S-95635A539 1/4"-20 x 5/8" ASME B18.3 Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized hex drive design to prevent unauthorized access in secure installations
• Superior corrosion resistance through 18-8 stainless steel construction and passivated surface treatment
• Maximum thread engagement with Class 3A precision fit ensuring reliable fastening in demanding applications
• Exceptional mechanical strength delivering 70,000 psi tensile strength for heavy-duty load requirements
• Optimized head profile with rounded button design providing smooth finish and reduced snagging
• Industry-standard compliance meeting ASME B18.3 specifications for consistent performance and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing practices

Professional Applications & Engineering Value

This 18-8 stainless steel tamper-resistant rounded head screw addresses critical security and durability challenges in industrial environments. The passivated finish significantly enhances corrosion resistance, making it ideal for harsh conditions where moisture or chemicals are present. The tamper-resistant hex drive provides essential security for public facilities, machinery access panels, and electronic enclosures where vandalism or unauthorized access is a concern. With its Class 3A thread fit and UNC coarse threading, installation is streamlined while maintaining superior holding power. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in vibration-prone applications, from manufacturing equipment to infrastructure projects where fastener failure is not an option.

Specification Summary & Compliance

This fastener features precision 1/4"-20 UNC coarse threads with Class 3A thread fit for optimal engagement and reliability. Manufacturing adheres to ASME B18.3 standards ensuring dimensional consistency and performance predictability. The screw maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial applications requiring strict material restrictions.