S-92186A329 1/4"-28 x 3" ASME B18.2.1 Super-Corrosion-Resistant 316 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction for long-lasting performance in harsh environments
• Precise thread engagement with Class 2A fit UNF fine threading ensuring reliable, vibration-resistant connections
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Easy installation and removal with external hex drive and standard 7/16" head width for common tool compatibility
• Optimized load distribution with partial threading design that concentrates threads where needed most
• Regulatory compliance assurance meeting ASME B18.2.1 standards and environmental regulations including RoHS 3 and REACH
• Versatile 3" length providing ample engagement for various material thicknesses in industrial assemblies

Professional Applications & Engineering Value

This 316 stainless steel hex head screw delivers exceptional engineering value in corrosive and high-stress environments where fastener failure is not an option. The UNF fine threading with Class 2A thread fit provides superior vibration resistance compared to coarse threads, making it ideal for machinery, marine equipment, and chemical processing applications where constant motion or thermal cycling occurs. The external hex drive design ensures maximum torque application without stripping, while the partially threaded configuration concentrates the 3/4" minimum thread length precisely where clamping force is required. With 70,000 psi tensile strength and Rockwell B70 hardness, this fastener maintains integrity under substantial mechanical loads, solving critical challenges in structural assemblies, heavy equipment manufacturing, and infrastructure projects where corrosion resistance and reliability are paramount.

Specification Summary & Compliance

This 1/4"-28 UNF hex head screw features precise Class 2A thread fit per ASME B18.2.1 specifications, ensuring dimensional accuracy and interchangeability. The manufacturing complies with ASME B18.2.1 standards for hex head cap screws, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Thread specifications include right-hand direction, fine thread spacing, and 0.25" thread diameter, providing reliable performance in industrial fastening applications requiring standardized components.