S-92620A272 1 1/8"-12 x 3 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
• High hardness rating (Rockwell C33) provides excellent wear resistance and durability under repetitive loads.
• Precision UNF fine threading with Class 2A fit offers secure, vibration-resistant connections in critical assemblies.
• External hex drive design allows for easy installation and high torque application with standard tools, improving assembly efficiency.
• Partial threading provides optimal grip length control for specific clamping requirements in structural applications.
• Compliance with major standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interchangeability.

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where fastener reliability is paramount. The zinc yellow-chromate plated steel construction combats corrosion in demanding environments like manufacturing equipment, structural frameworks, and machinery assembly. The 1 1/8"-12 UNF fine thread configuration maintains clamping force under vibration, preventing loosening in dynamic systems. With 150,000 psi tensile strength and Rockwell C33 hardness, it withstands extreme mechanical stresses in construction, automotive, and industrial maintenance applications. The external hex drive facilitates quick installation in confined spaces, while partial threading allows precise engagement in layered materials.

Specification Summary & Compliance

This high-strength hex head screw features precision Class 2A thread fit with 1 1/8"-12 UNF fine threading and meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. Manufactured to Grade 8 standards with 150,000 psi tensile strength and Rockwell C33 hardness, it delivers consistent performance in inch-system applications requiring reliable fastening solutions.