S-90181A583 5/16"-18 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Easy manual operation with large 7/8" wide spade head and 11/16" height for superior grip and torque without tools
• High-strength steel construction provides Rockwell B55 hardness and 40,000 psi tensile strength for reliable performance in demanding applications
• Precision Class 2A coarse UNC threads ensure smooth engagement and secure fastening with standard mating components
• Fully threaded 1" length offers maximum adjustment range and holding power throughout the entire fastener
• RoHS 3 compliance guarantees environmental safety and regulatory acceptance for industrial use
• Right-hand coarse threading enables quick installation and removal while maintaining vibration resistance
• Durable spade head design withstands repeated manual tightening without deformation or wear

Professional Applications & Engineering Value

This 5/16"-18 UNC thumb screw delivers exceptional value in applications requiring frequent access or adjustment where tools are impractical. The high-strength steel construction with Rockwell B55 hardness resists deformation under repeated manual operation, while the 40,000 psi tensile strength ensures reliable clamping force in industrial equipment, machinery guards, access panels, and electronic enclosures. The spade head design with generous 7/8" width provides superior leverage for hand-tightening, eliminating the need for specialized tools in maintenance-heavy environments. The coarse UNC threads with Class 2A fit prevent cross-threading and ensure consistent engagement, making these thumb screws ideal for production lines, manufacturing fixtures, and assembly stations where speed and reliability are critical.

Specification Summary & Compliance

This thumb screw features 5/16"-18 UNC coarse threads with Class 2A thread fit for standard compatibility and precise engagement. Manufacturing follows inch system specifications with fully threaded 1" length, 0.313" thread diameter, and right-hand thread direction. The product is RoHS 3 (2015/863/EU) compliant, meeting environmental regulations for industrial components. Material certification includes steel construction with verified Rockwell B55 hardness and 40,000 psi tensile strength for consistent performance.