S-91375A875 1/4"-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
- Superior vibration resistance and permanent positioning with the cup point tip design that bites into mating surfaces
- Exceptional durability and corrosion resistance provided by the zinc plating on high-strength alloy steel
- Maximum assembly efficiency with the coarse UNC thread and Class 3A fit for quick, reliable installation
- High torque capability and strip-resistance from the Rockwell C45 hardness and 1/8" hex drive
- Flush, space-saving installation enabled by the headless design for compact assemblies
- Guanteed mechanical reliability through compliance with the stringent ASME B18.3 manufacturing standard
- Safe for regulated industries with full RoHS 3 and REACH environmental compliance
Professional Applications & Engineering Value
This 1/4"-20 UNC set screw is engineered to solve critical challenges in power transmission and motion control systems. The zinc plated alloy steel construction provides excellent corrosion protection for harsh industrial environments, while the Rockwell C45 hardness ensures the cup point maintains its bite under extreme vibrational loads. The Class 3A thread fit and coarse thread spacing enable rapid assembly with minimal cross-threading risk, making it ideal for high-volume production lines. Its headless hex drive design allows for flush mounting in pulleys, gears, and collars where protruding fastener heads are unacceptable. This combination of features delivers reliable, permanent shaft positioning in automotive, machinery, and aerospace applications where component slippage can cause catastrophic failure.
Specification Summary & Compliance
This set screw maintains Class 3A thread tolerances per Unified National Coarse (UNC) standards with 1/4"-20 thread size and right-hand direction. Manufacturing conforms to ASME B18.3 specifications (ASTM F912) ensuring dimensional precision and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications with strict material restrictions.
