S-90210A211 5/16"-18 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and torque application with a fully knurled 1 1/8" diameter head for secure hand-tightening in low-clearance or high-vibration environments.
• Superior corrosion resistance provided by the black-oxide steel finish, extending the screw's service life in various industrial conditions.
• High-strength performance with a tensile strength of 70,000 psi, ensuring reliable fastening under significant mechanical stress.
• Reduced surface marring and improved alignment thanks to the removable swivel tip, which accommodates a 10° maximum angle for off-axis fastening.
• Wide compatibility and easy installation with a 5/16"-18 UNC coarse thread and Class 2A fit, designed for quick assembly in standard tapped holes.
• Low-profile, round head design (3/8" height) for applications where space is limited, without sacrificing functionality.
• Compliance with environmental standards, being RoHS 3 compliant, making it suitable for use in regulated industries and global markets.

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to address common challenges in industrial assembly, maintenance, and prototyping. The knurled head ensures a firm grip, even with oily hands or gloves, reducing slippage and improving operator efficiency. Its fully threaded 5/16"-18 UNC coarse thread and Class 2A fit provide reliable engagement in a variety of materials, from metal panels to plastic housings, minimizing cross-threading risks. The removable swivel tip is particularly valuable for applications requiring frequent adjustments or where perpendicular alignment is difficult, protecting sensitive surfaces from damage. Ideal for use in electronic enclosures, machinery guards, and jig fixtures, this screw combines durability with user-friendly design to streamline repetitive fastening tasks in demanding environments.

Specification Summary & Compliance

This thumb screw adheres to Unified Coarse (UNC) thread standards with a Class 2A tolerance for consistent fit and performance. It is fully threaded with a right-hand thread direction and is manufactured from black-oxide steel for enhanced corrosion protection. The product is RoHS 3 (2015/863/EU) compliant with exemption 6(a)-I for lead as an alloying element in steel, ensuring it meets strict environmental regulations for industrial components.