S-93140A839 1/4"-20 x 3/4" ASME B18.6.3 Plastic Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional transparency and chemical resistance from clear polycarbonate material, ideal for applications requiring visual inspection or exposure to harsh environments
• Reliable thread engagement and vibration resistance with UNC coarse threading and Class 2A fit, ensuring secure fastening in various materials
• Wide temperature tolerance from -40°F to 210°F, maintaining performance in both extreme cold and moderate heat conditions
• Flush mounting capability with standard 82° countersink angle and flat head design for smooth, unobtrusive surface finishes
• Easy manual installation and removal using standard slotted drive tools, providing simple maintenance access
• Full regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
• Complete thread coverage along the entire 3/4" length for maximum holding power and load distribution

Professional Applications & Engineering Value

These clear polycarbonate flat head screws provide essential solutions for industries requiring corrosion-resistant, transparent fastening where metal components would compromise performance. The polycarbonate plastic construction eliminates galvanic corrosion concerns in electrical and marine applications while allowing visual verification of proper installation. With UNC coarse threads and Class 2A thread fit, these screws deliver reliable performance in plastics, wood, and soft metals without stripping threads. The 82° countersink angle ensures flush mounting in standard chamfered holes, creating seamless assemblies in display equipment, optical devices, and food processing machinery where hygiene and visibility are critical. The full threading maximizes pull-out strength while the temperature resistance maintains dimensional stability across diverse operating environments.

Specification Summary & Compliance

This 1/4"-20 UNC coarse thread screw features Class 2A thread fit tolerances per ASME B18.6.3 specifications, ensuring precise dimensional accuracy and interchangeability. The fully threaded design provides consistent engagement while the standard 82° flat head profile matches common countersunk hole preparations. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming absence of restricted substances. The right-hand thread direction and slotted drive style follow industry-standard configurations for broad compatibility with existing assembly processes and tooling.