S-92929A129 4-40 x 9/32" ASME B18.6.3 Plastic Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Excellent corrosion resistance with durable Nylon Plastic construction, ideal for harsh environments and electrical applications
• Precise flush mounting with 100° countersink angle and standard flat head profile for seamless, professional finishes
• Superior assembly efficiency with fully threaded design and coarse UNC threads for faster installation and strong holding power
• Reliable performance across wide temperature ranges, maintaining integrity from -40°F to 185°F
• Guaranteed dimensional accuracy with Class 2A thread fit ensuring consistent, vibration-resistant connections
• Compliance with industry standards including ASME B18.6.3 and RoHS 3 for quality assurance and environmental safety
• Versatile slotted drive compatibility for easy installation with standard screwdrivers in various industrial settings

Professional Applications & Engineering Value

These 4-40 UNC flat head slotted screws provide critical solutions for precision assembly challenges where metal fasteners are unsuitable. The Nylon Plastic material offers inherent electrical insulation and chemical resistance, preventing galvanic corrosion in sensitive electronic enclosures, medical devices, and food processing equipment. The fully threaded coarse UNC design ensures maximum thread engagement in plastic and soft materials, reducing stripping risks. With a 100° countersink angle and standard flat head profile, they create flush surfaces that eliminate snagging points in aerodynamic components and consumer products. These screws maintain dimensional stability across their -40°F to 185°F operating range, making them ideal for automotive interiors, outdoor equipment, and thermal cycling environments where metal expansion would compromise joint integrity.

Specification Summary & Compliance

This 4-40 UNC flat head screw features precise Class 2A thread fit tolerances with coarse thread spacing and right-hand thread direction. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy, while material composition meets RoHS 3 (2015/863/EU) compliance for environmental safety. Critical dimensions include 0.225" head diameter, 9/32" length, and standard flat head profile with 100° countersink angle for consistent performance in industrial applications.