S-90002A133 5/8"-11 x 3" ASME B18.2.1, SAE J429 High-Strength Steel Hex Head Screws with Material Certification

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 PSI ensures reliable performance in the most demanding heavy-duty applications
• Superior corrosion resistance provided by zinc yellow-chromate plating extends service life in harsh industrial environments
• High hardness rating of Rockwell C33 maintains structural integrity under extreme mechanical stress and vibration
• Optimized thread design with coarse UNC threading enables faster installation and superior holding power
• Precision external hex drive allows for high-torque installation with standard tools while preventing stripping
• Grade 8 certification guarantees consistent quality and performance meeting rigorous industrial standards
• Partial threading configuration provides both secure fastening and precise alignment capabilities

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness ensures these steel fasteners withstand extreme mechanical stress, vibration, and shock loads common in construction, machinery assembly, and structural applications. The zinc yellow-chromate plating provides superior corrosion protection, making them ideal for outdoor equipment, industrial machinery, and automotive applications exposed to harsh environments. The coarse UNC thread design ensures rapid installation and superior resistance to loosening, while the external hex drive accommodates high-torque applications without compromising drive integrity.

Specification Summary & Compliance

These 5/8"-11 hex head screws feature Class 2A thread fit for optimal assembly performance and partial threading with minimum 1½" thread length. Manufactured to exacting ASME B18.2.1 and SAE J429 specifications, these Grade 8 fasteners maintain dimensional accuracy and mechanical properties required for critical applications. The 3" length with 15/16" head width and 25/64" head height provides optimal clamping capability. Compliant with industry standards for heavy-duty industrial fasteners, ensuring reliable performance in demanding environments.