S-90128A810 5/8"-11 x 4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the zinc-plated alloy steel construction extends service life in harsh industrial environments.
• Precise Class 3A thread fit provides consistent engagement and vibration resistance, minimizing loosening in dynamic assemblies.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• 1/2" hex drive design allows for high-torque installation with standard tools, speeding up assembly processes.
• Partially threaded shank enables secure clamping without unnecessary thread engagement, ideal for precision fixturing.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

These 5/8"-11 UNC Socket Head Cap Screws deliver critical performance advantages in demanding industrial applications. The zinc-plated alloy steel construction provides essential corrosion protection for machinery exposed to moisture, chemicals, or outdoor conditions. With their coarse thread spacing and Class 3A thread fit, these fasteners maintain secure connections in high-vibration environments common in heavy equipment, automotive assemblies, and construction machinery. The partially threaded design allows for precise positioning in jigs, fixtures, and structural frameworks where full thread engagement isn't required. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures these screws withstand extreme mechanical loads without stripping or deforming, making them ideal for critical joints in manufacturing equipment, hydraulic systems, and aerospace components where reliability is paramount.

Specification Summary & Compliance

This Socket Head Cap Screw features precise 5/8"-11 UNC coarse threads with Class 3A thread fit for superior engagement accuracy. Manufacturing complies with ASTM A574 specification for high-strength socket head cap screws. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) requirements for chemical safety. Dimensions include 4" length with minimum 1 3/4" thread length, 15/16" head diameter, and standard socket head profile with 1/2" hex drive.