S-91221A124 5/16"-18 x 1/2" 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 glass-filled nylon construction, ideal for harsh chemical or moisture-rich environments
- High tensile strength of 17,000 psi provides reliable holding power for demanding industrial applications
- Broad temperature tolerance (-40° to 200°F) ensures consistent performance in extreme thermal conditions
- Lightweight and non-conductive properties prevent galvanic corrosion and electrical interference
- Precision Class 2A thread fit guarantees smooth installation and secure fastening with standard UNC coarse threads
- Standard hex drive compatibility allows for easy installation with common 1/4" drive tools
- Regulatory compliance meets ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These glass-filled nylon socket head cap screws deliver critical advantages in applications where metal fasteners fail. The off-white nylon plastic material eliminates rust and galvanic corrosion in chemical processing, food equipment, and marine applications. With 5/16"-18 UNC coarse threads and Class 2A fit, they provide rapid assembly in plastic components and soft materials while maintaining 17,000 psi tensile strength. The socket head design with 1/4" hex drive offers secure tool engagement in confined spaces. Ideal for electrical enclosures, machinery guards, and thermal management systems where temperature resistance from -40° to 200°F ensures long-term reliability without degradation.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 2A thread fit and UNC coarse thread profile. These screws maintain dimensional accuracy with 5/16"-18 thread size and 1/2" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The glass-filled nylon material meets UL 94 HB flammability standards, ensuring safety in industrial applications.
