S-99926A103 4-40 x 5/16" 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 18-8 stainless steel and passivated finish for long-lasting performance in harsh environments.
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness to withstand high-stress applications.
- Precise, reliable fastening ensured by Class 3A thread fit for tight tolerances and reduced risk of loosening.
- Flush, professional finish achieved with a 100° countersink angle and undercut flat head design for seamless mounting.
- Easy and secure installation with a hex drive (1/16") providing superior torque transfer and slip resistance.
- Versatile coarse threading (UNC) for quick assembly and reliable performance in various materials.
- Compliance with environmental regulations including RoHS 3 and REACH, ensuring safety and sustainability.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these 4-40 UNC flat head screws deliver critical reliability where precision and durability are non-negotiable. The 18-8 stainless steel construction, enhanced by a passivated finish, provides excellent resistance to corrosion, oxidation, and chemical exposure, making them ideal for electronics, machinery, and outdoor equipment. The undercut flat head and 100° countersink angle allow for a completely flush installation, preventing snagging and improving aerodynamics in assemblies. With a Class 3A thread fit and coarse thread spacing, these screws offer superior grip and vibration resistance, reducing maintenance needs and enhancing the longevity of your products in industrial applications.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 3A thread fit for high precision. It is manufactured with a partially threaded design, a length of 5/16", and a right-hand thread direction. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets strict environmental and safety standards for industrial use.
