S-91385A157 1/4"-20 x 3/16" 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
- Permanent vibration resistance with nylon patch thread locker that maintains secure fastening in high-stress environments
- Superior corrosion protection through black-oxide coating on alloy steel, extending service life in demanding conditions
- Precise thread engagement with Class 3A UNC coarse threads ensuring reliable installation and maximum holding power
- Exceptional temperature tolerance with thread locker performing reliably from -50°F to 250°F for diverse industrial applications
- Optimized torque transmission through 1/8" hex drive design enabling secure installation in confined spaces
- Enhanced material durability with Rockwell C45 hardness providing excellent wear resistance and structural integrity
- Secure component positioning with cup tip design that digs into surfaces for positive locking without slipping
Professional Applications & Engineering Value
This black-oxide alloy steel set screw addresses critical industrial fastening challenges where vibration resistance and positional security are paramount. The permanent nylon patch thread locker eliminates the need for secondary locking mechanisms in machinery, automotive assemblies, and precision equipment. Engineered with UNC Class 3A coarse threads, it provides superior engagement in soft materials and rapid installation in production environments. The headless hex drive design allows flush mounting in confined spaces while maintaining high torque capability. Ideal for securing pulleys, gears, and collars on rotating shafts, this high-temperature resistant fastener delivers reliable performance across diverse operating conditions from manufacturing equipment to transportation systems.
Specification Summary & Compliance
Manufactured to ASME B18.3 standards with precise UNC Class 3A thread fit ensuring dimensional accuracy and interchangeability. The 1/4"-20 coarse thread configuration provides optimal thread engagement while the Rockwell C45 hardness guarantees mechanical strength. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting international safety and sustainability requirements for industrial components.
