S-91268A440 3/8"-24 x 1" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum load-bearing capability with 150,000 psi tensile strength for critical structural applications
• Superior hardness and durability from Rockwell C33 hardness, resisting wear and deformation under stress
• Precise and secure fastening ensured by Class 2A thread fit and fully threaded 3/8"-24 UNF fine threads
• Easy installation and removal with external hex drive and 9/16" head width for standard wrench compatibility
• Reliable performance in demanding environments thanks to high-strength steel construction
• Compliance with industry standards including ASME B18.2.1 and SAE J429 for consistent quality
• Safe for regulated industries with RoHS 3 and REACH compliance, free from hazardous substances

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value in heavy-duty applications where failure is not an option. The high-strength steel construction, combined with 150,000 psi tensile strength and Rockwell C33 hardness, provides reliable performance in machinery, construction, and automotive assemblies subject to high vibration and dynamic loads. The 3/8"-24 UNF fine threads with Class 2A fit offer superior resistance to loosening, while the external hex drive and fully threaded design enable quick, secure installations. Ideal for industrial fastening where precision, durability, and regulatory compliance are critical.

Specification Summary & Compliance

This screw features a 3/8"-24 UNF thread with Class 2A dimensional accuracy and right-hand thread direction. It meets ASME B18.2.1 and SAE J429 specifications for Grade 8 fasteners, ensuring consistent manufacturing quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.