S-91746A023 4-48 x 3/4" Thumb Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life.
• Enhanced manual grip and torque application thanks to the fully knurled round head, allowing for tool-free tightening and loosening.
• Reliable fastening in precision assemblies due to the 4-48 UNF fine thread and Class 2A fit, ensuring consistent engagement and vibration resistance.
• High mechanical strength for demanding applications, with a tensile strength of 80,000 psi and Rockwell B83 hardness to prevent stripping and deformation.
• Full-length threading for maximum adjustability and holding power, providing versatile fastening along the entire 3/4" length.
• Compliance with major environmental regulations, including RoHS 3 and REACH, ensuring safety and suitability for regulated industries.
• Right-hand thread direction for standard, intuitive installation, streamlining assembly processes and reducing errors.

Professional Applications & Engineering Value

This 4-48 UNF Thumb Screw is engineered to solve critical challenges in precision industrial and electronic applications where tool-free access and reliable fastening are paramount. The 18-8 Stainless Steel material offers excellent resistance to oxidation and corrosion, making it suitable for use in medical devices, laboratory equipment, and outdoor enclosures. The knurled round head provides a secure, non-slip grip, even with gloved hands, reducing assembly time and the risk of damage from tools. The fine UNF threading and Class 2A thread fit ensure a precise, snug fit in tapped holes, minimizing loosening under vibration—a common pain point in machinery and aerospace components. Its fully threaded design allows for adjustable clamping force, ideal for securing panels, access doors, and calibration mechanisms that require frequent adjustments without compromising holding strength.

Specification Summary & Compliance

This thumb screw adheres to UNF thread standards with a Class 2A thread fit for consistent dimensional accuracy and interchangeability. Key specifications include a 4-48 thread size, 3/4" length, and fully threaded design. The product is manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global markets requiring strict environmental and safety standards.