S-91253A002 10-32 x 1/4" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with 130,000 psi tensile strength and Rockwell C39 hardness for reliable performance in demanding applications
• Superior corrosion resistance thanks to black-oxide coating that protects against rust and extends service life
• Precise Class 3A thread fit ensures tight, secure fastening with minimal vibration loosening in critical assemblies
• Easy installation and removal with hex drive design providing superior torque transmission and reduced tool slippage
• Optimal flush mounting with 82° countersink angle and flat head design for smooth surface finishes
• Full threading capability allows complete engagement along the entire 1/4" length for maximum holding power
• Industry-standard compliance meets ASME B18.3 and ASTM F835 specifications for guaranteed quality and interoperability

Professional Applications & Engineering Value

These 10-32 UNF flat head screws with Class 3A thread fit deliver exceptional engineering value in precision assemblies requiring reliable fastening solutions. The black-oxide alloy steel construction provides superior corrosion resistance while maintaining high tensile strength (130,000 psi) for demanding industrial environments. The hex drive design ensures maximum torque transmission during installation, reducing the risk of fastener damage in automated assembly processes. The 82° countersink angle and flat head profile create seamless surface finishes in machinery, electronic enclosures, and precision equipment where vibration resistance and flush mounting are critical. These fully threaded fasteners are ideal for applications requiring consistent clamping force across the entire engagement length.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread tolerances with UNF fine thread spacing (10-32) and right-hand threading. Complies with ASME B18.3 and ASTM F835 manufacturing standards, ensuring dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements for hazardous substances. The black-oxide surface treatment provides additional corrosion protection while maintaining the high-strength characteristics of alloy steel substrate.