S-90181A540 1/4"-20 x 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Easy hand-tightening operation with a wide spade head design for quick assembly and disassembly without tools
• Exceptional durability thanks to steel construction with Rockwell B55 hardness, resisting wear in frequent-use applications
• High load-bearing capability with 40,000 psi tensile strength, ensuring secure fastening under stress
• Reliable thread engagement from fully threaded UNC coarse threads, providing consistent grip and reducing cross-threading risks
• Precise fit and interchangeability with Class 2A thread fit, meeting standard inch system requirements for seamless integration
• Environmental compliance with RoHS 3 regulations, making it safe for use in regulated industrial and electronic assemblies
• Versatile right-hand threading for standard installation in machinery, fixtures, and equipment requiring manual adjustments

Professional Applications & Engineering Value

This 1/4-20 thumb screw is engineered to address common challenges in industrial settings where tool-free, rapid access is critical. The steel material, combined with Rockwell B55 hardness, ensures longevity in high-cycle applications, reducing replacement frequency and maintenance costs. Its spade head offers ample surface area for comfortable hand-tightening, ideal for panels, access doors, and adjustable components in machinery, electronics, and automotive assemblies. The fully threaded UNC coarse thread design enhances grip in softer materials and resists loosening from vibrations, while the Class 2A fit guarantees consistent performance in standard inch-based systems. By incorporating RoHS 3 compliance, it meets strict environmental standards, making it a reliable choice for OEMs and MRO professionals seeking efficient, durable, and compliant fastening solutions.

Specification Summary & Compliance

This thumb screw adheres to precise dimensional standards, including a 1/4"-20 UNC coarse thread with Class 2A thread fit for reliable interchangeability and tolerance in inch-based applications. Manufactured under strict guidelines, it complies with RoHS 3 (2015/863/EU) regulations, ensuring it is free from hazardous substances. The specifications cover a length of 3/4", full threading, and right-hand thread direction, supporting consistent performance in industrial environments.