S-90778A405 1/4"-20 x 5/16" 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 thanks to 316 stainless steel construction, ideal for harsh environments and chemical exposure
- Exceptional holding power and minimal slippage with a 90° cone point that bites securely into mating surfaces
- High-strength, precision threading via UNC Class 3A fit ensures reliable, vibration-resistant fastening in demanding applications
- Durable, long-lasting performance is guaranteed by a Rockwell B80 hardness rating, resisting wear and deformation
- Easy and secure installation with a hex drive (1/8") and headless design, allowing for flush mounting in tight spaces
- Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met
- Optimized for coarse threading applications where quick assembly and high resistance to loosening are critical
Professional Applications & Engineering Value
This 316 stainless steel hex headless set screw is engineered to solve critical fastening challenges in industrial settings. Its UNC Class 3A coarse thread and 90° cone point provide superior grip and resistance to vibrational loosening, making it ideal for securing components in machinery, automotive assemblies, and marine equipment. The headless design and 1/8" hex drive facilitate installation in confined spaces while maintaining a clean, flush finish. Manufactured from corrosion-resistant 316 stainless steel, it withstands aggressive environments, including those with high moisture or chemical exposure, ensuring long-term reliability and reducing maintenance needs in heavy-duty industrial applications.
Specification Summary & Compliance
This set screw adheres to ASME B18.3 specifications, with a 1/4"-20 UNC Class 3A thread ensuring precise dimensional accuracy and a tight fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility. The screw features a coarse thread spacing, right-hand thread direction, and a 5/16" length, designed for robust performance in standardized industrial fastening systems.
