Round Rings | McMaster-Carr

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Links and Rings

Rings—Not for Lifting

Hang, pull, and secure loads. These rings are good for general non-lifting applications.

D-Rings—Not for Lifting

The flat side allows you to connect webbing and strapping, so they lay flat and resist bunching.

Pear-Shaped Links—Not for Lifting

Limit rope and chain movement with the narrow end of these links and attach multiple connectors to the wide end.

Oblong Links—Not for Lifting

Smaller than lifting oblong links, these links provide room for snaps, carabiners, and other non-lifting connectors.

Rings—For Lifting

Use these links for general lifting applications.

Oblong Links—For Lifting

Also known as master and sling links, a large inner diameter provides room to attach multiple connectors or legs on a sling.

Pear-Shaped Links—For Lifting

Limit rope and chain movement with the narrow end of these links and attach multiple connectors to the wide end.

Oblong Link Assemblies—For Lifting

Providing better load distribution and alignment than single oblong links, these reduce wear in three and four leg slings.

External Retaining Rings

Single-Turn Spiral External Retaining Rings

Slide these rings into place with one twist—no tools required—for applications with high thrust loads.

Heavy Duty Spiral External Retaining Rings

Thicker than standard spiral rings, these rings withstand greater forces.

Spiral External Retaining Rings

These coiled rings can be wound into place on a shaft without tools.

External Retaining Rings

Open these rings, pass them over the end of a shaft, and release to spring into the groove.

Heavy Duty External Retaining Rings

Thicker than standard external retaining rings, these rings withstand greater force.

Mil. Spec. External Retaining Rings

These rings meet military specification MS 16624.

Self-Locking External Retaining Rings

No groove is required for these rings—their thick profile helps them grip the shaft.

Inverted External Retaining Rings

For a smooth profile and better clearance than standard external retaining rings, the lugs on these rings point inward.

Bowed External Retaining Rings

The curved design of these rings works like a spring, taking up play for a tight hold.

Low-Clearance External Retaining Rings

Also known as constant-section rings, these rings have open ends and a profile that does not taper like other external retaining rings. Use them with linear bearings on support rail shafts.

Push-On Retaining Caps

Use these caps to hold components in place and protect shaft ends.

Flanged Push-On External Retaining Rings

The wide flange provides better load distribution than standard external push rings and can be used to cover oversized holes. Also known as thread cutting nuts.

Rectangular Push-On External Retaining Rings

Also known as flat-style speed nuts, these have a large surface to distribute loads better than standard and flanged external push rings.

Push-On External Retaining Rings

No groove required—press these rings onto the end of a shaft for a firm grip.

Speared Ends External Retaining Rings

Often used with small engines, heavy equipment, and power transmission, these external retaining rings have speared ends to help you install and remove them.

Wide-Grip Side-Mount External Retaining Rings

Also known as poodle rings, these thick rings have "ears" that form a large retaining surface to withstand stronger forces than other side-mount retaining rings.

Side-Mount External Retaining Rings

Also known as E-style rings.

Low-Clearance Side-Mount External Retaining Rings

Also known as C-style and crescent rings, these rings have a small shoulder to fit in tight spaces.

Heavy Duty Side-Mount External Retaining Rings

These rings are reinforced to withstand faster rotation than other side‐mount retaining rings. Also known as reinforced E‐style rings.

Bowed Side-Mount External Retaining Rings

Also known as bowed E-style rings, these have a curved design that works like a spring, taking up play for a tight hold.

Crimp-On External Retaining Rings

Also known as X-washers, place these rings into the groove and squeeze tight with pliers to form a 360° closure.

Clip-On External Retaining Rings

Slide these rings into a groove near the end of the shaft and the tab locks them in place.

Internal Retaining Rings

Squeeze these rings to place them in the groove inside a bore or housing.

Internal Teeth Retaining Rings

With teeth along the inside, these retaining rings hold chamfered shafts inside the housing of your equipment.

Bowed Internal Retaining Rings

The curved design of these rings works like a spring, taking up play for a tight hold.

Inverted Internal Retaining Rings

For a smooth bore and better clearance than standard internal retaining rings, the lugs on these rings face outward.

Heavy-Duty Internal Retaining Rings

Thicker and stronger than standard internal retaining rings, these withstand greater thrust loads.

Single-Turn Spiral Internal Retaining Rings

Slide these rings into place by hand with a single twist for applications with high thrust loads.

Heavy Duty Spiral Internal Retaining Rings

Thicker than standard spiral rings, these rings withstand greater forces.

Spiral Internal Retaining Rings

These coiled rings can be wound into place inside a bore or housing without tools.

Push-On Internal Retaining Rings

No groove required—these rings have teeth that firmly grip the bore.

Cotter Pins

Cotter Rings

Twist these rings on to lock pins in place. They don't have the sharp ends of other cotter pins.

Split Rings

Also known as key rings, twist these rings into place to secure clevis pins, connect components, or add a pull handle. They don't have the sharp ends of other cotter pins.

Fastener Assortments

Split Ring Assortments

Side-Mount External Retaining Ring Assortments

Also known as E-Style and C-style rings, slide these into the groove from the side of the shaft. They provide a wider shoulder than other external retaining rings for a larger retaining surface.

External Retaining Ring Assortments

Pull these rings open with retaining ring pliers, pass over the end of a shaft, and release to spring into a groove.

External and Side-Mount Retaining Ring Assortments

Assortments include pliers to install external rings.

External and Internal Spiral Retaining Ring Assortments

Wind these retaining rings into a groove—no tools required for installation.

Internal Retaining Ring Assortments

Pull ring ends together with retaining ring pliers and place into the bore of a shaft or housing.

External, Internal, and Side-Mount
Retaining Ring Assortments

These assortments include pliers to install external and internal rings.

External and Internal Retaining Ring Assortments

Assortments include pliers to install external and internal rings.

Internal Push Ring Assortments

External Push Ring Assortments

Round Push Nuts

With flexible teeth that slide smoothly over threads of any pitch, these push nuts can be used alone for light-duty applications or as a jam nut.

Metric Round Push Nuts

These metric push nuts can be used as a standalone for light-duty applications or as a jam nut.

Piston Seals

Piston Cup Seals

These Buna-N seals are reinforced with cotton thread for strength.

High-Speed Piston Seals

PTFE gives these seals a slippery surface that allows rod speeds more than two times faster than our other piston seals.

High-Stability High-Speed Piston Seals

A square O-ring prevents these piston seals from rocking in the groove.

Piston Seals for O-Ring Grooves

Avoid common O-ring failure in dynamic applications—the square base of these seals prevents twisting, while backup rings protect against extrusion.

High-Pressure Piston Seals

Rated for pressure up to 10,000 psi, these seals withstand the highest pressure of our piston seals.

Dual-Purpose Rod and Piston Seals

O-Ring-Loaded U-Cup Seals

Also known as loaded-lip seals and PolyPaks, an O-ring secures these U-cups to the rod or piston for better sealing performance at lower pressures than unsupported U-cup seals.

High-Stability O-Ring-Loaded U-Cup Seals

Also known as Type B seals, these U-cups are wider than our other O-ring-loaded U-cup seals for better stability and fit in wider grooves.

Spring-Loaded Seals

In addition to providing excellent sealing performance at low pressure, these seals withstand a wider range of temperatures and chemicals than U-cup seals. They’re also known as spring-energized seals.

High-Pressure Leather U-Cup Seals

Rated for pressure up to 10,000 psi, these leather U-cups handle over 80 times more pressure than our Buna-N U-cups.

Buna-N U-Cup Seals

These U-cup seals create less friction than O-ring-loaded U-cups, so they wear more slowly. Also known as lip seals, U-cups have a sealing lip on both the inside and outside edges, so they can be used for rod and piston sealing.

Rod Seals

High-Speed Rod Seals

The slippery PTFE surface of these seals allows rod motion up to seven times faster than our other rod seals.

Rod Seals

These seals have a beveled lip that optimizes contact against the rod, while a secondary lip keeps the seal stable.

Rod Seals for O-Ring Grooves

Avoid common O-ring failure in dynamic applications—the square base of these seals prevents twisting, while backup rings protect against extrusion.

Air-Powered Cylinder Cushioning Seals

For use in air-powered cylinders, these seals prevent the piston from slamming against the cylinder body to minimize wear and noise.

High-Speed Hydraulic Cylinder Buffering Seals

PTFE gives these seals a slippery surface that facilitates rod speeds over seven times faster than our other buffering seals. They're rated for pressure up to 5,000 psi.

High-Pressure Hydraulic Cylinder Buffering Seals

Rated for pressure up to 10,000 psi, these seals withstand the highest pressure of our buffering seals.

Head Seals

Replace the standard O-ring/backup ring combination with a more reliable alternative—these head seals resist twisting and remain stable even in applications with fluctuating pressure.

Rod Wipers

These rod wipers are also known as U-type wipers.

Rod-Sealing Wipers

A two-lip design means that these wipers also function as a rod seal.

Cylinder-Sealing Rod Wipers

These wipers seal against the cylinder housing to prevent contaminants from entering between the outside edge and the housing.

High-Speed Rod Wipers

Made from MDS-filled PTFE for a slippery surface, these wipers allow rods to move three times faster than other rod wipers.

Rod Wipers for Open Grooves

Replace wipers in open-groove cylinders—these wipers have an integral steel case so they press fit into the groove around the rod.

Wear Rings

High-Speed Wear Rings

Made from PTFE, these wear rings have a slippery surface that allows rods to move at least three times faster than nylon wear rings.

Wear Rings

Made from glass-filled nylon for excellent wear resistance and strength.

Wear Ring Stock

Cut this stock to make wear rings that fit any rod or bore diameter.

Rotary Shaft Seals

Rotary Shaft Seals for Grease

Also known as grease seals, these are designed to retain thick lubricant at low pressure. They have a light grip on the shaft that creates less friction than spring-loaded seals.

Spring-Loaded Rotary Shaft Seals with Wiper Lip

These seals have a metal case that creates a tight seal when mating with smooth surfaces.

Bore-Sealing Spring-Loaded
Rotary Shaft Seals with Wiper Lip

Ribbed Buna-N over steel creates a tight seal with the bore, even when mating with a rough surface or in a split housing.

Spring-Loaded Rotary Shaft Seals for Misaligned Shafts

Designed with an extended lip, these seals have the flexibility to accommodate shaft misalignment up to 0.125". They're also known as clipper seals.

Spring-Loaded Rotary Shaft Seals

Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. A spring secures the lip against the shaft, preventing messy leaks. Press-fit seals into the bore around the shaft.

High-Speed Rotary Shaft Seals

A slippery PTFE surface allows these seals to function at speeds at least 25% faster than other rotary shaft seals.

Split Rotary Shaft Seals

Swap out old seals without disassembling components—these seals come split for easy installation. They're also known as clipper seals.

Heavy Duty Shaft-Mounted Rotary Seals

These seals are fluoroelastomer, so they have excellent chemical resistance and withstand temperatures up to 390° F.

Shaft-Mounted Rotary Seals

Made from Buna-N for excellent resistance to oil and grease.

Mechanical Pump Shaft Seals with Extended Spring

An extended spring on these seals accommodates variations in seal cavity length and pump misalignment.

Narrow-Profile Mechanical Pump
Shaft Seals with Extended Spring

With a smaller seal OD than standards seals, these seals have an extended spring that accommodates variations in seal cavity length.

Mechanical Pump Shaft Seals with Compact Spring

Built for small circulation and dispensing pumps, these seals have short springs.

Heavy Duty Mechanical Pump Shaft Seals

Multiple internal springs ensure these seals keep the sealing surfaces in contact in demanding applications, such as agricultural, chemical, and mining pumps.

Mechanical Pump Shaft Seals

These seals are commonly used in well, sump, and displacement pumps.

Mechanical Shaft Seals

Commonly used in mixing and grinding equipment, conveyors, and construction machinery, these two-part seals withstand exposure to abrasive material.

Stackable V-Ring Packing Seals

PTFE Stackable V-Ring Packing Seals

PTFE has excellent chemical resistance and withstands a wide temperature range of -110° F to 500° F.

High-Pressure Leather Stackable V-Ring Packing Seals

These leather V-ring packing seals handle over twice the pressure as PTFE. Leather is tough, pliable, and wear resistant, so it flexes to fit uneven surfaces and fill voids.

Tag Rings

Loop these rings onto tags.

Locking Tag Rings

Choose from twisting, threading, cinching, and other locking mechanisms.

Colored Tag Ring Assortments

Includes a black, blue, green, purple, and red tag ring.

Links and Rings

Rings—Not for Lifting

D-Rings—Not for Lifting

Pear-Shaped Links—Not for Lifting

Oblong Links—Not for Lifting

Rings—For Lifting

Oblong Links—For Lifting

Pear-Shaped Links—For Lifting

Oblong Link Assemblies—For Lifting

External Retaining Rings

Single-Turn Spiral External Retaining Rings

Heavy Duty Spiral External Retaining Rings

Spiral External Retaining Rings

External Retaining Rings

Heavy Duty External Retaining Rings

Mil. Spec. External Retaining Rings

Self-Locking External Retaining Rings

Inverted External Retaining Rings

Bowed External Retaining Rings

Low-Clearance External Retaining Rings

Push-On Retaining Caps

Flanged Push-On External Retaining Rings

Rectangular Push-On External Retaining Rings

Push-On External Retaining Rings

Speared Ends External Retaining Rings

Wide-Grip Side-Mount External Retaining Rings

Side-Mount External Retaining Rings

Low-Clearance Side-Mount External Retaining Rings

Heavy Duty Side-Mount External Retaining Rings

Bowed Side-Mount External Retaining Rings

Crimp-On External Retaining Rings

Clip-On External Retaining Rings

Internal Retaining Rings

Internal Retaining Rings

Internal Teeth Retaining Rings

Bowed Internal Retaining Rings

Inverted Internal Retaining Rings

Heavy-Duty Internal Retaining Rings

Single-Turn Spiral Internal Retaining Rings

Heavy Duty Spiral Internal Retaining Rings

Spiral Internal Retaining Rings

Push-On Internal Retaining Rings

Cotter Pins

Cotter Rings

Split Rings

Fastener Assortments

Split Ring Assortments

Side-Mount External Retaining Ring Assortments

External Retaining Ring Assortments

External and Side-Mount Retaining Ring Assortments

External and Internal Spiral Retaining Ring Assortments

Internal Retaining Ring Assortments

External, Internal, and Side-MountRetaining Ring Assortments

External and Internal Retaining Ring Assortments

Internal Push Ring Assortments

External Push Ring Assortments

Round Push Nuts

Round Push Nuts

Metric Round Push Nuts

Piston Seals

Piston Cup Seals

High-Speed Piston Seals

High-Stability High-Speed Piston Seals

Piston Seals for O-Ring Grooves

High-Pressure Piston Seals

Dual-Purpose Rod and Piston Seals

O-Ring-Loaded U-Cup Seals

High-Stability O-Ring-Loaded U-Cup Seals

Spring-Loaded Seals

High-Pressure Leather U-Cup Seals

Buna-N U-Cup Seals

Rod Seals

High-Speed Rod Seals

Rod Seals

Rod Seals for O-Ring Grooves

Air-Powered Cylinder Cushioning Seals

High-Speed Hydraulic Cylinder Buffering Seals

High-Pressure Hydraulic Cylinder Buffering Seals

Head Seals

Rod Wipers

External, Internal, and Side-Mount
Retaining Ring Assortments

Bore-Sealing Spring-Loaded
Rotary Shaft Seals with Wiper Lip

Narrow-Profile Mechanical Pump
Shaft Seals with Extended Spring