S-91268A715 9/16"-12 x 1 1/4" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: Grade 8 classification and 150,000 psi tensile strength ensure reliable performance under extreme stress, reducing failure risks in critical assemblies.
• Superior Wear Resistance: Rockwell C33 hardness provides excellent durability against abrasion and deformation, extending service life in high-vibration environments.
• Optimized Thread Engagement: Coarse UNC threads with Class 2A fit enable faster installation and superior resistance to loosening in heavy machinery and structural applications.
• Full-Length Threading: Complete thread coverage along the 1-1/4" length allows for flexible positioning and secure fastening across varying material thicknesses.
• Industry-Standard Compliance: Manufactured to ASME B18.2.1 and SAE J429 specifications, ensuring interchangeability and reliability in OEM and MRO applications.
• Enhanced Drive Stability: External hex drive with 13/16" head width offers high torque transmission and prevents stripping during repeated maintenance.
• Environmental Responsibility: RoHS 3 and REACH compliance guarantees safe use in regulated industries without compromising mechanical performance.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these Grade 8 hex head screws address critical challenges in heavy equipment assembly, structural steel connections, and machinery maintenance. The high-strength steel construction combined with coarse UNC threading prevents cross-threading during high-speed installation while maintaining clamp force under dynamic loads. The fully threaded design ensures consistent engagement in stacked components, eliminating the need for multiple fastener lengths. With 150,000 psi tensile strength and Rockwell C33 hardness, these screws resist shear forces in construction applications and vibration-induced fatigue in automotive systems, providing engineers with a reliable solution for permanent and semi-permanent fastening where safety margins are non-negotiable.

Specification Summary & Compliance

This 9/16"-12 UNC hex head screw maintains Class 2A thread fit tolerances per ASME B18.2.1 specifications, ensuring precise interchangeability. Manufacturing complies with SAE J429 Grade 8 requirements for material strength and dimensional consistency. Regulatory adherence includes RoHS 3 (2015/863/EU) restriction compliance and REACH (EC 1907/2006) substance regulation alignment, making these fasteners suitable for global industrial supply chains.