S-91385A753 1/2"-20 x 1" 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 from -50°F to 250°F
- Superior corrosion protection through black-oxide coating on alloy steel for extended service life in harsh environments
- Precise thread engagement with Class 3A UNF fine threads ensuring tight tolerances and reliable positioning
- Maximum torque transmission via 1/4" hex drive in headless design for flush mounting and high clamping force
- Enhanced material strength with Rockwell C45 hardness providing excellent durability under heavy loads
- Positive locking action from cup point design that bites into mating surfaces for permanent component alignment
- Broad industrial compatibility meeting ASME B18.3 and ASTM F912 specifications for quality assurance
Professional Applications & Engineering Value
This black-oxide alloy steel set screw addresses critical vibration-induced loosening in precision machinery and power transmission systems. The UNF fine thread configuration with Class 3A fit provides exceptional dimensional accuracy for applications requiring minimal backlash in gears, pulleys, and coupling assemblies. The nylon patch thread locker creates a permanent chemical bond that eliminates the need for secondary locking mechanisms, while the cup point design generates superior biting action into shaft materials. Engineered for industrial set screw applications where temperature fluctuations from -50°F to 250°F would compromise conventional fasteners, this solution maintains clamping force in demanding environments including automotive, aerospace, and heavy equipment manufacturing.
Specification Summary & Compliance
Manufactured to ASME B18.3 and ASTM F912 standards with Class 3A thread fit precision for UNF fine threads. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features 1/2"-20 thread size, 1" length, and 1/4" hex drive configuration with cup point tip style and Rockwell C45 hardness rating.
