S-91253A026 0-80 x 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
• Precise Class 3A thread fit ensures secure, vibration-resistant connections in critical assemblies
• High tensile strength (130,000 psi) provides reliable performance under extreme mechanical stress
• Hex drive design allows for high-torque installation without cam-out risks
• 82° countersink angle enables flush mounting for streamlined surfaces and improved aesthetics
• Full threading maximizes grip length and load distribution across the entire fastener
• Rockwell C39 hardness maintains structural integrity against wear and deformation

Professional Applications & Engineering Value

Engineered for precision-critical applications, these 0-80 UNF flat head screws with fine thread spacing deliver exceptional clamping force in compact assemblies. The black-oxide alloy steel construction combats oxidation in humid or chemically exposed environments, while the hex drive facilitates secure tool engagement during high-torque installations. Ideal for electronics enclosures, aerospace components, and medical devices where Class 3A thread fit eliminates backlash in vibration-prone systems. The fully threaded design ensures uniform stress distribution, reducing the risk of joint failure in dynamic load conditions.

Specification Summary & Compliance

Manufactured to ASTM F835 specifications with Class 3A thread tolerance for precision fit. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Features UNF fine threads with 0-80 thread size, 1/2" length, and 82° countersink profile for standardized mounting applications.