S-92620A572 1/4"-28 x 1 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: With a tensile strength of 150,000 psi, these screws withstand extreme mechanical stresses, reducing the risk of failure in heavy-duty applications.
• Superior Corrosion Protection: Zinc yellow-chromate plating offers excellent resistance to rust and environmental degradation, extending service life in harsh conditions.
• Precise and Secure Fastening: UNF fine threads provide tighter engagement and improved vibration resistance, ensuring reliable connections in critical assemblies.
• High Durability and Wear Resistance: Grade 8 classification and Rockwell C33 hardness guarantee long-term performance under repetitive loads and high-stress environments.
• Efficient Installation and Removal: External hex drive and hex head design allow for easy tool access and high torque application, speeding up assembly and maintenance.
• Full Thread Engagement: Fully threaded design maximizes grip and distribution of clamping force along the entire length, enhancing joint integrity.
• Industry-Standard Compliance: Manufactured to ASME B18.2.1 and SAE J429 specifications, ensuring consistent quality and interchangeability in professional applications.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this Grade 8 hex head screw addresses critical challenges in machinery, construction, and automotive sectors. The steel material combined with zinc yellow-chromate plating provides a robust defense against corrosion, making it ideal for outdoor or high-moisture settings. Its UNF fine thread and Class 2A thread fit deliver precise alignment and superior resistance to loosening under vibration, a common issue in dynamic systems. With a 1/4"-28 thread size and 1-1/4" length, it offers versatile fastening solutions for structural components, engine parts, and heavy equipment, ensuring reliability where failure is not an option. The external hex drive facilitates quick installation, reducing downtime and labor costs in maintenance and assembly lines.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances for consistent engagement and meets ASME B18.2.1 and SAE J429 standards, ensuring dimensional accuracy and performance reliability. The inch system measurements, including thread diameter of 0.25" and fine thread spacing, are precision-manufactured for compatibility with industry equipment. Compliance with RoHS and REACH regulations is confirmed, supporting safe and environmentally responsible use in global markets.