a slippery surface and surpass most plastic spacers when it comes to chemical resistance and performance in extreme temperatures.

Vibration-Damping Unthreaded Spacers

Reduce vibration, shock, and noise with these spacers that compress between components.

Polished Unthreaded Spacers

With their mirror-like finish, these are the go-to spacers when appearance matters.

Made-to-Order Unthreaded Spacers

Choose the OD, ID, length, and material and we will accommodate your unique spacer needs.

Unthreaded Spacer Stock

Cut stock to the length you need.

Electrical-Insulating Unthreaded Spacers

Protect components from electrical charges.

Slotted Unthreaded Spacers

An economical alternative to standard unthreaded spacers.

Unthreaded Spacers for Keyed Shafts

Also known as arbor spacers, these are notched to space components on a keyed shaft.

Unthreaded Spacers for Tubes

Also known as saddle washers, the curved end fits against round objects such as tube and pipe.

Unthreaded Spacers for Angles

The 45° end fits against an angled surface to create a flat surface for connection.

Threaded Standoffs

Female Threaded Round Standoffs

Male Threaded Standoffs

Male-Female Pillar Posts

Sanitary Threaded Standoffs

Mount components onto food processing lines, walls, and sanitary equipment while leaving space to clean in between.

Female Pillar Posts

Electrical-Insulating Female Threaded Standoffs

Protect components from electrical charges.

Hinged Male Threaded Round Standoffs

Hinged Male-Female Threaded Round Standoffs

Hinged Female Threaded Round Standoffs

Snap-In Supports

Vibration-Damping Snap-In Supports

The ends of these removable supports snap in and compress between panels to reduce vibration of miniature cooling fans in compact electronics.

Snap-In Supports

Wings add tension to strengthen the hold in a hole. The other end is releasable for repairs and upgrades.

Stackable Snap-In Supports

Designed for multi-level printed circuit board applications, these self-aligning, through-hole supports have a chamfered female end for stacking. The other end snaps and locks in place for a permanent connection.

Adhesive-Back Snap-In Supports

Stick these supports to surfaces where you don't want to drill a hole. The snap-in end can be released for repairs and upgrades.

Dual Locking Snap-In Supports

Both ends snap and lock in place for a permanent connection.

Flat-Top Snap-In Supports

The flat top supports boards without drilling a hole while wings on the other end add tension for a secure hold in a hole.

Press-Fit Unthreaded Spacers

Also known as captive spacers, the splines on these bite into a panel for a permanent hold.

Crimp-On Female Threaded Round Standoffs

Often called swage standoffs because you permanently crimp them into a panel.

Press-Fit Threaded Standoffs

Miniature Press-Fit Threaded Standoffs with Open End

These standoffs are designed to fit in the limited space of compact electronics such as laptops and hand-held devices.

Splined Press-Fit Threaded Standoffs with Open End

Press-Fit Threaded Standoffs with Closed End

Press-Fit Threaded Standoffs with Open End

Press-Fit Supports

Press-Fit Snap-Top Supports

With the end clinched in place, the prongs allow you to quickly snap a panel on and off these supports.

Press-Fit Keyhole Supports

Once the end is clinched in place, panels with keyholes easily slide on and off these supports.

Metal Washers

Oversized Washers

Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses for covering oversized holes or for use as spacers and levelers.

Metric Oversized Washers

Compared to our general purpose washers, these have exaggerated diameters and/or thicknesses. Use them to cover oversized holes, hold heavy fastening loads, or as spacers and levelers.

General Purpose Washers

Metric General Purpose Washers

Use these metric washers to evenly distribute the load under bolt or screw heads and nuts when fastening. They can also act as spacers.

Mil. Spec. Washers

Choose these washers for their adherence to strict military standards for material and construction.

SAE Washers

SAE washers generally have a smaller ID and OD than USS washers.

ASME Washers for Soft Material

Also known as Type B washers, these distribute your fastener's load over a larger surface area than other washers to minimize damage to soft materials.

USS Washers

USS washers generally have a larger ID and OD than SAE washers.

Washers with Material Certification

These washers come with a traceable lot number and a physical and chemical test report.

Washers for Structural Applications

Designed for use with A325 structural screws, studs, and nuts, these washers are often used for construction and exterior building applications.

Metric Washers for Structural Applications

These thick washers are designed to support structural screws, studs, and nuts.

Washers for Blind Rivets

Also known as backup washers, these are for use with blind rivets for extra support when fastening into soft material.

Plastic Washers

Chemical-Resistant Plastic Washers

These washers surpass most other plastic washers when it comes to withstanding chemicals, oil, and grease.

Metric Chemical-Resistant Plastic Washers

These metric washers surpass most other plastic washers when it comes to withstanding chemicals, oil, and grease.

Mil. Spec. Chemical-Resistant Plastic Washers

Choose these washers for their adherence to strict military standards for material and construction.

Plastic Washers

Metric Plastic Washers

Mil. Spec. Plastic Washers

Choose these washers for their adherence to strict military standards for material and construction.

Water- and Steam-Resistant Plastic Washers

Low moisture absorption and good heat resistance make these washers suitable for wet and harsh environments.

Metric Water- and Steam-Resistant Plastic Washers

Low moisture absorption and good heat resistance make these metric washers suitable for wet and harsh environments.

Electrical-Insulating Plastic Washers

Metric Electrical-Insulating Plastic Washers

High-Temperature Plastic Washers

These washers can withstand temperatures up to 450° or 500° F without degrading.

Metric High-Temperature Plastic Washers

These metric washers can withstand temperatures up to 450° or 500° F without degrading.

Ceramic and Mica Washers

Metric Extreme-Temperature Ceramic Washers

These metric washers hold up in blistering temperatures up to 3000° F.

Extreme-Temperature Ceramic Washers

These washers hold up in blistering temperatures up to 3000° F.

High-Temperature Mica Washers

Mica washers withstand temperatures up to 1050° F.

Easy-Install Slotted Washers

A slot in the side allows you to install and remove these washers without completely disassembling your joint.

Cushioning Washers

These wool felt washers can be soaked with oil to lubricate joints.

Abrasion-Resistant Cushioning Washers

These SBR rubber washers are reinforced with cloth fibers.

Abrasion-Resistant Leather Washers

These leather washers are nonmarring.

Moisture-Resistant Cushioning Washers

These polyurethane washers withstand wet conditions as well as sunlight, ozone, and some chemicals.

Sealing Washers

Metal Sealing Washers

Also known as crush washers, these compress when tightened to form a tighter, more durable seal than rubber washers. They are commonly used to seal fluids such as oil and fuel.

Abrasion-Resistant Rubber
and Plastic Sealing Washers

Made of durable material, these washers resist wear from rubbing and scraping surfaces.

Weather-Resistant Rubber Sealing Washers

Sunlight, ozone, and water won’t affect these washers.

Chemical-Resistant Rubber Sealing Washers

These washers withstand harsh chemicals such as acetic acid and isopropyl alcohol.

Oil-Resistant Rubber Sealing Washers

These washers surpass other rubber washers when it comes to withstanding oil, grease, and fuel.

Leveling Washers

Metric Leveling Washers

Round Shims

Ring Shims

Precisely align, level, and adjust spacing on fasteners and shafts with these shims.

Ring Shim Sets

Be prepared with ring shims in a variety of thicknesses. These shims fit around fasteners and shafts to precisely align, level, and adjust spacing.

Wide-Rim Ring Shims

Also known as machinery bushings, these shims have an oversized OD to create a larger bearing surface for reduced wear between moving parts.

Tight-Fit Ring Shims

For a snug fit around a shaft, the ID of these shims is held to a tighter tolerance than other round shims.

Color-Coded Ring Shims

Precisely align, level, and adjust spacing on fasteners, shafts, and machinery with these shims, which are color-coded by thickness for easy identification.

Peel-Away Layered Ring Shims

These shims are made of layers of metal bonded with adhesive. Remove layers with a utility knife until you get the thickness you need.

Color-Coded Ring Shim Sets

Be prepared with ring shims in a variety of thicknesses. These shims are color-coded by thickness for easy identification.

Shims for Lengthening Screw Shoulders

Spin these shims onto screw threads to extend the shoulder length.

Shims for Shortening Screw Shoulders

Slide these shims under the screw head to shorten the shoulder length.

Disc Shims

Use these round shims as they are, or punch out the middle to create the ID you need.

Shims for D-Profile Shafts

These shims are shaped to fit over D-profile shafts. Use them to precisely align, level, and adjust spacing.

Shim Sets for D-Profile Shafts

Be prepared with shims in a variety of thicknesses. These shims are shaped to fit over D-profile shafts. Use them to precisely align, level, and adjust spacing.

Shim Sets for Keyed Shafts

Be prepared with shims in a variety of thicknesses. Also known as arbor spacers, these shims are notched to fit over keyed shafts.

Shims for Ball Bearing Housings

Also called tolerance rings, these rings are for use in stamped, molded, or worn housings to form a tight hold on the bearings.

Shims for Keyed Shafts

Precisely shaped to fit snugly on keyed shafts, these shims align, level, and space components. Because of their tight fit, they also help components rotate in unison with the shaft.

Shims for Ball Bearings

Adjust spacing between bearings and other components on shafts. These shims are sized to fit the outer rim of a bearing.

Shims for Button Dies

Place these shims under sharpened dies to restore their original height and extend their life.

Unthreaded Inserts

Steel Unthreaded Inserts for Plastic

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

Aluminum Unthreaded Inserts for Plastic

These aluminum inserts are lightweight, nonmagnetic, and mildly corrosion resistant.

Brass Unthreaded Inserts for Plastic

Made from brass, these inserts are nonmagnetic, mildly corrosion resistant, and electrically conductive.

Unthreaded Inserts for Metal

Protect bolts from sideways (shear) pressure.

Threaded Rods and Studs

Hex Drive Threaded Rods

A hex drive on one end allows these rods to be turned with a hex key for ease of installation.

Hollow Female Threaded Rods

Connect and separate threaded rods, studs, and other components. These hollow rods have internal threads on both ends, so you can make connections and still pass wiring and other objects through the center of the rod.

Fastener Assortments

Ring Shim Assortments

Use round shims to precisely align, level, and adjust spacing on shafts and machinery.

Shim Assortments for Shortening Shoulder Screws

Slide onto a shoulder screw to shorten the length of the shoulder.

Shim Assortments for Lengthening Shoulder Screws

Spin these tight-fitting shims onto your screw's threads to lengthen the shoulder.

Shim Assortments for Button Dies

Place these shims under sharpened dies to restore their original height and extend the life of the dies.

SAE Washer Assortments

SAE washers generally have a smaller ID and OD than USS washers.

Oversized Washer Assortments

These washers have exaggerated diameters and/or thicknesses for covering oversized holes or for use as spacers and levelers.

Washer Assortments

USS Washer Assortments

USS washers generally have a larger ID and OD than SAE washers.

Thread Adapters

Male Round Universal Thread
Adapters with Through Hole

Join two female-threaded parts of various thread types and sizes, while allowing air, liquids, wire, or other thin materials to pass through.

Metric-to-Metric Male Round Thread Adapters

Left-Hand to Right-Hand Male Thread Adapters

Inch-to-Inch Male Round Thread Adapters

Inch-to-Metric Male Round Thread Adapters

Slotted-Drive Male-Female Round Thread Adapters

Male-Female Round Universal
Thread Adapters with Through Hole

Connect male- and female-threaded parts of different thread types and sizes, while allowing air, liquids, wire, or other thin materials to pass through.

Round Coupling Nuts

A smooth rounded body provides a finished look.

Clamping and Workholding

Press-Fit Drill Bushings

Made-to-Order Press-Fit Drill Bushings

Choose the ID, OD, and length you need.

Finish-Your-Own Press-Fit Drill Bushings

Larger OD tolerances than standard press-fit bushings allow for finishing. Bushings should be machine ground.

Metric Press-Fit Drill Bushings

Also known as jig bushings, these metric drill bushings fit inside fixture plate holes to guide drill bits, counterbores, reamers, and other cutting tools. They improve accuracy so that your drilled holes and cuts are consistent from part to part.

Made-to-Order Metric Press-Fit Drill Bushings

Choose the ID, OD, and length you need.

Corrosion-Resistant Press-Fit Drill Bushings

These bushings are made of stainless steel, which provides excellent corrosion resistance.

Wear-Resistant Press-Fit Drill Bushings

Made of durable tungsten carbide, these bushings outlast steel.

Metric Press-Fit Drill Bushings with Head

Even under extreme drilling pressure, these metric bushings won't press through your jig plate. A flanged head on the top of the bushing acts as a stop, preventing it from moving as you push down your drill bit, reamer, or other cutting bit.

Press-Fit Drill Bushings with Head

The head prevents these bushings from being pushed through the jig when drilling pressure is extreme. The head sits above the jig plate or can be mounted flush by installing in a counterbored hole.

Made-to-Order Press-Fit Drill Bushings with Head

Choose the ID, OD, and length you need.

Domed-Head Locating and Support Buttons

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

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.

Bumpers

Compressible-Stem Push-In Bumpers

The stem on these bumpers compresses to fit into tight holes. Push the stem into a hole for quick installation. These bumpers are commonly used as feet on instruments and bench-top equipment to keep them from sliding. They're also good as spacers between sheets of material. Also known as stem and grommet bumpers.

Push-In Bumpers

Push the stem into a hole for quick installation. These bumpers are commonly used as feet on instruments and bench-top equipment to keep them from sliding. They're also good as spacers between sheets of material. Also known as stem and grommet bumpers.

Tight-Grip Push-In Bumpers

A ridge on the stem provides a tighter grip than other push-in bumpers. Push the stem into a hole for quick installation. These bumpers are commonly used as feet on instruments and bench-top equipment to keep them from sliding. They're also good as spacers between sheets of material. Also known as stem and grommet bumpers.

Unthreaded Bumpers

Install these bumpers with screws. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces.

Heavy Duty Unthreaded Bumpers

All of these bumpers are reinforced with an embedded washer or base plate for strength. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces. They're also good for starting and stopping motion on automated machines. Install them with screws.

Load-Rated Unthreaded Bumpers

Select these bumpers for applications that require specific load capacities. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces. They're also good for starting and stopping motion on automated machines and conveyors. Install them with a screw.

Threaded Bumpers

Mount these bumpers on a threaded stud. All are reinforced with a steel core or base plate for strength. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces. They're also good for starting and stopping motion on automated machines.

High-Temperature Load-Rated Threaded-Stud Bumpers

These bumpers withstand temperatures up to 300° F, which is twice as high as our other load rated bumpers. Use them in applications that require specific load capacities. All are reinforced with a base plate for strength. Often used as feet, spacers, and vibration dampers, these bumpers absorb shock to prevent damage to equipment and surfaces. They're also good for starting and stopping motion on automated machines and conveyors. Twist them into a threaded hole.

Load-Rated Threaded-Stud Bumpers

Select these bumpers for applications that require specific load capacities. All are reinforced with a base plate for strength. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces. They're also good for starting and stopping motion on automated machines and conveyors. Twist these bumpers into a threaded hole.

High-Temperature Load-Rated Threaded Bumpers

These bumpers withstand temperatures up to 300° F, which is at least twice as high as our other load rated bumpers. Use them in applications that require specific load capacities. All are reinforced with a base plate for strength. Often used as feet, spacers, and vibration dampers, these bumpers absorb shock to prevent damage to equipment and surfaces. They're also good for starting and stopping motion on automated machines and conveyors. Mount them on a threaded stud.

Threaded-Stud Bumpers

Twist these bumpers into a threaded hole. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces.

Load-Rated Threaded Bumpers

Heavy Duty Threaded-Stud Bumpers

All of these bumpers are reinforced with a steel core for strength. Often used as feet, spacers, and vibration dampers, they absorb shock to prevent damage to equipment and surfaces. They're also good for starting and stopping motion on automated machines. Twist them into a threaded hole.

Adhesive-Back Bumpers

Press these bumpers into place with the adhesive backing. Use them as feet and spacers on instruments and small appliances to limit sliding, vibration, and noise. They're comparable to Bumpon bumpers.

Load-Rated Adhesive-Back Bumpers

Select these bumpers for applications that require specific load capacities. Use them as feet and spacers on instruments and small appliances to limit sliding, vibration, and noise. Press them into place with the adhesive backing. They're comparable to Bumpon bumpers.

Magnetic Bumpers

A magnetic base makes it easy to attach, move, and replace these bumpers on metal surfaces. Use them for guarding, aligning, and positioning parts.

Tack Bumpers

Install with a few taps of a hammer. In addition to protecting soft materials such as wood, fiberboard, and plastic, these bumpers are commonly used on table and chair legs to safeguard floors.

Bumper Assortments

Keep bumpers of various shapes, materials, and mounting styles on hand to solve whatever problems arise.

Connecting Rods

Internally Threaded Connecting Rods

Designed for use with right-hand, externally threaded rod ends, these rods have right-hand threads on both ends. Use them for remote valve operators, throttle controllers, shifting mechanisms, and virtually any push/pull assembly.

Connecting Rods

Designed for use with right-hand, internally threaded rod ends, these rods have right-hand threads on both ends. Use them for remote valve operators, throttle controllers, shifting mechanisms, and virtually any push/pull assembly.

Standoff Panel-Hanging Brackets

Screw-Grip Standoff Panel-Hanging Brackets

No need to drill holes in panels—tighten the set screw to hold them in place.

Two-Piece Standoff Panel-Hanging Brackets

Fit these brackets through drilled holes in panels.

Peg-Style Standoff Panel-Hanging Brackets

Use four brackets to support the top and bottom edges of panels without drilling holes in them.

Corrosion-Inhibiting Washers for Battery Terminals

Stop corrosion caused by battery acid fumes leaking at the posts of battery terminals.

Threaded Standoff Caps

Give open-ended standoffs a finished look and protect them from dirt and debris.