The Core4 Flug is engineered to deliver the highest level of lug nut performance, focusing on the single most critical function of any wheel fastener: creating consistent stud tension (stud preload / clamping force).

Manufactured in the USA from hardened alloy steel, these high-strength lug nuts are built for durability, precision, and repeatable performance. The patented floating collar design eliminates aluminum-to-steel friction at the wheel nut seat during installation, preventing galling, a common issue that reduces clamping force and damages components over time.

By removing aluminum galling from the equation, Core4 Flug lug nuts maintain consistent torque-to-tension conversion, ensuring optimal stud preload every time they are installed. From the first installation to repeated use, these lug nuts provide reliable clamping force without the need for lubrication on threads or seating surfaces, something traditional lug nuts cannot achieve, regardless of coatings.

The result is long-term tension consistency, which directly improves:

• Wheel retention safety

• Stud longevity

• Fastener reliability under repeated use

Additionally, the Core4 Flug design helps reduce static bending stress on wheel studs caused by misalignment between the wheel hub and tapered lug seats. In real-world applications, slight manufacturing tolerances can create uneven loading on studs. The floating collar compensates for these inconsistencies, minimizing stress concentrations and helping prevent premature stud fatigue or failure.

Core4 Flug lug nuts set a new standard in wheel fastener technology, delivering unmatched consistency, safety, and durability for performance and heavy-duty applications.