S-91283A154 1 1/8"-7 x 7 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 100,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Grade 5 steel construction with Rockwell C19 hardness provides superior durability and resistance to wear, extending service life in industrial environments.
• Coarse UNC threads with Class 2A fit offer faster assembly and better vibration resistance, minimizing loosening in high-stress conditions.
• Partially threaded design with 2 3/4" minimum thread length allows for precise clamping force control and secure fastening in variable material thicknesses.
• External hex drive and hex head enable easy installation and removal with standard tools, improving maintenance efficiency.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability for engineering projects.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

This Grade 5 hex head screw is engineered to address critical challenges in heavy machinery, construction, and structural assemblies where high tensile strength and vibration resistance are paramount. The 1 1/8"-7 UNC coarse thread design, combined with a partially threaded shank, provides optimal grip and load distribution, reducing stress concentration in bolted joints. Made from hardened steel with Rockwell C19 hardness, it withstands harsh conditions, including dynamic loads and corrosion-prone environments, while the external hex drive ensures quick, tool-friendly installation. Ideal for industrial fastening, this screw meets ASME B18.2.1 specifications, offering reliability in applications such as equipment frames, automotive components, and infrastructure projects, where precision and compliance are non-negotiable.

Specification Summary & Compliance

This screw features precise UNC coarse threads with Class 2A thread fit, ensuring dimensional accuracy and smooth engagement. It adheres to ASME B18.2.1 and SAE J429 manufacturing standards, with a 7 1/2" length and 2 3/4" minimum thread length. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for environmentally conscious industrial use.