S-90289A759 1/2"-20 x 1 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 demanding industrial environments
- Precise Class 3A thread fit ensures tight, secure fastening with minimal vibration loosening
- High-strength Rockwell C45 hardness provides excellent durability under heavy loads and repeated adjustments
- Secure hex drive design allows for high-torque installation without head protrusion in space-constrained applications
- Cup point tip creates deep biting action for maximum grip and resistance to rotational forces
- Fine UNF thread profile delivers superior clamping force distribution and vibration resistance
- Full regulatory compliance meets ASME B18.3 specifications and environmental standards for global industrial use
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers exceptional performance in precision assembly applications where space optimization and vibration resistance are critical. The headless design with 1/4" hex drive enables flush mounting in confined spaces while maintaining high torque capability. The cup point tip bites deeply into shaft materials, preventing slippage in high-torque transmission systems, pulleys, and gear assemblies. With Class 3A UNF fine threads, this fastener provides superior clamping force distribution, making it ideal for precision machinery, automotive components, and industrial equipment where vibration-induced loosening would compromise system integrity. The combination of Rockwell C45 hardness and corrosion-resistant black-oxide finish ensures long-term reliability in harsh operating conditions.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision applications. Features 1/2"-20 UNF fine threads with right-hand direction and 1 1/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification confirms Rockwell C45 hardness for consistent performance across industrial applications.
