S-91746A532 4-40 x 3/4" 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 manual grip with knurled round head design for easy hand-tightening without tools
- Exceptional corrosion resistance from 18-8 stainless steel construction in harsh environments
- High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for demanding applications
- Precision thread engagement with Class 2A UNC coarse threads ensuring reliable fastening
- Optimized partial threading providing secure clamping while reducing material usage
- Regulatory compliance meeting RoHS 3 and REACH standards for global industrial use
- Right-hand thread configuration for standard installation and familiar operation
Professional Applications & Engineering Value
This 4-40 UNC thumb screw delivers exceptional performance in industrial settings where frequent adjustments and reliable fastening are critical. The 18-8 stainless steel construction provides excellent corrosion resistance, making it ideal for electronics enclosures, machinery guards, and laboratory equipment exposed to moisture or chemicals. The knurled round head offers superior tactile grip, enabling quick manual operation without specialized tools - particularly valuable in maintenance applications requiring repeated access. The coarse UNC threading and Class 2A thread fit ensure consistent engagement and vibration resistance, while the partial threading design provides optimal clamping force distribution. These thumb screws solve common assembly challenges by combining tool-free operation with industrial-grade durability.
Specification Summary & Compliance
This thumb screw features precision 4-40 UNC coarse threads with Class 2A thread fit for consistent engagement and reliable performance. The manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental compliance for global industrial applications. Critical dimensions include 3/4" length with 5/8" thread length, 0.25" head diameter, and standardized right-hand threading. The 18-8 stainless steel material maintains mechanical integrity with 80,000 psi tensile strength and Rockwell B85 hardness specification.
