S-95488A127 4-40 x 3/8" Thumb Screws

Key Features & Benefits at a Glance

• Enhanced grip and easy manual operation with knurled round head design, eliminating the need for tools in frequent adjustments
• Superior corrosion resistance and electrical conductivity due to high-quality brass construction, ideal for electronics and marine environments
• Reliable thread engagement and consistent fastening with 4-40 UNC coarse threading and Class 2A fit, reducing cross-threading risks
• Optimized for tight spaces thanks to the low-profile head design, providing secure fastening where clearance is limited
• High mechanical durability with 50,000 psi tensile strength and Rockwell B78 hardness, ensuring long-term performance under stress
• Full-length threading for maximum adjustability across the entire 3/8" length, offering versatile positioning in assemblies
• Environmentally compliant and safe meeting RoHS 3 standards, supporting sustainable manufacturing practices

Professional Applications & Engineering Value

This 4-40 UNC brass thumb screw is engineered to address common industrial challenges such as tool-free maintenance and corrosion in sensitive equipment. The knurled head provides exceptional manual grip, speeding up assembly in electronics, instrumentation, and prototyping where frequent access is required. Made from durable brass, it resists oxidation and galvanic corrosion, making it suitable for electrical enclosures, marine hardware, and laboratory devices. The coarse UNC threads and Class 2A fit ensure quick, secure installation without stripping, while the low-profile round head minimizes protrusion in compact designs. With full threading along the 3/8" length, it offers precise adjustment, enhancing efficiency in OEM and MRO applications.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured to meet RoHS 3 (2015/863/EU) compliance under exemption 6(c) for lead in copper alloys, ensuring environmental safety. Key specifications include a 4-40 thread size, right-hand thread direction, and fully threaded 3/8" length, supporting reliable performance in regulated industries.