S-90585A038 1/4"-20 x 7/16" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh environments and extended service life.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty fastening applications.
• Precision thread fit with Class 3A UNC coarse threads ensuring secure, vibration-resistant connections and easy assembly.
• Optimal flush mounting featuring a standard 82° countersink angle and flat head design for a smooth, finished surface.
• Efficient installation and removal enabled by a hex drive (5/32") that provides excellent torque transfer and reduces tool slippage.
• Full thread engagement along the 7/16" length for maximum grip and load distribution in various material thicknesses.
• Regulatory compliance and quality assurance meeting ASME B18.3 specifications, RoHS 3, and REACH standards for safe, global use.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 1/4-20 UNC Flat Head Screws in 316 Stainless Steel address critical challenges like corrosion, high stress, and assembly efficiency. The passivated finish enhances durability against chemicals and moisture, making them suitable for marine, chemical processing, and outdoor equipment. With a Class 3A thread fit and coarse threading, they provide robust, vibration-resistant fastening in metals and plastics, reducing the risk of loosening. The flat head with an 82° countersink ensures a flush fit, minimizing protrusions in machinery and structural assemblies. Ideal for precision screws in automotive, aerospace, and construction, they deliver consistent performance where reliability and compliance with ASME B18.3 are paramount.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a head diameter of 0.531" with a tolerance of -0.051" to 0", and features UNC coarse threads with a Class 3A fit for high accuracy. Manufacturing follows ASME B18.3 standards, ensuring consistent quality and interchangeability. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) confirms environmental safety and regulatory adherence for industrial applications.