S-91746A844 4-40 x 1" Thumb Screws
Thumb Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Enhanced manual grip with knurled round head design for secure, tool-free operation in tight spaces
- Superior corrosion resistance from 18-8 stainless steel construction, ideal for humid or demanding environments
- High mechanical strength with 80,000 psi tensile strength and Rockwell B85 hardness for reliable, long-term performance
- Precise thread engagement with Class 2A UNC coarse threads ensuring smooth installation and vibration resistance
- Full threading versatility allowing consistent fastening along the entire 1" length for adjustable applications
- Regulatory compliance meeting RoHS 3 and REACH standards for safe use in industrial and commercial settings
- Broad compatibility with 4-40 UNC right-hand thread systems, simplifying replacements and inventory management
Professional Applications & Engineering Value
Engineered for efficiency, this 4-40 UNC thumb screw in 18-8 stainless steel addresses common assembly challenges by combining manual operability with robust performance. The knurled round head provides exceptional tactile control, reducing installation time and eliminating the need for tools in frequently adjusted components like access panels, electronic enclosures, and machinery guards. Its coarse UNC threading and Class 2A fit ensure quick alignment and secure fastening, minimizing cross-threading risks. With full threading along the 1" length, it offers flexibility in depth-sensitive applications, while the material’s inherent corrosion resistance extends service life in industrial, marine, or outdoor environments, supporting maintenance-free operation.
Specification Summary & Compliance
This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured from 18-8 stainless steel, featuring a right-hand thread direction, coarse thread spacing, and fully threaded 1" length. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for global industrial use.
