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Grade 8 Indented Hex Flange Screw (Frame Bolt) Zinc-Yellow CR+6 Bake (Inch)
Our Grade 8 Indented Hex Flange Screws (Frame Bolts) with Zinc‑Yellow CR+6 Bake finish are high‑strength fasteners engineered for heavy‑duty structural and automotive applications. Manufactured from alloy steel and heat‑treated to Grade 8 specifications, these bolts deliver exceptional tensile strength, clamp load, and durability in demanding service conditions.
The indented hex flange design provides an integrated bearing surface that distributes load evenly and helps resist loosening under vibration, eliminating the need for a separate washer. Commonly referred to as frame bolts, these fasteners are widely used in automotive frames, suspension systems, heavy equipment, and structural assemblies. The Zinc‑Yellow CR+6 plating with post‑bake treatment offers enhanced corrosion resistance while reducing the risk of hydrogen embrittlement, making these bolts suitable for high‑strength, safety‑critical applications.
Designed for performance and reliability, Grade 8 Zinc‑Yellow CR+6 Indented Hex Flange Screws are ideal for applications requiring high torque, vibration resistance, and long‑term structural integrity. The yellow zinc finish provides visible corrosion protection and extended service life in indoor and light‑to‑moderate outdoor environments. Available in a range of diameters and lengths, these frame bolts deliver consistent quality and strength for OEM manufacturing, automotive repair, heavy equipment assembly, and industrial construction.
