S-91268A268 3/8"-16 x 1" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications - Grade 8 classification and 150,000 PSI tensile strength prevent failure under extreme loads
• Superior durability and wear resistance - Rockwell C33 hardness maintains structural integrity in high-stress environments
• Reliable fastening performance - Fully threaded UNC coarse thread design ensures maximum grip and vibration resistance
• Precise engineering fit - Class 2A thread fit provides consistent, accurate installation with standard nuts
• Easy installation and removal - External hex drive with 9/16" head width offers excellent tool engagement and torque transfer
• Industry-standard compliance - Meets ASME B18.2.1 and SAE J429 specifications for guaranteed quality and interchangeability
• Environmentally responsible manufacturing - RoHS 3 and REACH compliant for safe use in regulated industries

Professional Applications & Engineering Value

These Grade 8 hex head screws deliver critical performance in industrial settings where failure is not an option. The steel construction with Rockwell C33 hardness provides exceptional resistance to shear forces and environmental degradation, making them ideal for heavy machinery, structural assemblies, and high-vibration equipment. The 3/8"-16 UNC coarse threading ensures rapid installation while maintaining superior holding power, particularly in softer materials where fine threads might strip. With fully threaded design and Class 2A thread fit, these fasteners distribute stress evenly along the entire length, preventing concentration points that lead to fatigue failure. The external hex drive accommodates standard wrenches for secure tightening in confined spaces, while the 1" length provides versatile application across various material thicknesses in construction, automotive, and manufacturing sectors.

Specification Summary & Compliance

This heavy-duty hex head screw features precise Class 2A thread fit per UNC standards with 3/8"-16 coarse threading and right-hand thread direction. Manufactured to ASME B18.2.1 specifications and SAE J429 Grade 8 requirements, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions. The fastener delivers 150,000 PSI tensile strength with Rockwell C33 hardness verification, providing reliable performance in critical industrial applications.