S-92210A643 3/8"-24 x 1 1/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish, ideal for harsh environments and long-term reliability.
• Exceptional tensile strength rated at 70,000 psi, ensuring secure fastening under high-stress industrial conditions.
• Precision Class 3A thread fit for tighter tolerances and reduced risk of cross-threading, enhancing assembly efficiency.
• Optimized for flush mounting with an 82° countersink angle and standard flat head profile, providing a smooth, professional finish.
• Easy installation and removal using a 7/32" hex drive, minimizing tool slippage and damage in repetitive applications.
• Full threading along the 1-1/4" length allows for maximum grip and adjustability in various material thicknesses.
• Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory acceptance.

Professional Applications & Engineering Value

This 3/8"-24 UNF flat head screw is engineered to address common industrial challenges such as vibration loosening and environmental degradation. Constructed from 18-8 Stainless Steel with a passivated finish, it resists rust and chemical exposure, making it suitable for machinery, marine equipment, and outdoor structures. The Class 3A thread fit and fine thread spacing provide superior clamping force and fatigue resistance, critical in dynamic loads. Its 82° countersink angle ensures a seamless fit in pre-drilled holes, reducing protrusion risks. Ideal for heavy-duty fastening in automotive, aerospace, and construction sectors, this screw delivers consistent performance where precision and durability are paramount.

Specification Summary & Compliance

This product adheres to Class 3A thread fit per UNF standards, ensuring high precision and interchangeability. It meets ASME B18.3 specifications for dimensional accuracy and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances. The screw features a right-hand thread direction, fully threaded design, and is manufactured to maintain consistent hardness (Rockwell B55) and tensile strength (70,000 psi) across batches.