Side-by-Side Comparison
Washers & Retaining Rings
Lock Washers vs. Sealing & Crush Washers
Comparing 2 standards across 16 specifications. 16 key differences identified.
Comparing:
Lock Washers
Sealing & Crush Washers
Lock washers resist bolt loosening under vibration through spring preload and mechanical biting, standardized under DIN 127 (helical split spring washers), DIN 6798 (internal/external serrated tooth star washers), and DIN 2093 (Belleville conical spring discs).
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
16 Parameters| Parameter / Spec | ||
|---|---|---|
|
Governing Standards
|
DIN 127 Form B / DIN 6798 / DIN 2093 / ASME B18.21.1 | DIN 7603 Form A (Solid) / ISO 1179 / SAE J514 |
|
Helical Split Washer Mechanism
|
Spring tension + sharp trapezoidal edges that bite into mating surfaces under counter-rotation | — |
|
M6 DIN 127 Split Lock Washer
|
ID: 6.1 mm | OD: 11.8 mm | Thickness (s): 1.6 mm | Uncompressed Free Height: ~3.2 mm | — |
|
M8 DIN 127 Split Lock Washer
|
ID: 8.1 mm | OD: 14.8 mm | Thickness (s): 2.0 mm | Uncompressed Free Height: ~4.0 mm | — |
|
M10 DIN 127 Split Lock Washer
|
ID: 10.2 mm | OD: 18.1 mm | Thickness (s): 2.2 mm | Uncompressed Free Height: ~4.4 mm | — |
|
M12 DIN 127 Split Lock Washer
|
ID: 12.2 mm | OD: 21.1 mm | Thickness (s): 2.5 mm | Uncompressed Free Height: ~5.0 mm | — |
|
Belleville Disc Spring (DIN 2093)
|
Conical shape maintains thousands of pounds of preload over high thermal expansion cycles | — |
|
Serrated Tooth Star Washer (DIN 6798)
|
Multiple teeth bite through paint/anodizing to ensure electrical bonding and ground continuity | — |
|
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 |