S-90181A636 3/8"-16 x 3" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual tightening and loosening with a spade-shaped thumb head design, eliminating the need for tools in quick-adjustment scenarios.
• Superior grip and load distribution from fully threaded coarse UNC spacing, ensuring secure fastening in high-vibration industrial environments.
• Enhanced durability and wear resistance thanks to steel construction with Rockwell B55 hardness, extending service life under repetitive use.
• Reliable tensile strength up to 40,000 psi for withstanding heavy loads and mechanical stress in demanding applications.
• Precise and consistent thread engagement with Class 2A thread fit, reducing cross-threading risks and improving assembly efficiency.
• Versatile right-hand threading compatible with standard UNC nuts and tapped holes, facilitating easy integration into existing systems.
• Optimal length of 3 inches providing ample thread engagement for deep or thick material sections, enhancing connection stability.

Professional Applications & Engineering Value

This heavy-duty thumb screw is engineered to address common industrial challenges such as frequent adjustments, tool-free access needs, and vibration-induced loosening. The steel material and Rockwell B55 hardness ensure it withstands mechanical wear and corrosion in harsh conditions, while the spade head design allows for quick hand-tightening in confined spaces. Ideal for machinery panels, electronic enclosures, and jig fixtures, the fully threaded 3/8"-16 UNC coarse thread provides maximum holding power and resists back-off, reducing maintenance downtime. Its right-hand thread direction and Class 2A fit guarantee compatibility with standard components, streamlining procurement and assembly processes for engineers and OEMs.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy and interchangeability. Key specifications include a 3/8"-16 thread size, coarse thread spacing, and fully threaded 3-inch length. Manufactured from high-grade steel, it meets industry requirements for hardness and tensile strength. The product complies with relevant industrial fastening specifications and is suitable for applications demanding reliability and repeatability, though specific certifications like RoHS or ASME should be verified per batch requirements.