S-91746A112 4-40 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 manual grip with knurled round head design for quick, tool-free installation and removal without slipping
- Superior corrosion resistance from 18-8 stainless steel construction, ideal for humid or chemically exposed environments
- High mechanical reliability with 80,000 psi tensile strength and Rockwell B85 hardness for durable, long-lasting assemblies
- Precision thread engagement with Class 2A fit and UNC coarse threads ensuring consistent, vibration-resistant connections
- Optimized thread length with partial threading allowing secure fastening while minimizing unnecessary thread contact
- Broad regulatory compliance meeting RoHS 3 and REACH standards for safe use in global industrial markets
- Right-hand coarse threading providing rapid installation in standard UNC applications with common tooling
Professional Applications & Engineering Value
Engineered for industrial equipment, electronic enclosures, and machinery panels, this 4-40 UNC thumb screw delivers exceptional value in applications requiring frequent access or adjustments. The 18-8 stainless steel material resists oxidation and chemical degradation, extending service life in demanding conditions. Its knurled head texture ensures positive grip even with gloved hands, reducing installation time and eliminating specialized tools. The partially threaded design concentrates clamping force precisely where needed, preventing cross-threading while maintaining Class 2A thread fit accuracy. This combination addresses critical assembly challenges—combining corrosion protection, mechanical strength, and user-friendly operation for maintenance-heavy environments.
Specification Summary & Compliance
This thumb screw maintains Class 2A thread fit tolerance with 4-40 UNC coarse threads (0.112" diameter) and 7/16" thread length. Manufacturing conforms to standardized inch system measurements with right-hand threading orientation. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and unrestricted use in industrial sectors worldwide.
