S-90200A549 1/4"-20 x 1 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced manual grip and torque application with a fully knurled round head for secure handling without tools
• Superior corrosion resistance and durability thanks to the black-oxide steel finish, extending service life in harsh environments
• High tensile strength of 70,000 psi ensures reliable fastening under heavy loads and vibration
• Rockwell B84 hardness provides excellent wear resistance and maintains thread integrity over repeated use
• Low-profile head design allows for use in tight spaces while maintaining easy manual operation
• Precise Class 2A thread fit with UNC coarse threads for quick installation and secure engagement in various materials
• Full threading along the 1 1/2" length offers adjustable depth and consistent holding power

Professional Applications & Engineering Value

This black-oxide steel thumb screw is engineered to address common industrial challenges such as frequent adjustments and tool-free access in confined areas. The low-profile knurled head ensures a firm grip, reducing slippage and enhancing operator efficiency in assembly lines, machinery panels, and electronic enclosures. Made from robust steel with a Rockwell B84 hardness and 70,000 psi tensile strength, it withstands mechanical stress and repetitive use without compromising performance. The UNC 1/4"-20 coarse threads and Class 2A fit provide reliable fastening in metals and plastics, making it ideal for maintenance, prototyping, and OEM applications where durability and ease of use are critical.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured to meet RoHS 3 (2015/863/EU) compliance under exemption 6(a)-I for lead as an alloying element in steel and is REACH (EC 1907/2006) compliant, ensuring environmental and safety standards for industrial use.