S-90732A420 1/4"-20 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual tightening and loosening with the thumb head and external hex drive, eliminating the need for tools in frequent adjustments.
• Superior corrosion resistance from the black-oxide steel finish, ensuring long-term durability in various industrial environments.
• High-strength performance with a 70,000 psi tensile strength and Rockwell B84 hardness, providing reliable clamping force for demanding applications.
• Quick and secure coarse threading with UNC 1/4"-20 and Class 2A fit, enabling fast assembly and reduced cross-threading risk.
• Full thread engagement along the 1 1/4" length, offering versatile positioning and a firm grip across the entire fastener.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for regulated industries.
• Right-hand thread direction for standard, intuitive installation that aligns with common assembly practices.

Professional Applications & Engineering Value

This heavy-duty thumb screw is engineered to solve critical challenges in industrial assembly and maintenance. The black-oxide steel construction provides a protective layer that resists rust and wear, making it ideal for applications in machinery, electronics enclosures, and automotive components where exposure to moisture or harsh conditions is a concern. The UNC coarse thread and Class 2A thread fit ensure rapid installation with minimal effort, reducing assembly time and labor costs. Its fully threaded design and external hex drive offer versatility for adjustments and secure fastening in tight spaces, enhancing operational efficiency. With a 70,000 psi tensile strength, it delivers reliable performance in high-stress environments, preventing failures and maintenance downtime. This fastener is a practical solution for engineers seeking a durable, compliant, and easy-to-use component for repetitive or tool-free access needs.

Specification Summary & Compliance

This thumb screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent engagement and UNC 1/4"-20 coarse thread specifications. It is manufactured to meet industry requirements for thread spacing and right-hand direction. The product complies with RoHS 3 (2015/863/EU) with exemption 6(a)-I and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for global supply chains.