GRADE 8 ALLOY STEEL CONSTRUCTION – Quenched and tempered alloy steel delivers 150,000 PSI minimum tensile strength for heavy-duty applications where standard fasteners fail, meeting SAE J429 Grade 8 specifications for critical load-bearing joints. 5/8-11 USS COARSE THREAD – Standard coarse thread provides reliable engagement and faster assembly in heavy machinery, automotive, agricultural equipment, and structural applications requiring secure fastening under high stress. YELLOW CHROMATE ZINC COATING – Corrosion-resistant finish protects against moisture and environmental exposure, extending service life in outdoor, industrial, and equipment repair environments where rust compromises joint integrity. ACCURATE DIMENSIONAL SPECIFICATIONS – Machined to precise 5/8-11 threading standards for correct fit with standard nuts and hardware, addressing the sizing consistency professionals expect for jobsite and shop applications. 10-PIECE PACK FOR MAINTENANCE AND REPAIR – Quantity supports equipment repair, fabrication projects, fleet maintenance, and MRO operations requiring high-strength hex head cap screws for demanding fastening tasks. Grade 8 alloy steel 5/8-11 hex head cap screws engineered for heavy machinery, automotive repair, agricultural equipment, and industrial fastening applications where maximum tensile strength and reliable thread engagement are required.

Specifications
Material: Alloy steel, quenched and tempered
Grade: SAE J429 Grade 8
Tensile strength: 150,000 PSI minimum
Hardness: Rockwell C33-39
Thread: 5/8-11 USS coarse thread
Finish: Yellow chromate zinc
Quantity: 10 pieces

Performance & Application Explanation
These hex head cap screws are manufactured from quenched and tempered alloy steel to Grade 8 specifications, delivering the highest strength rating available in standard SAE fasteners. The 5/8-11 USS coarse thread form provides strong engagement with matching nuts and tapped holes, supporting secure assembly in high-vibration and high-load environments. Yellow chromate zinc coating offers corrosion protection while maintaining visibility for inspection and torque verification. Mechanical properties of 150,000 PSI tensile strength and Rockwell C33-39 hardness support dependable performance in critical joints.

B2B Use Cases
Applicable for heavy equipment repair, automotive and truck maintenance, agricultural machinery, construction equipment, fabrication shops, frame assemblies, suspension components, and industrial fastening tasks requiring Grade 8 strength ratings.

Quality & Trust Reassurance
Thread sizing and material hardness align with SAE J429 Grade 8 standards for accuracy and durability. Designed for mechanics, maintenance crews, and fabricators seeking reliable high-strength fasteners for demanding applications where joint failure is not acceptable.