S-92965A581 5/16"-18 x 3/4" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 PSI ensures reliable performance in demanding applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black oxide finish prolongs service life in harsh industrial environments.
• High hardness rating (Rockwell C25) provides excellent wear resistance and durability under heavy loads.
• Coarse UNC thread design enables faster installation and better performance in materials prone to stripping.
• Class 2A thread fit offers optimal balance between easy assembly and secure fastening for consistent results.
• Full threading along the entire 3/4" length maximizes grip strength and load distribution.
• External hex drive allows for high torque application with standard tools, speeding up assembly processes.

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering value through its high-strength steel construction and black oxide surface treatment, specifically designed to address common industrial fastening challenges. The combination of 120,000 PSI tensile strength and Rockwell C25 hardness ensures reliable performance in heavy machinery, structural assemblies, and equipment manufacturing where vibration resistance and load-bearing capacity are paramount. The coarse UNC thread pattern provides superior holding power in softer materials and accelerates installation in production environments. Fully threaded along its entire 3/4" length, this fastener maximizes engagement surface area, distributing stress evenly to prevent point failures. The external hex drive design accommodates high-torque applications while the black oxide finish significantly enhances corrosion resistance, making it ideal for automotive, construction, and industrial equipment applications requiring durable, long-lasting fastening solutions.

Specification Summary & Compliance

This 5/16"-18 hex head screw features Class 2A thread fit tolerances per UNC standards, ensuring proper clearance for reliable assembly. Manufacturing complies with ASME B18.2.1 specifications and SAE J429 standards for Grade 5 fasteners. The product is RoHS 3 (2015/863/EU) Compliant, meeting environmental regulations for hazardous substance restrictions. Thread spacing is coarse with right-hand direction, and the fastener is fully threaded along its 3/4" length with external hex drive configuration.