In the automotive industry, the performance of even the smallest component can determine the safety, durability, and efficiency of the entire vehicle. As a trusted custom fastener manufacturer, we’ve worked with clients across Europe, South America, and Asia, and we've identified the Top 5 fastener features that matter most in real-world automotive applications.

Here's how we help our customers solve their toughest fastening challenges:

1. Anti-Loosening Functionality

The challenge: Vehicles experience constant vibration, shock, and motion — making loosening a critical concern.

Our solution: We produce a wide range of anti-vibration and self-locking nuts, including nylon insert lock nuts, all-metal lock nuts, and wedge-lock washers. With precision thread rolling and torque control, we help reduce maintenance and improve assembly reliability in suspension and engine applications.

2. High Temperature Resistance

The challenge: Components near engines or exhaust systems must withstand extreme heat over long periods.

Our solution: We use heat-resistant alloys such as A286, stainless steel 316, and treated carbon steel. Our fasteners go through advanced heat treatment and are tested for thermal cycling and mechanical performance under high temperatures, ensuring they hold up in the most demanding automotive environments.

3. Corrosion Resistance

The challenge: Exposure to moisture, salt, and chemicals leads to fastener failure through corrosion — especially in coastal and cold regions.

Our solution: We offer multiple surface treatments including zinc-nickel plating, hot-dip galvanizing, Dacromet coating, and custom passivation. These finishes provide superior corrosion protection, meeting the salt spray testing requirements of leading OEMs.

4. Non-Standard Head Shapes & Custom Designs

The challenge: Many applications require tight clearances or special tool engagement, demanding custom geometries.

Our solution: From hexalobular (Torx) heads to low-profile, undercut, or captive head designs, our CNC and cold forging capabilities allow us to deliver precisely shaped fasteners for even the most unique engineering specifications. We support both prototype sampling and full-scale production.

5. Multi-Layer Surface Treatments

The challenge: Some fasteners must combine multiple properties — like insulation, conductivity, and corrosion resistance — in one part.

Our solution: Our team provides multi-step coating solutions, such as phosphate + zinc + sealant combinations, or electroplated + lubricated surfaces to optimize both installation torque and environmental performance. Each batch is verified with coating thickness, adhesion, and friction testing.

Why CNRL?

At CNRL Auto Parts, we don’t just manufacture fasteners — we engineer solutions for the real demands of your vehicles. From custom drawings to final inspection, we follow ISO/TS16949 standards and ship globally with stable lead times.

🚗 Whether you’re sourcing for OEM production or aftermarket support, we’re ready to be your fastener partner.

📩 Let’s talk about your custom needs. Get in touch today for a fast quote and technical consultation.