S-91735A539 1/4"-20 x 5/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated surface treatment
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable, long-term fastening
• Optimal drive engagement with No. 3 Phillips drive, reducing cam-out and enabling efficient installation
• Enhanced holding power from fully threaded UNC coarse pattern, ideal for quick assembly in various materials
• Precise thread fit with Class 2A tolerance ensuring consistent performance and interchangeability
• Broad regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH for safe use in regulated industries
• Versatile pan head design providing a rounded, low-profile finish suitable for numerous industrial applications

Professional Applications & Engineering Value

Engineered for demanding environments, these 316 stainless steel pan head screws deliver outstanding corrosion resistance, making them ideal for marine, chemical processing, and outdoor equipment where moisture and chemicals are prevalent. The fully threaded UNC coarse pattern ensures rapid installation and strong retention in softer materials or when vibration is a concern. With a Phillips drive (No. 3 size) and Class 2A thread fit, they offer reliable, repeatable fastening that reduces assembly time and maintenance. The passivated finish further enhances durability, preventing galling and extending service life in industrial applications.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A dimensional accuracy, ensuring precise fit and performance. It is manufactured in compliance with ASME B18.6.3 standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use.