S-91375A345 5/16"-18 x 3 1/2" 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 demanding applications
- Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in harsh environments
- High-strength performance with Rockwell C45 hardness, ensuring durability under heavy loads and repeated use
- Precise installation and removal using the 5/32" hex socket drive, allowing for high torque application in confined spaces
- Effective surface grip from the cup tip design, preventing component slippage and maintaining positional accuracy
- Reliable thread engagement with UNC coarse threads, facilitating quick assembly and reducing cross-threading risks
- Regulatory compliance assurance meeting ASME B18.3, ASTM F912, RoHS 3, and REACH standards for quality and safety
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to address critical challenges in industrial machinery, automotive assemblies, and precision equipment where vibration resistance and long-term reliability are paramount. The headless design with hex socket drive allows for flush mounting in tight spaces, while the UNC coarse threads and Class 3A thread fit ensure consistent clamping force without loosening. The cup tip concentrates pressure on a small contact area, providing superior grip on shafts and collars. Combined with Rockwell C45 hardness, it withstands heavy rotational forces and environmental stressors, making it ideal for permanent or semi-permanent fastening in high-stress applications.
Specification Summary & Compliance
This set screw features a 5/16"-18 UNC coarse thread with Class 3A precision fit for accurate engagement and minimal backlash. It complies with ASME B18.3 and ASTM F912 manufacturing specifications, ensuring dimensional consistency and mechanical performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations for hazardous substances.
