S-90585A022 5-40 x 1/2" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish for extended service life in harsh environments
• Exceptional tensile strength rated at 70,000 psi ensures reliable performance under high-stress conditions
• Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
• Optimized hex drive design (5/64") enables secure tool engagement and prevents stripping during installation
• 82° countersink angle ensures flush mounting and clean aesthetic finish in precision applications
• Full threading along the entire 1/2" length maximizes grip strength and load distribution
• Rockwell B55 hardness maintains structural integrity and thread form under repeated use

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 5-40 UNC flat head screws in 316 Stainless Steel provide critical corrosion resistance where exposure to chemicals, moisture, or extreme temperatures would compromise ordinary fasteners. The hex drive design combined with Class 3A thread fit ensures secure installation in high-vibration machinery, electrical enclosures, and precision equipment where loosening could cause operational failure. The passivated finish enhances surface durability while the 82° countersink creates seamless integration in automotive, marine, and food processing applications requiring both structural reliability and clean line aesthetics.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread tolerance for precision fit. The UNC coarse thread (5-40) provides optimal engagement in various materials. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Head diameter maintains tight tolerance (-0.041" to 0") for consistent countersink performance across production runs.