S-90289A540 1/4"-20 x 3/4" 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 secure, vibration-resistant fastening in demanding applications
- High-strength alloy steel construction with Rockwell C45 hardness provides exceptional durability under heavy loads
- Hex headless design allows for flush installation in confined spaces while maintaining high torque capability
- UNC coarse threading enables quick assembly and disassembly while resisting loosening from vibrations
- Cup tip configuration creates positive locking contact on shaft surfaces for reliable component positioning
- Full regulatory compliance with ASME B18.3, RoHS 3, and REACH standards ensures safety and environmental responsibility
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers exceptional performance in industrial settings where corrosion resistance and vibration-proof fastening are critical. The combination of Class 3A UNC coarse threads and Rockwell C45 hardness provides superior holding power in machinery, automotive components, and power transmission systems. The hex headless design with cup tip ensures maximum contact pressure for securing gears, pulleys, and collars on shafts, preventing slippage even under high torque conditions. Engineered to meet ASME B18.3 specifications, these set screws maintain dimensional accuracy and thread integrity throughout their service life, reducing maintenance frequency and equipment downtime in industrial applications.
Specification Summary & Compliance
This 1/4"-20 UNC set screw features precise Class 3A thread fit with coarse thread spacing and right-hand thread direction. Manufactured to ASME B18.3 standards with a 3/4" length and 1/8" hex drive size. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while maintaining high performance standards.
