S-90729A615 4-40 x 1/2" Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
- Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Optimized flush mounting featuring undercut flat head profile and 100° countersink angle for seamless surface integration
- Efficient installation with hex drive design allowing high-torque application and reduced tool slippage
- Full-threaded length providing maximum grip strength and uniform stress distribution across connected materials
- Regulatory compliance meeting RoHS 3 and REACH standards for safe use in regulated industries
Professional Applications & Engineering Value
Engineered for demanding applications, these 4-40 UNC flat head screws in 316 stainless steel address critical challenges in machinery assembly, marine equipment, and chemical processing systems. The passivated finish significantly enhances corrosion resistance against chlorides and acidic environments, while the Class 3A thread fit maintains precise tolerances for vibration-prone applications. The undercut flat head profile with 100° countersink angle ensures flush seating without protrusion, preventing material interference in precision instruments and aerospace components. These fully threaded fasteners deliver uniform clamping force across the entire 1/2" length, making them ideal for securing thin-gauge metals and composite materials where joint integrity is paramount.
Specification Summary & Compliance
Manufactured to exacting standards, these screws feature UNC coarse threads with Class 3A fit for precision assembly. Dimensions include 1/2" length, 0.255" head diameter with -0.01" to 0" tolerance, and 1/16" hex drive. The 316 stainless steel construction provides 70,000 psi tensile strength and Rockwell B70 hardness. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability.
