S-99477A118 10-32 x 5/8" ASME B18.3, UL 94 HB Plastic Socket Head Screws

Key Features & Benefits at a Glance

• Corrosion-resistant polypropylene construction ensures reliable performance in humid or chemical environments without rust or degradation.
• Precision Class 2A thread fit guarantees smooth assembly and secure fastening with minimal risk of cross-threading in fine-thread applications.
• 4500 psi tensile strength provides dependable holding power for light to medium-duty industrial assemblies.
• Wide temperature tolerance (-20° to 180°F) maintains structural integrity across various operational conditions.
• Hex socket drive design allows for high-torque installation with standard tools, reducing slip and tool wear.
• Full thread coverage enables uniform load distribution along the entire fastener length for enhanced joint stability.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to industry standards and environmental safety regulations.

Professional Applications & Engineering Value

Engineered for precision fastening in electrical enclosures, laboratory equipment, and food-grade machinery, this 10-32 UNF fine thread socket head cap screw addresses critical needs in non-conductive and corrosion-sensitive environments. The off-white polypropylene material eliminates galvanic corrosion risks when used with dissimilar metals, while the fine UNF thread delivers superior vibration resistance compared to coarse threads. Its 5/32" hex drive and standardized socket head profile facilitate efficient installation in confined spaces, reducing assembly time and improving maintenance accessibility. Ideal for applications requiring repeated disassembly, the screw’s plastic composition prevents damage to sensitive components, making it a versatile solution for OEM and MRO professionals.

Specification Summary & Compliance

This screw maintains Class 2A thread fit tolerances per UNF standards, with a fully threaded 5/8" length and 5/16" head diameter. Manufacturing conforms to ASME B18.3 specifications for dimensional consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are present. Temperature performance is certified for -20° to 180°F operational range.