Frequently Asked Questions About Freightliner FLC120 Frame Nut Covers

What material are these frame nut covers made from, and will they rust or corrode over time?

Our Freightliner FLC120 frame nut covers are manufactured from either chrome-plated ABS plastic or 304-grade stainless steel, depending on the specific model you choose. The chrome-plated ABS options provide excellent durability and shine at a more affordable price point, while maintaining resistance to road chemicals and weather. The stainless steel versions offer superior corrosion resistance and longevity, especially in harsh winter conditions with road salt exposure. Both materials are designed to withstand years of highway use without rusting or significant deterioration.

Will these frame nut covers fit my specific year FLC120, and are there different sizes available?

These frame nut covers are designed to fit Freightliner FLC120 models from 1989 through 2003. The standard size fits 33mm lug nuts, which is the most common size on FLC120 trucks. However, we also carry 1.5-inch (38mm) covers for trucks with larger lug nuts. Before ordering, we recommend measuring your lug nuts with a socket or wrench to ensure proper fitment. The covers are designed with a universal push-on installation that accommodates slight variations in nut heights.

How difficult is the installation process, and what tools will I need?

Installation is straightforward and typically takes 30-45 minutes for a complete set. No special tools are required - just a clean rag and possibly some rubbing alcohol for cleaning the nuts beforehand. The covers feature a push-on design with internal retention tabs that grip the lug nuts securely. For best results, clean each lug nut thoroughly to remove dirt and grease, then firmly push each cover straight onto the nut until you hear or feel it click into place. Some drivers find it helpful to use a rubber mallet with a soft cloth for stubborn covers, though hand pressure is usually sufficient.

What styles and finishes are available, and which looks best with my truck?

We offer frame nut covers in three primary finishes: mirror-polished chrome, brushed stainless steel, and powder-coated black. The chrome finish provides the classic, high-shine look that complements chrome bumpers and accessories. Brushed stainless offers a more subtle, professional appearance that hides fingerprints and minor scratches better. Black powder-coated options are ideal for trucks with blacked-out themes or darker trim packages. We also carry pointed, rounded dome, and flat-top styles to match your personal preference and existing wheel accessories.

How many covers come in a set, and will I need to order multiple sets for my truck?

Frame nut covers are typically sold in sets of 10 or 20 pieces. A standard FLC120 with dual rear wheels requires 30 covers total (6 for the front axle and 24 for the rear axles). Single rear wheel configurations need 18 covers total. We recommend counting your visible lug nuts before ordering to ensure you purchase the correct quantity. Many customers order an extra set of 10 as spares, since individual covers can occasionally come loose or get damaged during tire service.