S-94555A108 4-40 x 3/8" Ceramic Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional thermal resistance - withstands continuous exposure to temperatures up to 3000°F without degradation
• Superior corrosion resistance - alumina ceramic construction eliminates rust and chemical deterioration in harsh environments
• Reliable mechanical performance - Class 2A thread fit ensures consistent engagement and secure fastening
• Optimized installation efficiency - external hex drive design provides excellent torque transmission and tool accessibility
• Enhanced durability in extreme conditions - fully threaded coarse UNC pattern maintains holding power under vibration and stress
• Environmental compliance assurance - meets RoHS 3 and REACH standards for restricted substance control
• Precision dimensional stability - maintains thread integrity and mechanical properties across thermal cycling

Professional Applications & Engineering Value

This alumina ceramic hex head screw delivers critical performance in applications where metallic fasteners fail. The high-purity alumina ceramic material provides exceptional electrical insulation and thermal stability, making it ideal for high-temperature furnace assemblies, semiconductor processing equipment, and aerospace components. The 4-40 UNC coarse thread with Class 2A fit ensures reliable installation in brittle materials while the external hex drive enables secure tool engagement without slippage. Unlike metal alternatives, this ceramic fastener maintains dimensional stability at extreme temperatures, preventing galling and seizure in thermal cycling applications. The fully threaded design maximizes load distribution, while the off-white alumina ceramic offers excellent wear resistance in abrasive environments.

Specification Summary & Compliance

This 4-40 UNC hex head screw features precision Class 2A thread fit with coarse thread spacing, manufactured to exacting dimensional standards. The 3/8" length and external hex drive configuration ensure consistent performance across applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental standards for industrial components. Manufactured from high-grade alumina ceramic, this fastener maintains its mechanical properties and dimensional accuracy throughout its operational temperature range up to 3000°F.