S-94320A331 4-40 x 1/4" Thumb Screws

Key Features & Benefits at a Glance

• Excellent manual operation with knurled round head providing superior grip without tools
• Corrosion-resistant performance in various environments thanks to durable nylon plastic construction
• Reliable fastening strength with 11,000 psi tensile capacity for secure assemblies
• Wide temperature compatibility from -40° to 185°F for diverse industrial applications
• Precision thread engagement with Class 2A UNC coarse threads ensuring consistent fit
• Environmental compliance meeting RoHS 3 standards for regulated industries
• Full threading design providing maximum engagement along the entire 1/4" length

Professional Applications & Engineering Value

This nylon plastic thumb screw delivers exceptional value in applications requiring frequent adjustments or electrical insulation. The high-profile round head with deep knurling enables quick hand-tightening in confined spaces, while the 4-40 UNC coarse threading with Class 2A fit ensures reliable engagement in plastic and soft material assemblies. Engineers specify this fully threaded screw for electronic enclosures, laboratory equipment, and consumer products where corrosion resistance and electrical isolation are critical. The material's natural lubricity prevents galling and the 11,000 psi tensile strength provides dependable clamping force without damaging sensitive components.

Specification Summary & Compliance

This thumb screw features precision 4-40 UNC coarse threads with Class 2A thread fit per ASME B1.1 standards, ensuring consistent engagement and reliable performance. The 1/4" length with full threading provides maximum utility in various assembly scenarios. Manufacturing complies with RoHS 3 (2015/863/EU) environmental regulations, making it suitable for electronics and consumer products requiring hazardous substance restrictions. The 21/64" head diameter and 7/32" head height with knurled texture deliver optimal manual operation characteristics.