S-91375A344 5/16"-18 x 3" ASME B18.3, ASTM F912 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 holding power with Class 3A thread fit for secure, vibration-resistant fastening in high-stress environments
- Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in harsh conditions
- Enhanced durability from Rockwell C45 hardness, resisting wear and deformation under heavy loads
- Precise installation control with the 5/32" hex drive, allowing for accurate torque application in confined spaces
- Reliable engagement due to the coarse UNC thread and cup tip design, ensuring strong grip on shafts and components
- Industry compliance meeting ASME B18.3 specifications for consistent quality and performance
- Headless design enabling flush mounting to prevent interference in compact assemblies
Professional Applications & Engineering Value
This 5/16"-18 UNC set screw is engineered to address critical challenges in industrial machinery, automotive systems, and precision equipment where component slippage can lead to operational failures. The black-oxide alloy steel construction combined with Rockwell C45 hardness provides exceptional resistance to corrosion and mechanical stress, making it ideal for environments exposed to moisture, chemicals, or constant vibration. The Class 3A thread fit and coarse UNC threads ensure rapid installation and reliable holding power, while the headless design with hex drive facilitates easy access in tight spaces. These features make it particularly valuable for securing collars, gears, and pulleys where precision alignment and long-term reliability are paramount.
Specification Summary & Compliance
This set screw maintains Class 3A thread fit tolerances per UNC standards, ensuring precise engagement and consistent performance. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial applications without hazardous substances.
