S-90669A106 4-40 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.
- Precise, vibration-resistant fastening thanks to Class 3A thread fit and UNC coarse thread spacing for reliable assemblies.
- Secure, flush installation with a headless hex drive design, preventing protrusion in tight spaces.
- Surface protection for delicate components via the soft brass tip, minimizing damage during clamping.
- Consistent mechanical performance ensured by Rockwell B80 hardness, providing dependable strength.
- Easy installation and removal with a standard 0.050" hex drive, compatible with common tools.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH for global quality assurance.
Professional Applications & Engineering Value
This 4-40 UNC set screw is engineered to address critical challenges in precision assemblies where space is limited and component protection is paramount. Made from 18-8 Stainless Steel, it offers excellent resistance to rust and corrosion, making it suitable for applications in machinery, electronics, and automotive systems exposed to moisture or chemicals. The headless design with a hex drive allows for flush mounting, eliminating interference in compact designs, while the Class 3A thread fit ensures tight tolerances that resist loosening under vibration. The integrated brass soft tip provides a secure grip without marring surfaces, ideal for securing shafts, collars, and other delicate parts. By combining durability with precision, this set screw enhances assembly reliability and reduces maintenance needs in demanding industrial settings.
Specification Summary & Compliance
This set screw adheres to Class 3A thread fit for high precision in UNC coarse thread applications, with a thread size of 4-40 and length of 1/4". It conforms to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and quality in industrial use.
