Side-by-Side Comparison
Washers & Retaining Rings
Fender Washers vs. Retaining Rings & Circlips
Comparing 2 standards across 18 specifications. 18 key differences identified.
Comparing:
Fender Washers
Retaining Rings & Circlips
Fender washers feature an oversized outer diameter approximately three times larger than their central hole (e.g. 1/4" ID × 1.0" to 1.25" OD), designed to bridge enlarged holes and distribute clamping force across thin sheet metal, automotive panels, and wood.
Retaining rings (circlips) provide removable shoulder stops in machined shaft and bore grooves, standardized under DIN 471 (External shaft circlips), DIN 472 (Internal bore circlips), and DIN 6799 (Radial E-clips).
Specification Comparison Table
18 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
ASME B18.22.1 (Large Diameter Flat Washers) / SAE J485 | DIN 471 (External) / DIN 472 (Internal) / DIN 6799 (E-Clip) |
|
Defining Characteristic
|
Outer diameter is ~3× to 4× the inner bolt diameter | — |
|
3/16" × 1.0" Fender Washer
|
ID: 0.219 in (5.6 mm) | OD: 1.00 in (25.4 mm) | Thickness: 0.050 in (1.27 mm) | — |
|
1/4" × 1.0" Fender Washer
|
ID: 0.281 in (7.1 mm) | OD: 1.00 in (25.4 mm) | Thickness: 0.062 in (1.57 mm) | — |
|
1/4" × 1.25" Fender Washer
|
ID: 0.281 in (7.1 mm) | OD: 1.25 in (31.8 mm) | Thickness: 0.062 in (1.57 mm) | — |
|
1/4" × 1.50" Fender Washer
|
ID: 0.281 in (7.1 mm) | OD: 1.50 in (38.1 mm) | Thickness: 0.062 in (1.57 mm) | — |
|
5/16" × 1.25" Fender Washer
|
ID: 0.344 in (8.7 mm) | OD: 1.25 in (31.8 mm) | Thickness: 0.062 in (1.57 mm) | — |
|
5/16" × 1.50" Fender Washer
|
ID: 0.344 in (8.7 mm) | OD: 1.50 in (38.1 mm) | Thickness: 0.062 in (1.57 mm) | — |
|
3/8" × 1.50" Fender Washer
|
ID: 0.406 in (10.3 mm) | OD: 1.50 in (38.1 mm) | Thickness: 0.062 in (1.57 mm) | — |
|
1/2" × 2.00" Fender Washer
|
ID: 0.531 in (13.5 mm) | OD: 2.00 in (50.8 mm) | Thickness: 0.078 in (1.98 mm) | — |
|
DIN 471 10mm External Circlip
|
— | Shaft Dia: 10 mm | Groove Dia: 9.6 mm | Groove Width: 1.1 mm | Ring Thickness: 1.0 mm |
|
DIN 471 15mm External Circlip
|
— | Shaft Dia: 15 mm | Groove Dia: 14.3 mm | Groove Width: 1.1 mm | Ring Thickness: 1.0 mm |
|
DIN 471 20mm External Circlip
|
— | Shaft Dia: 20 mm | Groove Dia: 19.0 mm | Groove Width: 1.3 mm | Ring Thickness: 1.2 mm |
|
DIN 471 25mm External Circlip
|
— | Shaft Dia: 25 mm | Groove Dia: 23.9 mm | Groove Width: 1.3 mm | Ring Thickness: 1.2 mm |
|
DIN 472 20mm Internal Circlip
|
— | Bore Dia: 20 mm | Groove Dia: 21.0 mm | Groove Width: 1.1 mm | Ring Thickness: 1.0 mm |
|
DIN 472 25mm Internal Circlip
|
— | Bore Dia: 25 mm | Groove Dia: 26.2 mm | Groove Width: 1.3 mm | Ring Thickness: 1.2 mm |
|
DIN 6799 E-Clip (Radial Installation)
|
— | Installed radially with push tool without requiring axial shaft access |
|
Standard Material
|
— | Spring Steel (C67S / C75S / 50CrV4) hardened to 44–53 HRC, Stainless AISI 301/304 |