S-91268A991 1"-8 x 7" 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 demanding applications, reducing the risk of fastener failure under high stress.
• Grade 8 steel construction with Rockwell C33 hardness provides superior durability and resistance to wear, extending service life in harsh industrial environments.
• Class 2A thread fit offers consistent assembly and easy installation, minimizing cross-threading issues and improving operational efficiency.
• Partial threading design allows for precise clamping force control, ideal for applications requiring specific grip lengths and vibration resistance.
• Coarse UNC threads enable quick engagement and disassembly, saving time in maintenance and repair tasks without compromising holding power.
• External hex drive facilitates straightforward tightening with standard tools, enhancing usability across various industrial settings.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interoperability, supporting reliable integration into engineered systems.

Professional Applications & Engineering Value

Engineered for heavy-duty applications, this Grade 8 hex head screw addresses critical challenges in construction, machinery, and automotive sectors where high tensile strength and durability are paramount. The steel material and Rockwell C33 hardness provide resistance to deformation and fatigue, solving issues like joint loosening under dynamic loads. With a 1"-8 UNC coarse thread and partial threading, it ensures secure fastening in thick materials while allowing flexibility in grip range. The external hex drive simplifies installation in confined spaces, reducing assembly time and labor costs. Ideal for structural frames, industrial equipment, and high-stress connections, this screw delivers long-term reliability and performance consistency in demanding environments.

Specification Summary & Compliance

This product features precise Class 2A thread fit per UNC standards, with a thread size of 1"-8 and minimum thread length of 2 1/2". It meets ASME B18.2.1 and SAE J429 specifications for dimensional accuracy and performance. Additionally, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.