S-91830A101 4-40 x 1/4" 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
- Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and long-term reliability.
- Excellent grip and easy hand-tightening thanks to the knurled round head design, reducing tool dependency and speeding up assembly.
- High tensile strength of 80,000 psi ensures secure fastening under heavy loads and vibration, minimizing the risk of failure.
- Precise Class 2A thread fit with 4-40 UNC coarse spacing for quick, smooth engagement and consistent performance.
- Full threading along the 1/4" length provides maximum thread contact and adjustable positioning in various applications.
- Durable Rockwell B83 hardness offers excellent wear resistance, maintaining thread integrity through repeated use.
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets international standards for industrial components.
Professional Applications & Engineering Value
This 4-40 UNC Thumb Screw in 18-8 Stainless Steel is engineered to address common industrial challenges such as corrosion, frequent adjustments, and high-stress conditions. The knurled head provides a non-slip surface for secure hand-tightening, eliminating the need for tools in tight spaces or during rapid maintenance. With its coarse thread spacing and Class 2A thread fit, it ensures quick installation and reliable holding power in machinery, electronic enclosures, and assembly jigs. The fully threaded design and raised head profile enhance versatility, making it suitable for applications where accessibility and corrosion resistance are critical, such as in marine, automotive, and HVAC systems.
Specification Summary & Compliance
This thumb screw features a 4-40 UNC thread size with Class 2A thread fit for precise dimensional accuracy and easy assembly. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances. Manufactured to meet standard industrial requirements, it includes a right-hand thread direction, coarse thread spacing, and full compliance with common engineering specifications for reliable performance in professional settings.
