Customisable Cup Washers Galvanized Carbon Steel Cup Washer for Screw and Nut

Beschreibung

What Are Cup Washers?

Cup washers (also called dome washers or curved washers) are specialized washers with a concave or cup-shaped design. They are used to distribute load, prevent fastener pull-through, and provide a smooth bearing surface in applications where a flat washer would not suffice. Their curved shape helps maintain tension and reduces stress on soft or fragile materials.

Materials of Cup Washers

1. Steel (Carbon steel, Stainless steel) – High strength, corrosion-resistant (stainless steel preferred for outdoor use).

2. Aluminum – Lightweight, corrosion-resistant, used in aerospace and electronics.

3. Brass – Corrosion-resistant, non-sparking, used in electrical and marine applications.

4. Nylon/Plastic – Insulating, lightweight, used in electronics and non-conductive applications.

Surface Treatments

1. Zinc Plating – Common for steel washers, improves corrosion resistance.

2. Galvanization – Extra corrosion protection for harsh environments.

3. Anodizing (for aluminum) – Enhances durability and appearance.

4. Passivation (for stainless steel) – Removes surface contaminants, improves rust resistance.

5. Powder Coating – Adds color and extra protection (used in architectural applications).

Specifications

• Inner Diameter (ID): Matches bolt size (e.g., M4, M6, 1/4″, 3/8″).

• Outer Diameter (OD): Typically 1.5x to 3x the bolt diameter.

• Thickness: Varies (e.g., 1mm to 5mm).

• Shape: Concave (cup depth varies for different load distributions).

Applications

• Construction: Roofing, cladding, and metal framing to prevent fastener pull-through.

• Automotive: Securing upholstery, trim panels, and wiring harnesses.

• Electronics: Protecting PCB mounts and insulating connections.

• Furniture: Reinforcing joints in particleboard or MDF.

• Marine: Preventing corrosion in saltwater environments (stainless steel or brass).

Excellent Case: Solar Panel Mounting

Scenario: A solar energy company needs to secure photovoltaic panels to aluminum roof rails without damaging the thin panel frames.

Solution:

1. Material Choice: Stainless steel cup washers (corrosion-resistant, durable).

2. Installation:

   • Cup washers are placed under bolt heads when attaching solar panels to mounting rails.

   • The concave shape distributes clamping force evenly, preventing frame deformation.

3. Result:

   • The panels remain securely fastened even under wind and thermal expansion.

   • No cracking or stress fractures in the aluminum frames.

Benefits:
✔ Prevents material damage – Distributes load over a wider area.
✔ Weather-resistant – Stainless steel withstands rain, UV, and temperature changes.
✔ Long-term reliability – Reduces maintenance needs in solar farms.