Side-by-Side Comparison
Washers & Retaining Rings
Belleville Washers vs. Flat Washers
Comparing 2 standards across 17 specifications. 17 key differences identified.
Comparing:
Belleville Washers
Flat Washers
The Belleville Washer (Conical Disc Spring / Cupped Spring Washer, standardized under DIN 2093 and DIN 6796) is a conical annular spring disc engineered to deliver massive axial spring clamping force across sub-millimeter deflection distances, maintaining bolted joint tension under extreme thermal expansion and dynamic vibration.
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).
Specification Comparison Table
17 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard Specifications
|
DIN 2093 (Precision disc springs) / DIN 6796 (Heavy-duty bolted joints) / ISO 19643 | — |
|
Conical Geometry
|
Frusto-conical cup shape (cone height ≈ 0.5× to 0.7× disc thickness) | — |
|
Load Capacity
|
Extreme axial spring force (thousands of newtons in sub-millimeter stroke) | — |
|
Stacking Capabilities
|
Parallel Stacking (nests together to multiply load) or Series Stacking (tips touch to multiply deflection) | — |
|
Standard Materials
|
51CrV4 chrome-vanadium spring steel / 17-7 PH stainless / Inconel 718 (high temp) | — |
|
Primary Applications
|
High-voltage electrical busbars, engine cylinder heads, cryogenic piping, wind turbine bolts | — |
|
Governing Standards
|
— | DIN 125 Form A (ISO 7089) / ASME B18.22.1 Type A |
|
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) |