S-90179A546 1/4"-20 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Hand-tightening efficiency with a spade head design for maximum torque application without tools
• Enhanced load distribution from the integrated flange, reducing surface pressure and preventing loosening
• Superior durability with Rockwell B55 hardness and 40,000 psi tensile strength for repeated use in demanding environments
• Quick assembly enabled by coarse UNC threads and Class 2A fit, ensuring smooth engagement and time savings
• Full threading versatility allowing secure fastening at any point along the 1 1/2" length
• Reliable right-hand threading for standard industrial applications, minimizing installation errors
• Robust steel construction providing consistent performance and resistance to wear in mechanical assemblies

Professional Applications & Engineering Value

This 1/4"-20 thumb screw is engineered to address common industrial challenges like frequent adjustments and tool-free access requirements. The steel material, combined with Rockwell B55 hardness, ensures it withstands mechanical stress in applications such as machinery panels, electronic enclosures, and prototyping fixtures. The spade head offers excellent grip for high-torque manual tightening, while the flanged design increases stability and distributes clamping force evenly, preventing damage to softer materials. With its UNC coarse thread and Class 2A fit, it enables rapid installation and removal, reducing downtime in production lines and maintenance tasks. Ideal for industrial thumb screw uses where reliability and ease of operation are critical.

Specification Summary & Compliance

This product adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It meets general industrial specifications for inch-based fasteners, including precise thread size (1/4"-20), length (1 1/2"), and flange diameter (0.438"). Manufactured from high-quality steel, it complies with common industry requirements for mechanical properties, though specific certifications like RoHS or REACH should be verified per batch. The design ensures compatibility with standard coarse thread applications, supporting reliable performance in various assembly environments.