S-91257A994 1"-14 x 8" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 PSI tensile strength and Grade 8 classification for demanding industrial applications
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh environments
• Precise thread engagement with 1"-14 extra fine thread spacing and Class 2A fit for vibration-resistant connections
• Optimized strength-to-weight ratio through Rockwell C33 hardness and partial threading design
• Easy installation and removal with external hex drive and 1 1/2" head width for standard wrench compatibility
• Reliable performance assurance through compliance with ASME B18.2.1 and SAE J429 manufacturing standards
• Environmental compliance meeting RoHS 3 and REACH regulations for global industrial use

Professional Applications & Engineering Value

This Grade 8 hex head screw delivers exceptional engineering value in heavy machinery, structural steel connections, and industrial equipment assembly where vibration resistance and sustained clamping force are critical. The 1"-14 extra fine thread configuration provides maximum thread engagement in thin materials and superior resistance to loosening under dynamic loads. The zinc yellow-chromate plated steel construction offers enhanced corrosion protection in industrial environments, while the partial threading design concentrates strength where needed most. These industrial screws solve common engineering challenges including joint integrity maintenance, material compatibility issues, and long-term reliability concerns in demanding applications from construction to manufacturing.

Specification Summary & Compliance

Manufactured to exacting Class 2A thread fit tolerances with UNS thread standards, this fastener ensures precise dimensional accuracy and reliable performance. The product fully complies with ASME B18.2.1 and SAE J429 specifications for hex head screws, guaranteeing consistent quality and interchangeability. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) adherence, making these screws suitable for regulated industries and international projects requiring certified components.