S-91255A828 0-80 x 3/4" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating that protects against rust and extends service life in demanding environments
• Superior thread engagement with Class 3A fit ensuring precise, vibration-resistant connections in critical assemblies
• High tensile strength of 120,000 PSI provides reliable load-bearing capacity for structural and mechanical applications
• Rockwell C39 hardness delivers excellent wear resistance and maintains thread integrity under repeated use
• Hex drive design allows for secure tool engagement and efficient installation with standard industrial tools
• Fully threaded construction enables maximum grip length and uniform stress distribution along the entire fastener
• Regulatory compliance with ASME, ASTM, RoHS 3, and REACH standards ensures material safety and international acceptance

Professional Applications & Engineering Value

These 0-80 UNF fine thread screws with black-oxide alloy steel construction address critical challenges in precision engineering applications. The Class 3A thread fit provides tighter tolerances than standard fasteners, eliminating play in sensitive instrumentation, aerospace components, and medical devices where vibration resistance is paramount. The rounded button head profile creates a low-profile connection that minimizes protrusion in confined spaces while the hex drive ensures positive torque transmission during assembly. With 120,000 PSI tensile strength and Rockwell C39 hardness, these screws maintain clamping force under dynamic loads and thermal cycling, preventing joint failure in industrial machinery, electronic enclosures, and automotive systems where reliability is non-negotiable.

Specification Summary & Compliance

This precision fastener features 0-80 UNF fine threads with Class 3A fit per ASME standards, ensuring exact dimensional accuracy and interchangeability. Manufacturing complies with ASME B18.3 for dimensional requirements and ASTM F835 for mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for hazardous substances. The inch system measurement provides compatibility with North American industrial standards and equipment.