S-90729A613 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 316 Stainless Steel material and passivated finish, ideal for harsh environments and extended service life.
- High-strength performance offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing in demanding applications.
- Precise thread engagement with Class 3A thread fit and UNC coarse thread spacing, ensuring secure fastening and vibration resistance.
- Efficient installation featuring a hex drive and fully threaded design for quick, tool-friendly assembly and consistent clamping force.
- Flush mounting capability due to the flat head with 100° countersink angle and undercut profile, providing a smooth surface finish.
- Strict dimensional control with head diameter tolerance of -0.01" to 0", guaranteeing consistent fit and alignment in precision assemblies.
- Regulatory compliance meeting RoHS 3 and REACH standards, ensuring safety and environmental responsibility for global industrial use.
Professional Applications & Engineering Value
This 4-40 UNC flat head screw in 316 Stainless Steel is engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The passivated finish enhances its resistance to chemicals and moisture, making it suitable for marine, chemical processing, and outdoor equipment. The Class 3A thread fit and coarse thread spacing provide excellent grip in softer materials or where rapid installation is needed, reducing the risk of strip-out. With a hex drive and fully threaded design, it allows for high-torque application and uniform stress distribution, ideal for securing components in machinery, electronics, and automotive systems where reliability and durability are critical.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy. It features a right-hand thread, 5/16" length, and head diameter tolerance of -0.01" to 0" to ensure consistent performance. Manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for industrial fasteners.
