S-90732A310 4-40 x 1/2" Thumb Screws

Key Features & Benefits at a Glance

• Hand-tightening convenience with thumb head and external hex drive for quick installation and removal without tools in tight spaces
• Exceptional durability from black-oxide steel offering corrosion resistance and Rockwell B84 hardness for long service life
• High-load capacity with 70,000 PSI tensile strength to withstand heavy-duty industrial applications
• Reliable thread engagement through UNC coarse threading with Class 2A fit ensuring consistent fastening and vibration resistance
• Full threading versatility allowing complete engagement along the 1/2" length for adjustable positioning
• Regulatory compliance meeting RoHS 3 and REACH standards for safe use in regulated environments
• Right-hand thread standardization providing compatibility with common assembly practices and replacement parts

Professional Applications & Engineering Value

This 4-40 UNC thumb screw delivers critical performance where manual adjustments and frequent access are required. The black-oxide steel construction resists corrosion in industrial settings, while the external hex drive combined with the thumb head enables both tool-assisted and hand-tightening operations. Its coarse threading and Class 2A fit prevent cross-threading during installation, reducing assembly errors in machinery, electronics, and equipment panels. The fully threaded design ensures maximum grip length, making it ideal for applications requiring precise clamping force or repeated adjustments without compromising the 70,000 PSI tensile strength.

Specification Summary & Compliance

This thumb screw adheres to UNC thread standards with Class 2A thread fit for consistent dimensional accuracy. It meets RoHS 3 (2015/863/EU) compliance under exemption 6(a)-I and REACH (EC 1907/2006) standards, ensuring environmental and safety regulations are satisfied for industrial fastener applications.