S-91247A564 1/4"-20 x 5 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior load-bearing capability with 120,000 psi tensile strength for reliable performance in high-stress applications
• Enhanced corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Optimized thread engagement with UNC coarse threads and Class 2A fit ensuring vibration-resistant fastening
• Robust material performance from Grade 5 steel with Rockwell C25 hardness for exceptional durability
• Efficient installation and removal via external hex drive design providing maximum torque transfer
• Versatile partial threading allowing for both clamping and alignment functions in assembly operations
• Industry-standard compliance meeting ASME B18.2.1 and SAE J429 specifications for guaranteed interchangeability

Professional Applications & Engineering Value

These Grade 5 hex head screws deliver critical engineering solutions for industrial assembly challenges. The zinc plated steel construction provides essential corrosion protection in manufacturing facilities, construction sites, and mechanical equipment where environmental exposure is a concern. The 1/4"-20 UNC coarse thread configuration ensures rapid installation and superior resistance to vibrational loosening in machinery, structural frameworks, and heavy-duty applications. With partial threading design, these fasteners offer precise clamp load control while allowing for material expansion and contraction. The combination of 120,000 psi tensile strength and Rockwell C25 hardness makes these screws ideal for demanding applications where joint integrity cannot be compromised, from industrial machinery to construction projects requiring reliable, high-strength fastening solutions.

Specification Summary & Compliance

This 1/4"-20 x 5 1/2" hex head screw features precise Class 2A thread fit tolerances and UNC coarse threading per industry standards. Manufactured to meet ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional consistency and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming adherence to international substance restriction requirements for industrial applications.