S-91746A920 4-48 x 1/2" 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
- Superior grip and tool-free operation with knurled head design for easy hand tightening and adjustment in confined spaces
- Excellent corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
- High mechanical strength with 80,000 psi tensile strength and Rockwell B83 hardness for reliable, durable fastening
- Precision thread engagement with Class 2A fit and UNF fine threads ensuring secure, vibration-resistant connections
- Maximum fastening surface contact through fully threaded design for superior load distribution
- Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe use in regulated industries
- Versatile narrow profile design with round head shape for applications where space is limited
Professional Applications & Engineering Value
This 4-48 UNF fine thread thumb screw delivers exceptional performance in industrial settings where frequent adjustments and tool-free access are critical. The 18-8 stainless steel construction provides superior corrosion resistance, making it ideal for electronics enclosures, machinery panels, and laboratory equipment exposed to moisture or chemicals. The knurled head texture ensures positive grip even with gloved hands, while the narrow profile round head design fits seamlessly in tight spaces. With its Class 2A thread fit and fine threading, this thumb screw maintains precise alignment and prevents loosening under vibration, solving common maintenance and accessibility challenges in industrial assembly applications.
Specification Summary & Compliance
This thumb screw features precision 4-48 UNF fine threads with Class 2A fit for consistent engagement and reliable performance. The manufacturing adheres to strict dimensional tolerances with a 1/2" length and 0.25" head diameter. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and material transparency for global industrial applications.
