S-92800A411 1/2"-20 x 4" 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
• High tensile strength of 80,000 psi ensures reliable performance under heavy loads and vibration
• Precision Class 2A thread fit provides consistent engagement and reduces cross-threading risks
• Fine UNF threading offers better adjustment control and superior vibration resistance compared to coarse threads
• External hex drive design allows for high-torque installation with standard tools
• Full threading along 4" length enables flexible positioning and secure fastening in deep applications
• Rockwell B70 hardness rating maintains thread integrity and prevents stripping during repeated use

Professional Applications & Engineering Value

These 1/2"-20 UNF hex head screws deliver exceptional value in demanding applications where corrosion resistance and mechanical strength are critical. The 18-8 stainless steel composition provides inherent protection against rust and chemical degradation, making these fasteners ideal for marine equipment, food processing machinery, and outdoor structural assemblies. The fine UNF thread profile creates more thread contact points per inch compared to coarse threads, significantly improving vibration resistance in dynamic load environments. With Class 2A thread fit precision, these screws ensure consistent clamping force distribution while minimizing the risk of galling during installation. The external hex drive accommodates high torque requirements without cam-out issues, while the fully threaded design offers installation flexibility across varying material thicknesses.

Specification Summary & Compliance

This 4" hex head screw features 1/2"-20 UNF fine threading with Class 2A thread fit tolerance per UNF standards, ensuring precise dimensional accuracy and interchangeability. The fastener maintains Rockwell B70 hardness and 80,000 psi tensile strength for demanding mechanical applications. Manufacturing and material compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and restricted substance adherence for global industrial use.