S-91251A054 0-80 x 3/16" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precise Class 3A thread fit provides excellent engagement and vibration resistance, minimizing loosening in dynamic environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial conditions.
• Rockwell C37 hardness delivers exceptional durability and wear resistance, maintaining thread integrity over repeated use.
• Hex socket drive design allows for secure tool engagement and high torque application, facilitating easy installation in confined spaces.
• Fully threaded 0-80 UNF fine thread ensures maximum grip and load distribution, ideal for precision assemblies requiring fine adjustment.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety, meeting rigorous industry standards.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in precision machinery, electronics, and automotive systems where space constraints and high vibration are common. The 0-80 UNF fine thread and Class 3A fit provide superior clamping force and resistance to loosening, essential for maintaining alignment in sensitive equipment. The hex drive design enables efficient installation with standard tools, reducing assembly time while the corrosion-resistant coating ensures long-term reliability in humid or chemically exposed environments. Ideal for applications demanding high strength-to-weight ratios, such as aerospace components and medical devices, this screw delivers consistent performance under extreme mechanical stress, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This socket head cap screw features a 0-80 UNF fine thread with Class 3A thread fit for precise dimensional accuracy, ensuring tight tolerances per unified screw thread standards. Manufactured in compliance with ASTM A574 specifications for alloy steel socket head cap screws, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted hazardous substances. The product is fully threaded, right-hand direction, and adheres to industry-recognized metrics for hardness (Rockwell C37) and tensile strength (170,000 psi), providing assurance of quality and reliability in professional use.