S-90283A083 2-56 x 5/8" ASME B18.6.3 Steel Pan Head Slotted Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
• Superior thread engagement with Class 2A UNC coarse threads ensuring reliable fastening and vibration resistance
• Optimized drive compatibility through standard slotted design for straightforward installation with common tools
• Increased mechanical strength from Rockwell B60 hardness providing excellent load-bearing capacity
• Full-threaded design delivering maximum grip length and uniform stress distribution along the entire fastener
• Standard-compliant performance meeting ASME B18.6.3 specifications for dimensional accuracy and quality assurance
• Environmental compliance with RoHS 3 and REACH regulations for safe use across global markets

Professional Applications & Engineering Value

These zinc-plated steel rounded head screws with 2-56 UNC coarse threading deliver exceptional value in industrial assembly applications where corrosion resistance and reliable fastening are paramount. The pan head design with slotted drive provides excellent surface contact while maintaining low profile clearance requirements. Engineered with Rockwell B60 hardness and Class 2A thread fit, these fasteners withstand vibrational stresses in machinery, electronic enclosures, and automotive components. The fully threaded configuration ensures maximum engagement in both thin and thick materials, while the zinc plating creates a protective barrier against oxidation in humid or outdoor environments. These characteristics make them ideal for maintenance operations, production lines, and OEM equipment requiring consistent, repeatable fastening performance.

Specification Summary & Compliance

This rounded head screw features precise Class 2A thread fit with UNC coarse threading (2-56 size) and standardized dimensions per ASME B18.6.3 manufacturing specifications. The fastener maintains dimensional accuracy with 0.167" head diameter, 0.053" head height, and 5/8" length. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and global market acceptance for industrial applications.