S-90181A585 5/16"-18 x 1 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Easy manual operation with spade head design requiring no tools for quick adjustments
• Superior durability from steel construction with Rockwell B55 hardness resisting wear and deformation
• High load capacity with 40,000 psi tensile strength for demanding industrial applications
• Reliable thread engagement through full threading and Class 2A fit ensuring secure fastening
• Quick installation with coarse UNC threads enabling faster assembly in various materials
• Environmental compliance meeting RoHS 3 standards for safe use in regulated industries
• Versatile compatibility with standard 5/16"-18 UNC components across equipment and machinery

Professional Applications & Engineering Value

This heavy-duty thumb screw addresses critical needs in industrial environments where frequent access and reliability are paramount. The steel construction with Rockwell B55 hardness provides exceptional resistance to mechanical stress, while the fully threaded UNC coarse thread design ensures maximum holding power in panels, fixtures, and machinery components. The spade head offers ergonomic hand-tightening capability, eliminating tool requirements for maintenance-heavy applications such as access panels, electronic enclosures, and production jigs. With 40,000 psi tensile strength, it maintains integrity under vibration and load variations, making it ideal for manufacturing equipment, automotive assemblies, and industrial controls where repeated disassembly is necessary without compromising fastener performance.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with 1-1/4" length and 5/16"-18 UNC coarse threads meeting Class 2A thread fit tolerances for consistent compatibility. Features right-hand thread direction and full threading along the shank. Compliant with RoHS 3 (2015/863/EU) environmental regulations, ensuring restriction of hazardous substances in industrial applications.