S-90289A574 5/16"-18 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 black-oxide coating, extending service life in harsh industrial environments
- Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash in critical assemblies
- High-strength alloy steel construction with Rockwell C45 hardness provides excellent wear resistance and durability
- Hex drive design allows for high-torque installation using standard tools without head protrusion
- Cup tip configuration creates positive locking contact on shafts and components without damaging surfaces
- Coarse UNC threading enables quick installation and removal while maintaining strong holding power
- Comprehensive compliance with ASME B18.3 and environmental standards ensures reliability and regulatory acceptance
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers exceptional performance in demanding industrial applications where vibration resistance and corrosion protection are critical. The Class 3A thread fit provides precise engagement for secure positioning of gears, pulleys, and collars on shafts, preventing slippage under heavy loads. The headless design with hex drive allows for flush mounting in confined spaces while accommodating high installation torque. The cup tip creates concentrated pressure points that securely lock components without causing surface damage, making it ideal for precision machinery, automotive assemblies, and power transmission systems where reliable set screw performance is essential for operational safety and reduced maintenance intervals.
Specification Summary & Compliance
Manufactured to exact ASME B18.3 specifications with 5/16"-18 UNC coarse threads and Class 3A thread fit for precision tolerance. Features Rockwell C45 hardness for optimal strength and black-oxide surface treatment for enhanced corrosion protection. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
