S-91253A844 3/4"-10 x 2 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 130,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance provided by black-oxide coating on alloy steel, extending service life in harsh environments
• Precise thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance
• Optimized installation efficiency through 1/2" hex drive design allowing high torque application without slippage
• Flush mounting capability with standard 82° countersink angle for smooth surface finishes
• Enhanced durability from Rockwell C37 hardness maintaining structural integrity under repeated stress
• Full-thread coverage along the 2-1/4" length providing maximum grip strength throughout the fastener

Professional Applications & Engineering Value

These 3/4"-10 UNC flat head screws deliver critical engineering solutions for industrial assembly challenges. The black-oxide alloy steel construction combined with Class 3A thread fit addresses common issues of corrosion and loosening under vibration in heavy machinery, structural frameworks, and manufacturing equipment. The coarse thread spacing enables faster installation in tough materials while the fully threaded design ensures uniform stress distribution. The 82° countersink angle provides seamless integration into precision components, making these hex drive screws ideal for applications requiring flush surfaces and high clamping force. Engineered to withstand extreme mechanical stresses, these fasteners maintain integrity in construction, automotive, and industrial maintenance applications where reliability is paramount.

Specification Summary & Compliance

Manufactured to exact inch system dimensions with Class 3A thread fit tolerance for precision alignment. Complies with ASTM F835 specifications for mechanical properties and performance standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features UNC coarse thread profile with right-hand direction and standard flat head profile. The combination of Rockwell C37 hardness and 130,000 psi tensile strength ensures consistent performance across industrial applications.