S-91247A016 1/4"-28 x 2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• High tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Zinc plating provides excellent corrosion resistance, extending service life in harsh industrial environments.
• Partially threaded design with a 3/4" minimum thread length offers optimal grip and clamping force where needed.
• Grade 5 steel construction with Rockwell C25 hardness delivers superior durability and resistance to wear.
• UNF fine threads with Class 2A fit ensure precise, secure fastening and vibration resistance.
• External hex drive and hex head allow for easy installation and removal with standard tools.
• Compliance with ASME, SAE, RoHS 3, and REACH standards guarantees quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This Grade 5 steel hex head screw is engineered to address critical fastening challenges in heavy-duty industrial settings. Its 1/4"-28 UNF fine thread and partially threaded design provide enhanced grip and reduced risk of loosening under vibration, making it ideal for machinery, automotive assemblies, and structural applications. The zinc plating offers robust protection against corrosion, ensuring longevity in exposed or humid conditions. With a tensile strength of 120,000 psi and Rockwell C25 hardness, it withstands high stress and repetitive loads, delivering reliable performance that minimizes maintenance downtime and boosts operational efficiency.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and adheres to ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and mechanical properties. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for use in various industrial and international markets.