S-91253A474 10-32 x 4" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress industrial environments
• Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
• Black-oxide coating on alloy steel offers enhanced corrosion protection for extended service life
• 82° countersink angle with standard flat head profile enables flush mounting and clean aesthetic finishes
• Partially threaded design allows for precise clamping force control in multi-material applications
• 1/8" hex drive compatibility ensures secure tool engagement and prevents stripping during installation
• Fine UNF thread spacing delivers superior holding power in thinner materials and precision components

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this 10-32 UNF flat head screw addresses critical challenges in machinery assembly, aerospace components, and precision equipment manufacturing. The black-oxide alloy steel construction provides superior corrosion resistance while maintaining the 130,000 psi tensile strength required for structural integrity. The Class 3A thread fit ensures precise engagement in critical assemblies where vibration resistance is paramount, while the 82° countersink angle facilitates seamless integration in countersunk applications. The partially threaded configuration allows engineers to optimize clamping force distribution across joint interfaces, making it ideal for applications requiring precise load management and vibration dampening in automotive, industrial machinery, and electronic enclosures.

Specification Summary & Compliance

This 4" flat head screw features precision Class 3A thread fit with UNF fine thread spacing and right-hand threading. Manufactured to exacting standards including ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the latest industry requirements for hazardous substance restrictions and chemical safety.