S-93445A180 4-40 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 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional thread precision with UNC Class 3A fit ensuring reliable, vibration-resistant fastening
- Enhanced locking capability through serrations that prevent loosening under dynamic loads
- Optimized torque transmission with 0.050" hex drive for secure installation without stripping
- Consistent mechanical performance maintained by Rockwell B80 hardness for repeated use
- Secure component positioning achieved through cup tip design for concentrated contact pressure
- Broad regulatory compliance meeting ASME B18.3 standards plus RoHS 3 and REACH environmental directives
Professional Applications & Engineering Value
This 4-40 UNC Class 3A set screw delivers critical engineering solutions for precision assemblies requiring reliable positioning and locking. The 18-8 stainless steel composition provides excellent corrosion resistance for manufacturing equipment, automotive components, and electronic enclosures exposed to moisture or chemicals. The coarse UNC threads enable rapid installation while maintaining Class 3A thread fit tolerances for vibration-resistant performance in dynamic applications. The combination of hex drive configuration and serrations creates a dual-locking mechanism that prevents rotational slippage in high-torque scenarios. The headless design with cup tip ensures flush mounting while concentrating clamping force for secure shaft and collar applications.
Specification Summary & Compliance
This precision fastener maintains UNC Class 3A thread fit with 4-40 thread size and 1/4" length dimensions. Manufacturing conforms to ASME B18.3 specifications for dimensional accuracy and performance reliability. The component is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial use. Thread configuration follows right-hand direction with coarse spacing, while material hardness is certified to Rockwell B80 standards.
