S-90729A411 1/4"-20 x 1/2" Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive Flat Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and chemical exposure.
- Exceptional thread reliability provided by Class 3A fit, ensuring precise, vibration-resistant connections in critical assemblies.
- Enhanced durability and surface protection from the passivated finish, extending service life by preventing oxidation and galling.
- Efficient installation and high torque capability with the 1/8" hex drive, reducing assembly time and minimizing tool slippage.
- Flush, low-profile seating thanks to the undercut flat head and 100° countersink angle, perfect for streamlined surfaces.
- Robust mechanical performance with 70,000 psi tensile strength and Rockwell B70 hardness, supporting heavy-duty applications.
- Full threading for maximum grip along the 1/2" length, providing consistent holding power across the entire fastener.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this 1/4"-20 UNC Flat Head Screw in 316 Stainless Steel addresses common challenges like corrosion-induced failure and loosening under stress. The Class 3A thread fit and coarse threading deliver superior resistance to vibration, making it ideal for machinery, marine equipment, and structural frameworks where reliability is non-negotiable. Its passivated finish enhances longevity in aggressive environments, while the hex drive and undercut head facilitate quick, secure installations without protrusions. These features collectively minimize maintenance needs and downtime, offering a dependable solution for high-performance fastening in sectors from manufacturing to chemical processing.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a precise Class 3A thread fit and dimensional accuracy, including a head diameter of 0.531" (tolerance -0.01" to 0") and length of 1/2". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global industrial use.
