S-95289A140 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 from 18-8 Stainless Steel construction, ensuring long-term reliability in harsh environments
- Precise component positioning with Class 3A thread fit for tighter tolerances and reduced backlash in critical assemblies
- Enhanced torque transmission through the 1/8" hex drive, preventing tool slippage during installation
- Secure fastening engagement with extended tip design that increases contact surface area for improved holding power
- Consistent performance maintained through Rockwell B80 hardness, providing optimal strength without brittleness
- Reliable fine thread spacing (UNF 1/4"-28) offering better vibration resistance compared to coarse threads
- Full regulatory compliance with ASME B18.3 standards and environmental regulations (RoHS 3, REACH) for global applications
Professional Applications & Engineering Value
This high-precision set screw addresses critical engineering challenges in industrial machinery, automation systems, and precision equipment where vibration resistance and positioning accuracy are paramount. The 18-8 Stainless Steel material provides excellent corrosion resistance for applications exposed to moisture, chemicals, or outdoor elements, while the extended tip design ensures maximum contact with the mating surface, preventing component slippage under dynamic loads. The Class 3A thread fit and UNF fine threading work synergistically to maintain precise alignment in high-vibration environments, making these hex headless set screws ideal for permanent installations where space constraints and reliability are critical factors in manufacturing and maintenance operations.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread fit precision and UNF 1/4"-28 fine thread spacing. The inch measurement system ensures compatibility with North American machinery standards. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, with material hardness maintained at Rockwell B80 for consistent mechanical performance. Tip dimensions include 0.134" length and 0.156" diameter with tight manufacturing tolerances for reliable installation and operation.
