S-99477A109 4-40 x 3/4" ASME B18.3, UL 94 HB Plastic Socket Head Screws
Plastic Socket 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
- Exceptional corrosion resistance with polypropylene construction, ideal for chemical and moisture-rich environments without rust concerns
- Reliable 4500 psi tensile strength provides secure fastening for medium-duty industrial applications
- Wide temperature tolerance (-20° to 180°F) ensures consistent performance across varying operational conditions
- Precision Class 2A thread fit guarantees smooth installation and secure mating with UNC threaded components
- Hex socket drive design enables high-torque application and prevents stripping in confined spaces
- Full regulatory compliance including RoHS 3 and REACH eliminates supply chain restrictions for global projects
- Lightweight plastic construction reduces component weight while maintaining structural integrity
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these polypropylene socket head cap screws solve critical challenges in corrosive environments where metal fasteners would degrade. The 4-40 UNC coarse thread configuration ensures rapid installation and reliable holding power in plastic assemblies, electronic enclosures, and chemical processing equipment. With 4500 psi tensile strength and temperature stability from -20° to 180°F, these fasteners maintain integrity in thermal cycling applications while the hex socket drive provides superior torque transmission compared to slotted designs. The off-white color offers aesthetic consistency for consumer products and medical devices where appearance matters alongside functionality.
Specification Summary & Compliance
This 3/4" length socket head cap screw features precision Class 2A thread fit with 4-40 UNC coarse threading and right-hand direction. Manufactured to ASME B18.3 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations. The polypropylene material meets UL 94 HB flammability standards, ensuring suitability for various industrial applications while maintaining dimensional stability across the specified temperature range.
