S-92190A127 3/8"-16 x 3" ASME B18.2.1, SAE J429 Left-Hand Threaded Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 110,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance and durability through Grade 5 steel construction with Rockwell C21 hardness
• Secure anti-loosening performance achieved through left-hand thread design for specialized machinery applications
• Quick installation and removal facilitated by external hex drive and 9/16" head width for standard wrench compatibility
• Precise thread engagement ensured by Class 2A thread fit and UNC coarse thread spacing
• Full-length fastening capability provided by complete threading along the 3" length
• Regulatory compliance assurance meeting ASME B18.2.1, SAE J429 standards and environmental regulations

Professional Applications & Engineering Value

This Grade 5 steel hex head screw delivers critical engineering solutions for industrial applications where reverse rotation prevention is essential. The left-hand UNC thread configuration provides secure fastening in rotating equipment where conventional right-hand threads would naturally loosen. Manufactured from high-strength steel with Rockwell C21 hardness, this fastener withstands significant vibrational stresses and heavy loads while maintaining structural integrity. The coarse thread spacing ensures reliable performance in softer materials and applications requiring frequent disassembly. With its external hex drive and substantial head dimensions, installation torque is effectively distributed, reducing the risk of stripping during high-torque applications. This combination of material strength, specialized threading, and precise manufacturing makes it ideal for machinery, automotive, and heavy equipment applications demanding reliable, long-term fastening solutions.

Specification Summary & Compliance

This heavy-duty fastener features precise Class 2A thread fit with UNC coarse thread specifications, ensuring proper engagement and reliable performance. The 3/8"-16 thread size with full threading along the 3" length provides consistent fastening capability. Manufacturing complies with ASME B18.2.1 and SAE J429 standards, guaranteeing dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across various industrial sectors. The inch system measurement and specified head dimensions (9/16" width, 1/4" height) maintain compatibility with standard tooling and industry specifications.