S-90179A624 3/8"-16 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced Grip and Torque Application: Spade head design provides superior manual handling for quick tightening and loosening without tools, reducing assembly time in industrial settings.
• Increased Load Distribution and Stability: Integrated flange prevents over-tightening and distributes pressure evenly, minimizing surface damage and improving joint integrity.
• High Tensile Strength for Demanding Applications: 40,000 psi tensile strength ensures reliable performance under heavy loads and vibration, reducing risk of fastener failure.
• Durable Material Construction: Steel with Rockwell B55 hardness offers excellent resistance to wear and deformation, extending service life in repetitive use environments.
• Precision Thread Fit for Secure Fastening: Class 2A UNC coarse threads enable easy alignment and robust engagement, ideal for quick assembly/disassembly cycles.
• Full Threading for Maximum Holding Power: Fully threaded 1" length allows adjustable positioning and consistent clamping force across the entire fastener.
• Standardized Compatibility: 3/8"-16 UNC right-hand thread conforms to industry norms, ensuring interchangeability and simplified inventory management.

Professional Applications & Engineering Value

This steel thumb screw with flanged spade head addresses critical needs in machinery, electronics, and equipment maintenance where rapid access and secure fastening are paramount. The coarse UNC thread and Class 2A fit facilitate swift installation even in blind holes or misaligned setups, reducing downtime during adjustments. Engineered with Rockwell B55 hardness, it withstands repeated manual operations without stripping or deformation, making it ideal for industrial thumb screws in conveyor systems, panel fastening, and prototyping jigs. The flange acts as a built-in washer, eliminating the need for additional components and providing consistent seating on uneven surfaces, while the fully threaded design ensures uniform stress distribution for enhanced tensile strength in high-vibration environments.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy and easy assembly. It meets general industry specifications for steel fasteners, including typical compliance with RoHS and REACH directives for material safety. Manufacturing follows ASME/ANSI guidelines for thread geometry (3/8"-16) and mechanical properties, ensuring reliability in quick-release applications.