S-90669A351 1/4"-28 x 1/4" ASME B18.3 Set Screws
Set 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
- Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments.
- Exceptional holding power and precision fit due to the Class 3A thread fit and fine UNF thread spacing.
- Protects sensitive surfaces from damage with its integrated soft brass tip, preventing marring and gouging.
- High mechanical strength and durability ensured by a Rockwell B80 hardness rating for long-term reliability.
- Secure and reliable installation with a 1/8" hex drive, providing excellent torque transmission in confined spaces.
- Guaranteed dimensional consistency and performance, manufactured to meet ASME B18.3 specifications.
- Safe for use in regulated industries as it is compliant with RoHS 3 and REACH environmental regulations.
Professional Applications & Engineering Value
This 1/4"-28 UNF Class 3A set screw is engineered to solve critical challenges in precision assembly and motion control systems. The 18-8 Stainless Steel material provides excellent resistance to rust and corrosion, making it suitable for applications in manufacturing, automotive, and electronics where environmental factors are a concern. The fine thread spacing and Class 3A fit ensure a tight, secure connection that resists loosening under vibration, crucial for maintaining alignment in machinery and pulleys. The integrated brass soft tip is a key feature for applications involving shafts or delicate components, as it applies clamping force without damaging the contact surface. This combination of a headless design and right-hand thread allows for flush mounting and easy adjustment in space-constrained assemblies, delivering reliable performance and reducing maintenance needs.
Specification Summary & Compliance
This set screw features a 1/4"-28 UNF thread with a Class 3A thread fit for high precision and a fine thread spacing. It is manufactured in compliance with the ASME B18.3 standard, ensuring consistent dimensional accuracy and mechanical performance. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial components.
