S-90732A390 1/4"-20 x 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced Grip and Torque Application: The external hex drive and thumb head design allow for easy manual tightening without tools, reducing assembly time and improving efficiency in maintenance tasks.
• Superior Durability and Corrosion Resistance: Made from black-oxide steel, these screws offer excellent protection against rust and wear, ensuring long-lasting performance in harsh industrial environments.
• High Tensile Strength for Heavy-Duty Use: With a tensile strength of 70,000 psi and Rockwell B84 hardness, they withstand high stress and vibration, minimizing the risk of failure in demanding applications.
• Precise and Reliable Threading: Fully threaded with UNC coarse threads and Class 2A fit, providing secure fastening and easy installation in various materials without cross-threading issues.
• Compliance with Safety Standards: RoHS 3 and REACH compliant, ensuring they meet environmental and health regulations for safe use in industrial and electronic assemblies.
• Versatile Right-Hand Thread Design: Standard right-hand threading simplifies installation and removal, making them ideal for repetitive adjustments in machinery and equipment.
• Optimized Dimensions for Secure Fit: The 1/4"-20 thread size and 3/4" length offer a balanced grip and penetration, suitable for a wide range of panel and enclosure fastening needs.

Professional Applications & Engineering Value

These black-oxide steel thumb screws are engineered to address common industrial challenges, such as frequent adjustments and exposure to corrosive conditions. The combination of UNC coarse threading and external hex drive ensures quick, tool-free installation, reducing downtime in assembly lines or maintenance workflows. With a tensile strength of 70,000 psi and Rockwell B84 hardness, they provide reliable performance in high-vibration environments, like machinery panels or electronic enclosures, where loosening can lead to operational failures. The fully threaded design and Class 2A thread fit enhance grip stability, preventing slippage in materials such as metal or plastic. Ideal for applications in manufacturing, automotive, and electronics, these screws offer a durable, compliant solution that meets rigorous industrial safety standards, ensuring long-term reliability and reduced replacement costs.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 2A thread fit for consistent accuracy and UNC coarse threads with a 1/4"-20 size. It complies with RoHS 3 (2015/863/EU) under exemption 6(a)-I for lead as an alloying element in steel and REACH (EC 1907/2006) regulations, ensuring environmental and health safety. Manufactured to meet industrial specifications for tensile strength and hardness, it is fully threaded and right-hand threaded for reliable performance in various fastening scenarios.