S-92620A280 1 1/4"-12 x 6" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load-Bearing Capacity: With a tensile strength of 150,000 psi and Rockwell C33 hardness, this screw reliably withstands extreme mechanical stress in heavy-duty applications.
• Superior Corrosion Resistance: The zinc yellow-chromate plating provides a durable barrier against rust and environmental degradation, extending service life in harsh industrial settings.
• Precise Thread Engagement: UNF fine threading and Class 2A thread fit ensure tight, secure fastening with reduced risk of loosening under vibration or dynamic loads.
• High-Torque Installation Capability: The external hex drive and 1 7/8" head width allow for easy application of high torque using standard tools, speeding up assembly processes.
• Optimized for Critical Applications: Meets ASME B18.2.1 and SAE J429 standards, guaranteeing dimensional accuracy and performance consistency for engineering and machinery assemblies.
• Enhanced Durability in Demanding Environments: Manufactured from high-strength steel with a 6" length and partial threading, it offers robust performance while minimizing material stress concentration.
• Compliant with Global Regulations: RoHS 3 and REACH compliance ensures safe, environmentally responsible use across international industrial supply chains.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, structural frameworks, and high-vibration equipment. The 1 1/4"-12 UNF fine thread and Class 2A thread fit deliver precise alignment and clamping force, reducing the risk of joint failure in dynamic applications. The zinc yellow-chromate plating significantly enhances corrosion resistance, making it ideal for outdoor or chemically exposed environments. With a partially threaded design, it minimizes stress risers and improves fatigue resistance, while the external hex drive ensures reliable installation under high torque. These features collectively provide engineers with a dependable steel fastener that enhances assembly integrity, reduces maintenance downtime, and supports long-term operational safety in industrial settings.

Specification Summary & Compliance

This fastener adheres to Class 2A thread fit tolerances and UNF fine thread standards, ensuring dimensional precision per ASME B18.2.1 and SAE J429. It is manufactured from high-strength steel with a tensile rating of 150,000 psi and Rockwell C33 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting its use in environmentally regulated markets.