S-91253A359 3/8"-24 x 1 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding industrial environments
• Exceptional mechanical strength with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
• Precision thread engagement with Class 3A fit ensuring reliable, vibration-resistant fastening in critical assemblies
• Optimized flush mounting with standard 82° countersink angle for seamless surface integration and aerodynamic profiles
• Enhanced installation control through 7/32" hex drive design providing superior torque transmission and slip resistance
• Full-thread engagement capability along the entire 1-1/2" length for maximum grip range and load distribution
• Industry-standard compliance meeting ASME B18.3 and ASTM F835 specifications for guaranteed interchangeability

Professional Applications & Engineering Value

These black-oxide alloy steel flat head socket cap screws deliver critical performance in precision engineering applications where surface flushness and high tensile strength are paramount. The UNF fine threading (3/8"-24) combined with Class 3A thread fit provides superior resistance to vibrational loosening in machinery, automotive, and aerospace assemblies. The 82° countersink angle ensures perfect flush mounting in jigs, fixtures, and precision equipment while the fully threaded design allows for adjustable clamping force across the entire engagement length. Engineered for durability, the black-oxide surface treatment provides effective corrosion protection without dimensional interference, making these socket cap screws ideal for OEM applications requiring reliable, high-strength fastening solutions.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 and ASTM F835 specifications, these flat head screws feature precision Class 3A thread fit with UNF fine threading (3/8"-24) for superior engagement. The black-oxide alloy steel construction delivers 130,000 psi tensile strength and Rockwell C39 hardness. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures suitability for global industrial applications requiring restricted substance control.