S-90165A527 1/2"-13 x 4 5/16" Thumb Screws

Key Features & Benefits at a Glance

• Effortless hand-tightening with a large four-arm thumb head (2 1/2" width, 1 1/8" height) for superior grip and torque without tools
• Exceptional durability and corrosion resistance provided by the black-oxide steel finish, extending service life in demanding environments
• High mechanical strength with 180,000 psi tensile strength and Rockwell C40 hardness to withstand heavy loads and prevent stripping
• Secure and adaptable fastening thanks to the removable swivel tip that allows for a 10° angular adjustment to accommodate misaligned holes
• Reliable and precise threading with a Class 2A thread fit and coarse UNC thread for quick assembly and consistent performance
• Full-length threading ensures maximum engagement and holding power along the entire 4 5/16" length
• Compliance with international regulations including RoHS 3 and REACH, ensuring safe and environmentally responsible use in global markets

Professional Applications & Engineering Value

This heavy-duty thumb screw is engineered to solve common industrial fastening challenges where tool-less operation, high strength, and adjustability are critical. The black-oxide steel construction offers excellent resistance to rust and wear, making it ideal for machinery, electrical enclosures, and assembly jigs exposed to harsh conditions. The four-arm thumb head design allows operators to apply significant torque by hand, reducing assembly time and eliminating the need for wrenches in tight spaces. The removable swivel tip with a 10° maximum angle accommodates minor misalignments, preventing cross-threading and ensuring a secure fit in dynamic applications. With its coarse UNC thread and full threading, it provides rapid installation and reliable performance in industrial thumb screw applications requiring frequent adjustments or high vibration resistance.

Specification Summary & Compliance

This thumb screw features a 1/2"-13 UNC coarse thread with a Class 2A thread fit for standard tolerance and easy assembly. It is manufactured from high-strength steel with a black-oxide surface treatment and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring it is free of hazardous substances and suitable for use in regulated industries.