S-91253A853 3/4"-10 x 4 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• High tensile strength of 130,000 psi ensures reliable performance under extreme loads
• Precise Class 3A thread fit provides superior engagement and vibration resistance
• Rockwell C37 hardness maintains structural integrity and prevents thread deformation
• 1/2" hex drive design enables secure installation with standard industrial tools
• Partial threading configuration optimizes clamping force distribution
• Full regulatory compliance meets ASTM F835, RoHS 3 and REACH standards

Professional Applications & Engineering Value

These 3/4"-10 UNC flat head screws deliver critical engineering advantages for heavy machinery, structural steel frameworks, and industrial equipment assembly. The black-oxide alloy steel construction provides superior protection against rust and chemical exposure in demanding environments. The coarse UNC threading ensures rapid installation and superior holding power in structural applications, while the 82° countersink angle creates a flush surface finish critical for safety and aesthetics. With partial threading and Class 3A fit, these screws maintain consistent clamping force while resisting loosening from vibration - making them ideal for construction equipment, heavy-duty manufacturing, and infrastructure projects requiring reliable, high-performance fastening solutions.

Specification Summary & Compliance

Manufactured to exacting Class 3A thread fit standards with UNC coarse threading (3/4"-10) and 1/2" hex drive compatibility. These 4 1/2" length screws feature partial threading with minimum 2" thread engagement and maintain dimensional accuracy per ASTM F835 specifications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across global industrial markets.