Side-by-Side Comparison
Washers & Retaining Rings
Fender Washers vs. Sealing & Crush Washers
Comparing 2 standards across 18 specifications. 18 key differences identified.
Comparing:
Fender Washers
Sealing & Crush Washers
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.
Sealing crush washers create leak-tight fluid seals under compression on hydraulic fittings and automotive drain plugs, standardized under DIN 7603 (Form A solid copper/aluminum, Form C copper-asbestos/elastomer, and bonded Dowty seals).
Specification Comparison Table
18 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
ASME B18.22.1 (Large Diameter Flat Washers) / SAE J485 | DIN 7603 Form A (Solid) / ISO 1179 / SAE J514 |
|
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) | — |
|
M10 Sealing Washer (DIN 7603)
|
— | ID: 10.0 mm | OD: 14.0 mm | Thickness: 1.0 mm (Copper / Aluminum) |
|
M12 Sealing Washer (Oil Drain Plug)
|
— | ID: 12.0 mm | OD: 16.0 mm to 18.0 mm | Thickness: 1.5 mm |
|
M14 Sealing Washer (Standard Oil Drain)
|
— | ID: 14.0 mm | OD: 18.0 mm to 20.0 mm | Thickness: 1.5 mm |
|
M16 Sealing Washer (Gearbox/Diff)
|
— | ID: 16.0 mm | OD: 22.0 mm | Thickness: 1.5 mm |
|
M18 Sealing Washer
|
— | ID: 18.0 mm | OD: 24.0 mm | Thickness: 1.5 mm |
|
M22 Sealing Washer
|
— | ID: 22.0 mm | OD: 27.0 mm | Thickness: 1.5 mm |
|
Bonded Dowty Seal (Metal + NBR/FKM)
|
— | Steel outer ring with vulcanized inner trapezoidal elastomeric lip (Self-centering) |
|
Plastic Yield Mechanism
|
— | Ductile copper/aluminum crushes plastically into machining micro-grooves upon torquing |