S-90179A583 5/16"-18 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual tightening with a large 3/4" high spade head and flanged design for superior grip and torque application without tools.
• Enhanced durability and load-bearing capacity from high-strength steel construction with a Rockwell B55 hardness and 40,000 psi tensile strength.
• Reliable and fast coarse threading with UNC 5/16"-18 threads and Class 2A fit for quick assembly and secure fastening in various materials.
• Increased stability and distribution of load due to the integrated flange with a 0.563" diameter, preventing over-tightening and surface damage.
• Full-length right-hand threading ensures maximum thread engagement and holding power along the entire 1" length of the screw.
• Compliance with stringent environmental standards as it is RoHS 3 compliant, making it suitable for use in regulated industries.
• Versatile for industrial applications with its robust inch-system design, ideal for machinery, panels, and equipment requiring frequent adjustments.

Professional Applications & Engineering Value

This 5/16"-18 UNC Thumb Screw is engineered to solve common industrial fastening challenges where tool-less operation and frequent access are required. The steel construction, combined with a Rockwell B55 hardness and 40,000 psi tensile strength, ensures it withstands repeated use and high-stress environments without stripping or deforming. The flanged spade head design provides a larger contact surface, reducing the risk of damage to components during manual tightening and offering excellent leverage. Its fully threaded coarse thread (UNC) with a Class 2A fit allows for rapid installation and secure holds in wood, metal, and plastic assemblies, making it ideal for applications in electronics enclosures, machinery guards, and automotive panels where quick disassembly is critical for maintenance.

Specification Summary & Compliance

This thumb screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent performance and interchangeability. It conforms to UNC thread specifications (5/16"-18) with coarse spacing, ensuring reliable engagement. The product is manufactured to meet industry requirements and is RoHS 3 (2015/863/EU) compliant, confirming it is free from hazardous substances, suitable for global industrial and electronic applications.