S-98164A214 1/4"-20 x 1" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments due to 316 stainless steel construction with passivated finish
• High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Precise thread engagement ensured by Class 3A thread fit and UNC coarse threading for reliable fastening
• Easy installation and removal with 5/32" hex drive design and rounded button head profile
• Full threading coverage along the 1" length provides maximum grip and load distribution
• Regulatory compliance with ASME B18.3, ASTM F879, RoHS 3, and REACH standards for quality assurance
• Durable surface protection through passivation treatment enhancing longevity in corrosive conditions

Professional Applications & Engineering Value

These 316 stainless steel rounded head screws with UNC coarse threads and Class 3A thread fit deliver exceptional reliability in corrosive or high-moisture settings like marine equipment, chemical processing, and outdoor infrastructure. The passivated finish significantly boosts corrosion resistance, while the hex drive and button head design allow for secure torque application in confined spaces. Engineered to meet ASME B18.3 specifications, these fully threaded screws ensure uniform stress distribution, reducing the risk of loosening under vibration—making them ideal for industrial fastening where durability and compliance are critical.

Specification Summary & Compliance

This product adheres to Class 3A thread fit tolerances per UNC standards, with dimensions including 1/4"-20 thread size, 1" length, and 5/32" hex drive. Manufacturing complies with ASME B18.3 and ASTM F879 specifications, and the screws are verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental and safety standards are met for global industrial use.