S-90210A214 5/16"-18 x 2 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced Grip & Easy Manual Operation: Knurled round head with 1 1/8" diameter and low profile provides superior finger-tip control for quick adjustments without tools.
• High Tensile Strength for Demanding Applications: Black-oxide steel construction delivers a robust 70,000 psi tensile strength, ensuring reliable performance under stress.
• Removable Swivel Tip Protects Surfaces: The 0.25" diameter swivel tip with a 10° maximum swivel angle prevents marring and distributes pressure evenly on sensitive components.
• Precision Threading for Secure Fastening: 5/16"-18 UNC coarse threads with a Class 2A thread fit enable rapid installation and consistent, secure engagement.
• Full-Length Threading for Maximum Versatility: The 2 1/2" length is fully threaded, allowing for adjustable grip range and flexible use in various material thicknesses.
• Durable Corrosion-Resistant Finish: Black-oxide coating on steel offers improved resistance to rust and wear, extending the screw's service life.
• Compliant with Environmental Standards: Meets RoHS 3 (2015/863/EU) requirements, ensuring safe use in regulated industrial environments.

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to address common challenges in industrial assembly and maintenance, where frequent adjustments and component protection are critical. The removable swivel tip is ideal for applications involving delicate surfaces, such as electronic enclosures or precision machinery, as it minimizes surface damage while maintaining clamping force. The coarse UNC threads and fully threaded 2 1/2" length allow for quick, tool-free installation in varied material depths, reducing assembly time in production lines. With a 70,000 psi tensile strength and knurled head for secure handling, this screw ensures reliable performance in high-vibration environments, making it a valuable component for machinery, automotive, and equipment manufacturing sectors.

Specification Summary & Compliance

This thumb screw adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNC coarse thread specifications (5/16"-18). It is manufactured in the inch system with a total length of 2 1/2" and is fully threaded. The product complies with RoHS 3 (2015/863/EU) regulations, including exemption 6(a)-I for lead as an alloying element in steel, ensuring it meets environmental and safety requirements for industrial use.