S-93005A170 1/2"-13 x 3 1/16" Thumb Screws

Key Features & Benefits at a Glance

• Effortless manual operation with a large 2 1/2" wide, four-arm aluminum head for superior grip and torque application without tools.
• Enhanced durability and corrosion resistance from the black-oxide steel finish, extending service life in demanding environments.
• Reliable high-strength performance with a 70,000 psi tensile strength and Rockwell C40 hardness to withstand significant loads and stress.
• Secure and precise fit ensured by the Class 2A UNC coarse thread, providing consistent engagement and reducing cross-threading risks.
• Versatile fastening for various material thicknesses due to the 2 3/4" partially threaded design and extended tip for easier alignment.
• Stable seating and alignment from the integrated collar (1 1/16" diameter), minimizing wobble and improving installation accuracy.
• Compliance with environmental regulations as it is RoHS 3 compliant, meeting industry standards for safe and responsible manufacturing.

Professional Applications & Engineering Value

This 1/2"-13 UNC thumb screw is engineered to solve common industrial fastening challenges, such as the need for quick assembly and disassembly without specialized tools. The black-oxide steel construction offers excellent resistance to rust and wear, making it ideal for machinery, enclosures, and equipment panels exposed to harsh conditions. The aluminum four-arm head provides a comfortable, high-torque grip, reducing operator fatigue during frequent adjustments. With its coarse thread and Class 2A fit, it ensures rapid installation and reliable holding power in wood, metal, and plastic applications, while the partially threaded shank and extended tip facilitate easy insertion and alignment, minimizing damage to components. This design is perfect for maintenance-heavy environments where speed, strength, and durability are critical.

Specification Summary & Compliance

This thumb screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy and interchangeability. Key specifications include a thread size of 1/2"-13, overall length of 3 1/16", thread length of 2 3/4", and collar dimensions of 1 1/16" diameter by 1" height. It complies with RoHS 3 (2015/863/EU) regulations, including exemption 6(a)-I for lead as an alloying element in steel, ensuring environmental safety and industry conformity.