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Metric Flat Washers – 125A Zinc CR+3 Plated are precision-manufactured components used to evenly distribute clamping force under nuts, bolts, and other fasteners. Designed to metric standards (DIN 125A), these washers are ideal for general-purpose use in automotive, industrial, construction, and machinery applications.
These washers are made from carbon steel and coated with trivalent chromium (CR+3) zinc plating, which provides moderate corrosion resistance and a clean silver-blue finish. The CR+3 plating offers a more environmentally friendly alternative to hexavalent chromium, complying with RoHS and other global environmental standards.
Conforming to DIN 125A standard, these washers feature a smooth, burr-free surface, chamfered or radius-free edge, and precise tolerances, making them ideal for use with standard metric bolts and nuts in medium-load conditions.
Washer Size (Nominal Bolt Size) | Inside Diameter (mm) | Outside Diameter (mm) | Thickness (mm) | Material | Finish | Standard |
---|---|---|---|---|---|---|
M3 | 3.2 | 7.0 | 0.5 – 0.8 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M4 | 4.3 | 9.0 | 0.8 – 1.0 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M5 | 5.3 | 10.0 | 1.0 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M6 | 6.4 | 12.0 | 1.6 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M8 | 8.4 | 16.0 | 1.6 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M10 | 10.5 | 20.0 | 2.0 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M12 | 13.0 | 24.0 | 2.5 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M14 | 15.0 | 28.0 | 2.5 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M16 | 17.0 | 30.0 | 3.0 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M18 | 19.0 | 34.0 | 3.0 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M20 | 21.0 | 37.0 | 3.0 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M22 | 23.0 | 39.0 | 3.0 – 3.5 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M24 | 25.0 | 44.0 | 4.0 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M27 | 28.0 | 50.0 | 4.0 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
M30 | 31.0 | 56.0 | 4.0 – 4.5 | Carbon Steel | Zinc Plated CR+3 | DIN 125A |
Standard: DIN 125A (ISO 7089 equivalent)
Material: Mild carbon steel (typically SAE 1008–1010)
Finish: Zinc plated with trivalent chromium (CR+3) – RoHS compliant
Corrosion Resistance: Moderate (for dry indoor or mild outdoor environments)
Hardness: Rockwell B50–B70 (depending on size and thickness)
Applications: Fastening reinforcement