Technical Foundation
What Is a Retaining Washer?
Retaining washers hold a component axially in place on a shaft or inside a bore by engaging a groove or simply the shaft's outer surface, without requiring a threaded fastener. Push-on retaining washers snap directly onto an ungrooved shaft using spring tension from internal teeth or a curved profile, making them fast to install but generally lower in retained load capacity than groove-engaging styles. External E-clips (a type of retaining ring) seat into a machined groove on a shaft and provide a stronger, more defined axial stop, commonly used where a groove is already part of the shaft design.
Internal retaining washers perform the same function inside a bore rather than on a shaft, seating into an internal groove to retain a bearing, bushing or other component from moving axially within the housing. Material selection (spring steel, stainless steel) affects both corrosion resistance and the spring tension the washer can maintain over repeated installation cycles — installing and removing a retaining washer repeatedly can fatigue and weaken its retained grip over time.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Shaft/Bore Diameter | Sized to specific nominal shaft or bore diameter | Must match the shaft/bore exactly for correct retained grip or groove engagement |
| Retaining Style | Push-on (no groove) vs. groove-engaging E-clip | Push-on is faster to install; groove-engaging holds higher axial load reliably |
| Material | Spring steel, stainless steel | Stainless specified for corrosion resistance; spring steel is standard for general dry applications |
| Groove Depth/Width | Matched to ring thickness for groove-engaging styles | Incorrect groove dimensions reduce retained holding capacity or prevent proper seating |
| Axial Load Rating | Varies significantly by size and style | Determines the maximum thrust force the washer can hold before disengaging |
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Applications
Where Retaining Washers Get Used
Retaining washers are specified wherever a component needs to be held axially on a shaft or in a bore without the space or need for a threaded fastener.
Automotive & Machinery Shaft Assembly
Push-on retaining washers securing pulleys, gears and bushings on shafts during assembly and repair.
Bearing & Bushing Retention
Internal and external retaining washers holding bearings axially in place within housings and on shafts.
Electronics & Appliance Assembly
Small-diameter push-on washers retaining knobs, dials and small rotating components on thin shafts.
General Machine Assembly
E-clips and retaining washers used throughout equipment assembly wherever a threaded fastener isn't practical.
Hydraulic & Pneumatic Cylinder Assembly
Internal retaining washers seating and securing components within cylinder bores.
Fixture & Jig Component Retention
Retaining washers securing pins, bushings and locating components in custom fixtures and jigs.
FAQ
Retaining Washers Questions, Answered
What's the difference between a push-on retaining washer and an E-clip?
A push-on retaining washer snaps directly onto an ungrooved shaft using spring tension from internal teeth, making it fast to install but generally lower in retained load capacity. An E-clip (a groove-engaging retaining ring) seats into a machined groove on the shaft, providing a stronger, more clearly defined axial stop, but requires the shaft to already have a groove machined at the correct location.
Can retaining washers be reused after removal?
It depends on the style and how many install/remove cycles it's been through — repeated flexing during removal and reinstallation can fatigue and weaken a retaining washer's spring tension over time. For critical retention applications, replacing the washer after removal rather than reusing it is the safer practice.
How do I know what size retaining washer I need?
Measure the shaft or bore diameter precisely, and for groove-engaging styles, confirm the groove width and depth match the washer's specified dimensions — an undersized or oversized washer for the groove reduces retained holding capacity or may not seat correctly at all.
Do I need stainless steel or is spring steel adequate?
Spring steel is the standard, cost-effective choice for general dry indoor applications. Stainless steel is specified where the washer will be exposed to moisture, washdown, or corrosive environments, since spring steel will rust and lose spring tension faster under those conditions.
What tool do I need to install and remove retaining washers?
Groove-engaging retaining rings (E-clips and internal rings) typically require retaining ring pliers sized to the ring's diameter to safely expand or compress the ring for installation and removal. Push-on washers generally don't require special tools and can be pressed into place by hand or with a simple installation tool.
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