S-91249A539 1/4"-20 x 5/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coated 18-8 stainless steel, ideal for harsh industrial environments
• High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under heavy loads
• Rockwell B70 hardness provides excellent durability and resistance to wear and deformation
• Full UNC coarse threading with Class 2A fit offers quick installation and secure grip in various materials
• Phillips pan head design allows for easy driving and a low-profile, rounded finish
• Compliance with ASME B18.6.3 standards guarantees precise dimensions and consistent performance
• RoHS 3 and REACH compliant for safe, environmentally responsible use in regulated industries

Professional Applications & Engineering Value

This black-oxide 18-8 stainless steel screw is engineered to address common industrial challenges, such as corrosion in humid or chemical-exposed settings. The black-oxide coating enhances surface protection, reducing maintenance needs and extending service life in applications like machinery assembly, electrical enclosures, and outdoor equipment. With a 1/4"-20 UNC coarse thread and Class 2A fit, it ensures rapid, secure fastening in metals and plastics, minimizing the risk of stripping. The Phillips pan head design facilitates efficient installation with standard tools, making it a versatile choice for industrial screws requiring high strength and reliability. Its full threading distributes stress evenly, preventing joint failure in dynamic loads.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A dimensional accuracy for consistent fit and performance. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring adherence to industry standards for head style, drive, and threading. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environments with strict environmental and safety requirements.