Side-by-Side Comparison
Washers & Retaining Rings
Flat Washers vs. Retaining Rings & Circlips
Comparing 2 standards across 19 specifications. 19 key differences identified.
Comparing:
Flat Washers
Retaining Rings & Circlips
Standard flat washers distribute fastener clamp load and prevent surface embedding, standardized under DIN 125 (ISO 7089 Form A metric without chamfer) and ASME B18.22.1 (Type A Narrow, Regular, and Wide series in imperial sizes).
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
19 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
DIN 125 Form A (ISO 7089) / ASME B18.22.1 Type A | DIN 471 (External) / DIN 472 (Internal) / DIN 6799 (E-Clip) |
|
M3 Flat Washer
|
ID: 3.2 mm | OD: 7.0 mm | Thickness: 0.5 mm | — |
|
M4 Flat Washer
|
ID: 4.3 mm | OD: 9.0 mm | Thickness: 0.8 mm | — |
|
M5 Flat Washer
|
ID: 5.3 mm | OD: 10.0 mm | Thickness: 1.0 mm | — |
|
M6 Flat Washer
|
ID: 6.4 mm | OD: 12.0 mm | Thickness: 1.6 mm | — |
|
M8 Flat Washer
|
ID: 8.4 mm | OD: 16.0 mm | Thickness: 1.6 mm | — |
|
M10 Flat Washer
|
ID: 10.5 mm | OD: 20.0 mm | Thickness: 2.0 mm | — |
|
M12 Flat Washer
|
ID: 13.0 mm | OD: 24.0 mm | Thickness: 2.5 mm | — |
|
1/4" ASME Type A
|
ID: 0.281 in (7.1 mm) | OD: 0.625 in (15.9 mm) | Thickness: 0.065 in (1.65 mm) | — |
|
3/8" ASME Type A
|
ID: 0.406 in (10.3 mm) | OD: 0.812 in (20.6 mm) | Thickness: 0.065 in (1.65 mm) | — |
|
1/2" ASME Type A
|
ID: 0.531 in (13.5 mm) | OD: 1.062 in (27.0 mm) | Thickness: 0.095 in (2.41 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 |