S-91247A150 5/16"-24 x 8" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure
• Zinc plating provides superior corrosion resistance, extending service life in demanding industrial environments
• Grade 5 steel construction with Rockwell C25 hardness delivers optimal balance of strength and durability for repeated use
• Partially threaded design with 1-1/8" thread length allows for precise clamping force control and secure joint assembly
• Class 2A thread fit with UNF fine threading ensures smooth installation and vibration resistance in critical applications
• External hex drive design facilitates easy installation and removal with standard tools, improving maintenance efficiency
• Full compliance with industry standards including ASME B18.2.1 and SAE J429 guarantees consistent quality and interchangeability

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers exceptional engineering value through its zinc plated steel construction and UNF fine thread design. The combination of 120,000 psi tensile strength and Rockwell C25 hardness addresses critical industrial challenges by providing reliable fastening in heavy machinery, structural assemblies, and equipment requiring vibration resistance. The partially threaded configuration with precise 1-1/8" thread length prevents over-tightening and ensures proper load distribution, while the external hex drive enables efficient installation in confined spaces. These industrial hex screws are engineered to withstand demanding conditions in manufacturing, construction, and automotive applications where consistent performance and corrosion protection are essential.

Specification Summary & Compliance

This heavy-duty fastener features Class 2A thread fit tolerance with UNF fine thread specifications (5/16"-24) and inch system measurements. Manufactured to ASME B18.2.1 and SAE J429 Grade 5 standards, it ensures dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting current industry requirements for hazardous substance restrictions.