S-91253A977 7/8"-9 x 1 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – With 130,000 psi tensile strength, these screws provide reliable, long-lasting fastening in demanding industrial environments.
• Superior Corrosion Resistance – The black-oxide finish on alloy steel enhances durability and protects against rust and wear in harsh conditions.
• High-Precision Thread Fit – Class 3A thread fit ensures tight, secure connections, reducing the risk of loosening under vibration or load.
• Easy Installation & Removal – The 9/16" hex drive allows for quick, tool-friendly installation and maintenance, saving time on assembly lines.
• Optimized for Heavy-Duty Use – Coarse UNC threads and full threading provide excellent grip and holding power in wood, metal, and composite materials.
• Consistent Hardness & Reliability – Rockwell C37 hardness ensures the screw maintains its shape and performance under high-stress applications.
• Broad Industrial Compliance – Meets ASTM F835, RoHS 3, and REACH standards, ensuring safety and environmental responsibility in global supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these 7/8"-9 UNC flat head screws address critical challenges in machinery assembly, structural frameworks, and equipment manufacturing. The black-oxide alloy steel construction offers enhanced corrosion resistance, which is vital in environments exposed to moisture, chemicals, or outdoor elements. The coarse thread design and Class 3A thread fit ensure rapid installation and superior vibration resistance, minimizing maintenance downtime. With a fully threaded profile and 82° countersink angle, these screws provide flush mounting and even load distribution, making them ideal for use in automotive, construction, and heavy machinery where reliability and ASTM F835 compliance are non-negotiable.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 3A thread fit and UNC coarse thread specifications, ensuring consistent performance and interchangeability. Manufacturing and material quality comply with ASTM F835, while environmental regulations such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) are fully met, confirming the screw's suitability for global industrial markets without hazardous substances.