S-93140A708 4-40 x 3/8" ASME B18.6.3 Plastic Slotted Flat Head Screws
Plastic Slotted Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- High transparency and chemical resistance from clear polycarbonate material, ideal for applications requiring visibility and durability in harsh environments.
- Precise Class 2A thread fit ensures reliable engagement and consistent performance in assembly, reducing the risk of cross-threading.
- Wide temperature tolerance from -40° to 210° F allows stable operation in varying thermal conditions without degradation.
- Standard 82° countersink angle and flat head design provides a flush finish for smooth surfaces and enhanced aesthetic appeal.
- Fully threaded right-hand UNC coarse thread offers quick installation and strong holding power in plastic and soft materials.
- Compliance with ASME B18.6.3, RoHS 3, and REACH standards ensures safety, environmental responsibility, and interoperability in regulated industries.
- Slotted drive style enables easy manual installation with common tools, reducing assembly time and complexity.
Professional Applications & Engineering Value
These 4-40 UNC flat head slotted screws are engineered to address common industrial challenges, such as the need for corrosion-resistant and non-conductive fasteners in electrical enclosures, medical devices, and optical assemblies. Made from durable polycarbonate plastic, they prevent galvanic corrosion when used with dissimilar metals and maintain clarity for inspection purposes. The fully threaded coarse thread design ensures secure fastening in plastic components, reducing stripping and improving load distribution. With a temperature range of -40° to 210° F, these screws perform reliably in both cold storage and heated environments, making them suitable for precision applications in automotive, electronics, and consumer goods where material integrity and regulatory compliance are critical.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit tolerances and UNC coarse threading standards for consistent dimensional accuracy. It meets ASME B18.6.3 specifications for slotted flat head screws and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for various industrial uses.
