S-90299A720 3/8"-16 x 1 1/4" ASME B18.3, ASTM A574 Brass-Tip Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Precision Thread Fit: Class 3A UNC threads ensure tight, reliable fastening with minimal risk of loosening in high-vibration environments.
• Exceptional Strength & Durability: With a tensile strength of 180,000 psi and Rockwell C39 hardness, this screw withstands heavy loads and resists wear over time.
• Nonmarring Brass Tip: Protects sensitive surfaces from scratches and damage during installation, ideal for finished products or delicate assemblies.
• Superior Corrosion Resistance: Black-oxide coating on alloy steel provides enhanced protection against rust and environmental degradation.
• Easy Installation & Removal: Hex drive (5/16") and socket head design allow for secure tool engagement in confined spaces.
• Full Thread Engagement: Fully threaded rod ensures maximum grip and load distribution along the entire length.
• Regulatory Compliance: Meets ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical industrial challenges where precision, strength, and surface protection are paramount. The 3/8"-16 UNC coarse thread with Class 3A fit delivers reliable performance in high-stress applications, such as machinery assembly, automotive components, and precision equipment. The nonmarring brass tip prevents damage to soft or finished surfaces, making it ideal for use in electronics, aerospace, and consumer goods manufacturing. Combined with a Rockwell C39 hardness and 180,000 psi tensile strength, it offers long-term durability under dynamic loads. The hex drive design facilitates easy installation in tight spaces, reducing assembly time while maintaining torque integrity. Fully compliant with ASME B18.3 and environmental regulations, this screw provides a dependable fastening solution for demanding engineering projects.

Specification Summary & Compliance

This socket head cap screw features a 3/8"-16 UNC coarse thread with Class 3A precision fit, ensuring dimensional accuracy and reliable performance. Manufactured from alloy steel with a black-oxide finish, it meets ASME B18.3 specifications for socket head cap screws. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards. Additional attributes include a fully threaded design, right-hand thread direction, and a nonmarring brass tip for surface protection.