S-91286A105 1/4"-20 x 3/4" 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 industrial applications, reducing the risk of fastener failure.
• Zinc-flake coating provides superior corrosion resistance, extending service life in harsh environments and minimizing maintenance needs.
• Grade 8 steel construction with Rockwell C33 hardness offers excellent durability and wear resistance, ideal for heavy-duty mechanical assemblies.
• Fully threaded UNC coarse spacing allows for faster installation and secure gripping in a wide range of materials, improving assembly efficiency.
• External hex drive design enables easy tightening with standard tools, reducing installation time and labor costs.
• Compliance with ASME B18.2.1 and SAE J429 standards guarantees consistent quality and interchangeability, ensuring compatibility in regulated industries.
• RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence, supporting sustainable procurement practices.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in demanding industrial settings, such as machinery assembly, construction, and automotive applications. The high-strength steel material and Rockwell C33 hardness provide robust resistance to vibration and dynamic loads, preventing loosening and structural failures. With its zinc-flake coated finish, it effectively combats corrosion in exposed or humid conditions, reducing downtime and replacement costs. The fully threaded UNC coarse design ensures quick, secure fastening in various substrates, while the external hex drive simplifies maintenance and disassembly. Ideal for heavy-duty bolts and industrial screws, this fastener delivers reliable performance where precision and durability are paramount.

Specification Summary & Compliance

This product features precise Class 2A thread fit and UNC coarse thread spacing, ensuring accurate engagement and ease of use. It adheres to ASME B18.2.1 and SAE J429 manufacturing specifications, guaranteeing dimensional consistency and performance reliability. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and environmentally responsible industrial applications.