Views: 0 Author: ZHE Publish Time: 2025-09-26 Origin: Site
The countersunk washers are important fastening component parts that can distribute pressure and protect the surface. The head of the screw is flush with the countersunk hole.
Unlike ordinary washers, the conical design eliminates the protruding part. It's mainly used in scenarios that emphasize both aesthetics and safety. It‘s widely applied in various fields ranging from furniture to automobiles and industrial machinery.
This guide covers the key topics: material selection (stainless steel, steel), customization options, size chart, surface treatment, advantages of Chinese factory, and rapid prototyping services.
Countersunk washer is a washer with a conical design, whose angle matches the angle of the countersunk hole (usually 82° or 90°). Its main function is to distribute the load of screws or bolts, prevent surface damage, and ensure that the head of the fastener remains embedded.
They are suitable for prominent areas (such as cabinets) or mechanical equipment, because in these places, the protruding head may get stuck by debris. Unlike ordinary flat washers, countersunk washers focus on a seamless fit and are important components in daily life.
Material selection directly impacts a countersunk washer’s durability and performance. The two most common options are stainless steel and steel—each suited to specific environments. Below is a detailed comparison to help you choose.
| Feature | Stainless Steel Countersunk Washers | Steel Countersunk Washers |
|---|---|---|
| Corrosion Resistance | High (resists rust, moisture, chemicals) | Low (needs finishes for rust protection) |
| Load Capacity | Moderate to high | High (ideal for heavy loads) |
| Ideal Applications | Outdoor projects, marine, food equipment | Indoor machinery, construction (with finishes) |
| Cost Range | Mid-range | Budget-friendly |
| Durability | Long-lasting (resists wear) | Durable but prone to rust without treatment |
The countersunk washers in stock may not be suitable for special projects - but we can customize the countersunk washers. Chinese factories are skilled at providing tailor-made solutions, including non-standard sizes (with excessive outer diameter), unique inner hole shapes, or custom taper (for example, a 60° taper for specific machinery).
Whether you need gaskets for medical equipment (food-grade stainless steel) or for heavy industry (high-strength steel), the customization options can ensure a perfect match for your application.
Choosing the wrong size countersunk washer leads to loose fasteners or surface damage. A reliable countersunk washer size chart simplifies selection by linking nominal sizes to critical dimensions. Below is a sample chart for common applications.
| Nominal Size (M) | Inner Diameter (mm) | Outer Diameter (mm) | Thickness (mm) | Suitable Screw Sizes |
|---|---|---|---|---|
| M4 | 4.2 | 10.0 | 1.5 | M4 screws |
| M6 | 6.3 | 14.0 | 2.0 | M6 screws |
| M8 | 8.4 | 18.0 | 2.5 | M8 screws |
| M10 | 10.5 | 22.0 | 3.0 | M10 screws |
Finish countersunk washers combine functionality with visual appeal. Finishes add a protective layer against rust, corrosion, or wear, while enhancing appearance for visible applications. Common finishes include:
Zinc plating: Affordable rust protection for steel washers (ideal for indoor use).
Chrome plating: Shiny, scratch-resistant finish for decorative projects (e.g., furniture).
Passivation: Enhances stainless steel’s natural corrosion resistance (for outdoor/marine use).China factories offer customizable finishes to match your project’s requirements.
China factories are trusted global suppliers of countersunk washers for several reasons:
Cost competitiveness: Economies of scale and efficient production reduce costs without sacrificing quality.
Quality control: Most factories hold certifications (ISO 9001) for stainless steel and steel washers.
Customization: Fast turnaround for custom countersunk washers (unique sizes, finishes).
Rapid prototyping: Quick Sample (3–7 days) to test designs before mass production.
Production: Ability to fulfill bulk orders (10k+ units) for industrial clients.
Rapid prototyping is a game-changer for product development. China factories use advanced tools (CNC machining) to create small-batch countersunk washers quickly. This lets you:
Test fit and performance in real-world applications.
Adjust designs (e.g., size, material) without costly retooling.
Shorten time-to-market (cutting weeks from traditional prototyping).Typically, rapid samples for countersunk washers are ready in 3–7 days, with options for stainless steel or steel materials.
The countersunk washer has a gradually narrowing shape, which is suitable for embedded installation in countersunk holes, while the ordinary washer is flat and is used for the distribution of general loads (without the feature of embedded installation).
They offer high corrosion resistance, making them ideal for outdoor, marine, or food-grade applications where rust is a concern.
Match your screw’s nominal size (M6) to the chart’s “Nominal Size” column, then verify inner diameter (fits the screw shank) and outer diameter (fits your hole).
Yes—most China factories offer custom finishes (zinc, chrome) alongside tailored sizes or materials.
Typically 3–7 days, depending on material (stainless steel vs. steel) and design complexity.
Only if they have a protective finish (zinc plating)—unfinished steel will rust quickly outdoors.
Common options: zinc plating, chrome plating, passivation (stainless steel), and black oxide (for a matte look).
Yes—most hold ISO 9001 or SGS certifications, ensuring compliance with global quality standards for stainless steel and steel products.
