S-91247A812 5/8"-11 x 4 1/2" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure
• Zinc plating provides excellent corrosion resistance, extending service life in harsh industrial environments
• Grade 5 steel construction with Rockwell C25 hardness offers exceptional durability and resistance to wear
• Coarse UNC threads with Class 2A fit enable faster assembly and better vibration resistance
• External hex drive design allows for high torque application with standard tools
• Partial threading configuration provides optimal grip strength while minimizing material usage
• Compliance with major industry standards including ASME B18.2.1 and SAE J429 ensures quality and interchangeability

Professional Applications & Engineering Value

This 5/8"-11 UNC Grade 5 steel hex head screw delivers exceptional engineering value for industrial applications requiring robust fastening solutions. The zinc plated finish provides critical corrosion protection in environments exposed to moisture and chemicals, while the coarse thread design ensures reliable performance in materials where fine threads might strip or fail. The external hex drive accommodates high torque applications common in construction, machinery assembly, and structural steel work. With partial threading, this fastener offers superior clamping force distribution, making it ideal for applications where vibration resistance and joint integrity are paramount. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures these screws maintain their structural integrity under heavy loads and dynamic stresses.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 5/8"-11 UNC coarse threads and meets ASME B18.2.1 and SAE J429 Grade 5 specifications. The fastener is manufactured to exact dimensional standards with a 4 1/2" length and 1 1/2" minimum thread length. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety standards are maintained.