S-91257A885 3/4"-16 x 7" 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 in high-stress applications, reducing the risk of fastener failure.
• Superior Corrosion Resistance: Zinc yellow-chromate plating provides excellent protection against rust and environmental degradation, extending service life in harsh conditions.
• Precision Thread Fit: Class 2A thread fit and UNF fine thread design offer consistent, secure fastening with reduced vibration loosening.
• Optimized for High-Torque Applications: External hex drive with 1 1/8" head width allows for high torque application using standard tools, ensuring tight, secure installations.
• Enhanced Durability: Rockwell C33 hardness provides exceptional wear resistance, maintaining structural integrity under repeated stress.
• Versatile Threading Design: Partial threading allows for both secure clamping and adjustable positioning in assembly applications.
• Regulatory Compliance Assurance: Meets ASME B18.2.1, SAE J429, RoHS 3, and REACH standards, ensuring quality and environmental responsibility for industrial use.

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers critical engineering solutions where high tensile strength and corrosion resistance are paramount. The steel construction with Rockwell C33 hardness withstands extreme mechanical stress in heavy machinery, construction equipment, and automotive assemblies. The zinc yellow-chromate plating effectively combats corrosive environments, making it ideal for outdoor or marine applications. With its 3/4"-16 UNF fine thread and Class 2A thread fit, it ensures precise, vibration-resistant connections in critical joints. The external hex drive and 7" length facilitate easy installation in deep or hard-to-reach areas, while partial threading provides optimal clamp load distribution. These industrial hex screws are engineered to prevent structural failures, reduce maintenance cycles, and enhance operational safety in demanding B2B environments.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit per UNF standards with precise 3/4"-16 fine threading and 2" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 specifications, it guarantees dimensional accuracy and mechanical performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for global industrial supply chains.