S-92198A121 1/4"-28 x 4" ASME B18.2.1 18-8 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Precise thread engagement with Class 2A fit and UNF fine threads ensuring reliable, vibration-resistant connections
• Optimized load distribution through partial threading design for improved stress management in critical assemblies
• Industry-standard compliance meeting ASME B18.2.1 specifications for dimensional accuracy and performance
• Environmental regulation adherence with RoHS 3 and REACH compliance for global manufacturing applications
• Efficient installation with external hex drive and standard 7/16" head width for quick tool engagement and torque application

Professional Applications & Engineering Value

This 1/4"-28 UNF hex head screw delivers exceptional engineering value through its 18-8 stainless steel composition and precision fine thread spacing. The combination of 80,000 psi tensile strength and Rockwell B70 hardness addresses critical industrial challenges including vibration-induced loosening and material fatigue in heavy machinery, structural frameworks, and manufacturing equipment. The partially threaded design concentrates thread engagement where needed most, preventing stress concentration while maintaining clamping force integrity. With right-hand thread direction and external hex drive, installation efficiency is maximized in confined spaces and high-volume assembly operations, making it ideal for OEM manufacturing, industrial maintenance, and construction applications requiring reliable, long-lasting fastening solutions.

Specification Summary & Compliance

This 4" length hex head screw features precise Class 2A thread fit tolerance with UNF thread type (1/4"-28) and fine thread spacing manufactured to ASME B18.2.1 dimensional standards. The fastener maintains compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for international industrial markets and regulated applications where material restrictions apply.