S-91746A628 4-40 x 3/8" Thumb Screws
Thumb Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
- Excellent hand-tightening capability thanks to the knurled head texture providing secure, non-slip grip
- Space-saving low-profile design with round head shape ideal for applications with limited clearance
- Reliable thread engagement through fully threaded UNC coarse spacing for quick assembly and strong holding power
- Consistent performance ensured by Class 2A thread fit and 80,000 psi tensile strength for demanding applications
- Enhanced durability with Rockwell B85 hardness maintaining structural integrity under repeated use
- Compliance with environmental regulations including RoHS 3 and REACH for global market acceptance
Professional Applications & Engineering Value
Engineered for precision and reliability, this 4-40 UNC thumb screw delivers exceptional value in industrial settings where frequent adjustments and secure fastening are critical. The 18-8 stainless steel material provides excellent corrosion resistance, making it ideal for electronics enclosures, machinery panels, and laboratory equipment exposed to moisture or chemicals. The knurled head texture and low-profile round design enable quick hand-tightening without tools, significantly reducing assembly time in production lines and maintenance operations. With its fully threaded coarse spacing and Class 2A thread fit, this thumb screw ensures consistent engagement and vibration resistance, solving common issues of loosening in dynamic environments while maintaining the structural integrity required for professional applications.
Specification Summary & Compliance
This thumb screw features precision 4-40 UNC threads with Class 2A thread fit for reliable dimensional accuracy and compatibility with standard components. The manufacturing adheres to strict quality standards, ensuring consistent 5/16" head diameter and 3/8" length specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting international environmental and safety requirements for industrial use.
