S-91882A431 5/16"-18 x 1/2" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Enhanced grip and torque application with a large 1 1/4" diameter knurled head for easy hand-tightening without tools
- Superior corrosion resistance and durability from 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
- Coarse UNC threads with Class 2A fit allow for quick assembly and reliable engagement in various materials
- Fully threaded 1/2" length offers maximum adjustability and holding power along the entire shank
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets international standards for industrial use
Professional Applications & Engineering Value
This 5/16"-18 UNC thumb screw is engineered for applications requiring frequent adjustments and secure fastening without specialized tools. The black-oxide steel construction resists rust and wear, making it ideal for industrial machinery, electronic enclosures, and assembly jigs where corrosion could compromise performance. The knurled head and raised profile provide exceptional manual grip, reducing installation time and minimizing slip-related injuries. With its coarse thread and Class 2A thread fit, it ensures consistent performance in metals and plastics, solving common issues of cross-threading and loosening under dynamic loads. Fully threaded for versatile positioning, this screw delivers reliable tensile strength in maintenance-heavy and high-vibration environments.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for precise dimensional accuracy and easy assembly. It is manufactured from high-strength steel with a black-oxide surface treatment and meets RoHS 3 (2015/863/EU) compliance under exemption 6(a)-I for lead as an alloying element in steel, as well as REACH (EC 1907/2006) standards, ensuring it is free from restricted substances for safe industrial use.
