S-94688A334 5/8"-11 x 3" ASME B18.2.1 Square Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: SAE Grade 8 rating and 150,000 psi tensile strength ensure reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance: Zinc yellow-chromate plating provides a durable barrier against rust and environmental degradation, extending service life in harsh conditions.
• Optimized for High-Torque Applications: External square drive and square head design allow for secure tool engagement and efficient installation with standard wrenches.
• Reliable Thread Engagement: Unified Standard Class 3A thread fit and coarse 5/8"-11 UNC threading offer excellent vibration resistance and quick assembly.
• Full Thread Coverage: Fully threaded 3" length provides maximum grip and adjustability across the entire shank for versatile mounting needs.
• Industry Standard Compliance: Manufactured to ASME B18.2.1 specifications, ensuring consistent quality and interchangeability in professional settings.
• Robust Material Construction: Made from high-grade steel, this fastener delivers outstanding hardness and durability for long-term structural integrity.

Professional Applications & Engineering Value

This 5/8"-11 UNC square head screw is engineered to address critical challenges in heavy-duty industrial and construction applications. The SAE Grade 8 steel construction and 150,000 psi tensile strength provide the necessary robustness for structural connections, machinery assembly, and equipment framing where dynamic loads and vibrations are common. The coarse UNC threading and Class 3A thread fit ensure rapid installation and superior resistance to loosening under stress, while the zinc yellow-chromate plating significantly enhances corrosion resistance in outdoor or high-moisture environments. Its external square drive and fully threaded design facilitate secure, high-torque fastening, making it an ideal choice for demanding sectors such as industrial machinery, infrastructure projects, and heavy equipment manufacturing.

Specification Summary & Compliance

This square head screw adheres to precise dimensional standards with a Unified Standard Class 3A thread fit and 5/8"-11 UNC coarse threading, ensuring excellent interchangeability and performance. It is manufactured in compliance with ASME B18.2.1 specifications, guaranteeing consistent quality and reliability. The fastener meets industry requirements for high-strength applications, with a tensile strength of 150,000 psi and a right-hand thread direction. Material and finish selections align with common industrial standards for durability and corrosion protection.