S-92952A130 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced manual operation with knurled round head and 5/64" hex drive for secure, tool-free tightening in confined spaces.
• Superior corrosion resistance due to 18-8 stainless steel construction, ideal for harsh industrial environments.
• High mechanical strength with 70,000 psi tensile strength and Rockwell B83 hardness for reliable, long-lasting performance.
• Precise alignment and spacing enabled by the precisely fitted shoulder (1/8" diameter, 1/4" length) to prevent component misalignment.
• Wide compatibility with 4-40 UNC coarse threads and Class 2A fit, ensuring easy integration into standard assemblies.
• Regulatory compliance with RoHS 3 and REACH, making it safe for use in regulated industries and global markets.
• Durable, raised round head profile provides comfortable thumb pressure and resists wear from frequent adjustments.

Professional Applications & Engineering Value

This 4-40 UNC thumb screw is engineered to address common challenges in assembly and maintenance, where quick access and reliable fastening are critical. The 18-8 stainless steel material offers excellent resistance to rust and corrosion, making it suitable for applications in electronics, machinery, and outdoor equipment. The knurled head and hex drive combine for a non-slip grip, allowing operators to tighten or loosen the screw efficiently without specialized tools, even in oily or high-vibration environments. The precise shoulder fit ensures components are accurately positioned, reducing wear and misalignment in pivoting or rotating mechanisms. With a coarse thread and right-hand direction, it provides fast installation and robust holding power, ideal for panels, clamps, and adjustable fixtures in industrial settings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent, reliable engagement. The shoulder features a diameter of 1/8" (tolerance: -0.001" to 0") and length of 1/4" (tolerance: 0" to 0.002"), ensuring precise assembly. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, guaranteeing it is free from hazardous substances and suitable for environmentally conscious industries.