S-92991A106 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 from durable brass construction, ideal for humid or corrosive industrial environments
- Exceptional thread engagement with Class 3A thread fit ensuring vibration-resistant, secure fastening in precision assemblies
- Optimized torque transmission through 0.050" hex drive design preventing tool slippage and damage during installation
- Enhanced material durability with Rockwell B55 hardness providing reliable mechanical strength for repeated adjustments
- Secure component positioning via cup tip design that creates positive locking action on shafts and rotating parts
- Simplified installation access using headless right-hand UNC coarse threads for straightforward assembly in confined spaces
- Regulatory compliance assurance meeting ASME B18.3 standards while being RoHS 3 and REACH compliant for global applications
Professional Applications & Engineering Value
This 4-40 UNC brass set screw delivers critical engineering solutions where corrosion resistance and precision alignment are paramount. The headless design with cup tip enables flush mounting while generating concentrated surface pressure for secure shaft positioning in pulleys, gears, and collars. Manufactured from brass with Rockwell B55 hardness, it withstands repeated adjustments without galling or seizing in temperature-sensitive assemblies. The Class 3A thread fit and coarse UNC threads provide exceptional vibration resistance in industrial equipment, electronic enclosures, and precision instruments. The 0.050" hex drive ensures reliable torque transmission during installation in confined spaces, making it ideal for maintenance-critical applications across manufacturing, marine, and electrical industries where RoHS and REACH compliance is mandatory.
Specification Summary & Compliance
This precision set screw maintains Class 3A thread fit tolerances per UNC standards with 4-40 thread size and coarse thread spacing. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance. The component is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental regulations for industrial use.
