S-90079A585 5/16"-18 x 1" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and torque application with a large 1-1/8" diameter knurled head for secure hand-tightening without tools
• Superior corrosion resistance and durability thanks to the black-oxide steel construction, extending service life in demanding environments
• Reliable fastening strength with a tensile strength of 70,000 psi and Rockwell B84 hardness for heavy-duty industrial applications
• Easy alignment and quick installation provided by the extended tip and coarse UNC threading for faster assembly
• Precise thread fit with Class 2A tolerance ensuring consistent engagement and reduced risk of cross-threading
• Versatile partial threading allowing for adjustable clamping force and secure positioning in various materials
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe and sustainable use in global markets

Professional Applications & Engineering Value

This 5/16"-18 UNC thumb screw is engineered to address common challenges in industrial settings, such as the need for rapid, tool-free adjustments and robust fastening under vibration or load. The black-oxide steel material offers excellent resistance to rust and wear, making it ideal for machinery, electronic enclosures, and assembly jigs where frequent access is required. The knurled head provides a non-slip surface, enabling operators to apply sufficient torque by hand even with gloves, while the coarse thread and extended tip facilitate quick starts and secure fits in coarse materials like metal or plastic. Its partially threaded design allows for precise depth control, reducing the risk of over-tightening and material damage, which is critical in precision equipment and repetitive maintenance tasks.

Specification Summary & Compliance

This thumb screw adheres to UNC coarse thread standards with a Class 2A thread fit for consistent dimensional accuracy and reliable performance. It meets RoHS 3 (2015/863/EU) with exemption 6(a)-I and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for international industrial use. The specifications include a thread size of 5/16"-18, a length of 1", and partial threading, all manufactured to support high tensile strength and durability in accordance with industry benchmarks.