S-92186A561 5/8"-18 x 3 1/2" ASME B18.2.1 Super-Corrosion-Resistant 316 Stainless Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 316 stainless steel construction, ideal for harsh chemical and marine environments
• Superior tensile strength rated at 70,000 psi for reliable performance in high-stress applications
• Fine UNF threading provides enhanced vibration resistance and secure fastening in precision assemblies
• Class 2A thread fit ensures consistent installation and compatibility with standard UNF nuts
• Rockwell B70 hardness maintains structural integrity under repeated loading and mechanical stress
• Partial threading design allows for optimized grip length and precise clamping force distribution
• External hex drive enables high-torque installation with standard wrenching tools

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this 316 stainless steel hex head screw delivers critical performance advantages where corrosion resistance and mechanical reliability are paramount. The UNF fine threading creates more thread engagement points per inch compared to coarse threads, significantly improving resistance to vibrational loosening in machinery, processing equipment, and structural assemblies. With its 70,000 psi tensile strength and Rockwell B70 hardness, this fastener maintains clamping force under extreme conditions while the partial threading allows engineers to precisely control engagement depth. The external hex drive accommodates high installation torque requirements, making it suitable for chemical processing plants, marine hardware, food processing equipment, and other applications requiring superior durability against corrosive agents and environmental exposure.

Specification Summary & Compliance

This 5/8"-18 UNF hex head screw features Class 2A thread fit per UNF standards with precise dimensional tolerances. Manufactured to ASME B18.2.1 specifications for hex head bolts and screws, it ensures interchangeability and reliable performance. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting the latest environmental regulations for hazardous substances. With a length of 3 1/2" and minimum thread length of 1 1/2", this partially threaded fastener provides optimal performance for industrial applications requiring certified quality standards.