S-90289A618 3/8"-16 x 7/16" 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
- Exceptional vibration resistance through precision serrations that maintain secure positioning under dynamic loads
- Superior corrosion protection with black-oxide coating extending service life in demanding industrial environments
- Maximum thread engagement reliability with Class 3A fit ensuring precise assembly and reduced loosening risks
- Enhanced installation torque capacity from Rockwell C45 hardened alloy steel construction
- Optimized point contact pressure via cup tip design for superior component gripping
- Streamlined maintenance access with 3/16" hex drive in headless configuration for space-constrained applications
- Industry-standard compatibility with UNC coarse threads facilitating straightforward replacement and inventory management
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical vibration resistance in high-stress assemblies through its precision serrations and cup tip design. The Rockwell C45 hardness ensures dimensional stability under repeated torque cycles, while the Class 3A thread fit maintains precise alignment in pulleys, gears, and coupling systems. The headless configuration with hex drive enables flush mounting in confined spaces common in machinery manufacturing, automotive components, and power transmission equipment. Engineered to prevent accidental disengagement in rotating assemblies, this UNC threaded fastener provides reliable locking performance where conventional fasteners fail.
Specification Summary & Compliance
Manufactured to ASME B18.3 dimensional standards with Class 3A thread tolerances for precision fit. Features 3/8"-16 UNC coarse threads with right-hand orientation and 7/16" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The black-oxide surface treatment on alloy steel substrate provides consistent corrosion protection while maintaining Rockwell C45 hardness specifications.
