S-91746A020 4-48 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
- Superior grip and tool-free operation with a knurled round head design for easy manual tightening and loosening in tight spaces
- Excellent corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh or humid industrial environments
- High tensile strength of 80,000 PSI ensures reliable, durable fastening under significant mechanical stress
- Precision Class 2A thread fit provides smooth engagement and consistent performance in fine-thread applications
- Full threading along the 1/2" length allows for maximum adjustability and secure holding power
- Compliance with RoHS 3 and REACH standards guarantees environmental safety and regulatory acceptance in global markets
- Rockwell B83 hardness offers excellent wear resistance and long-term durability in repetitive use scenarios
Professional Applications & Engineering Value
This 4-48 UNF thumb screw is engineered to solve common assembly challenges where frequent adjustments or tool-free access is required. The 18-8 stainless steel material provides inherent corrosion resistance, making it suitable for electronics enclosures, medical devices, and outdoor equipment that face moisture or chemical exposure. The knurled head ensures a secure grip even with gloved hands, reducing installation time and improving operator efficiency. With its fine UNF threads and Class 2A fit, it delivers precise, vibration-resistant fastening in applications like precision instruments, aerospace components, and industrial machinery where reliability is critical. The fully threaded design allows for consistent clamping force across the entire length, enhancing joint integrity in dynamic load conditions.
Specification Summary & Compliance
This thumb screw features a 4-48 UNF thread with Class 2A tolerance for accurate thread engagement, a head diameter of 0.25", and a length of 1/2". It is manufactured from 18-8 stainless steel with a tensile strength of 80,000 PSI and Rockwell B83 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.
