S-90096A434 1/4"-20 x 3/8" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments.
• High-torque installation capability via the external hex drive, ensuring secure fastening and reducing tool slippage.
• Enhanced vibration resistance with the serrated locking flange, providing a reliable grip that prevents loosening under dynamic loads.
• Efficient thread cutting in tough materials like aluminum, brass, and cast iron, eliminating the need for pre-tapped holes and speeding up assembly.
• Broad material compatibility with coarse UNC threads, offering strong holding power in sheet metal and various non-ferrous metals.
• Full threading for maximum engagement, ensuring consistent clamping force along the entire length for improved joint integrity.
• Simplified inventory management by meeting ASME B18.6.3 standards, guaranteeing interchangeability and reliability in OEM and MRO applications.

Professional Applications & Engineering Value

This 1/4"-20 zinc-plated steel flanged hex tapping screw is engineered to address common challenges in metalworking and assembly, such as stripping threads and vibration-induced failures. The thread cutting design (Type F) allows it to form precise UNC coarse threads directly into materials like aluminum, brass, cast iron, and sheet metal, reducing installation time and labor costs. The serrated flange acts as a built-in lock washer, distributing load evenly and minimizing loosening in high-stress environments. Combined with the external hex drive for high torque application, it ensures durable fastening in automotive, machinery, and construction sectors where reliability is critical.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with full threading and blunt tip, adhering to Class 2A tolerance for consistent fit. It complies with ASME B18.6.3 specifications (SAE J933) for dimensional accuracy and performance. The product is RoHS 3 (2015/863/EU) compliant, ensuring it meets environmental regulations for hazardous substance restrictions, making it suitable for global industrial supply chains.