S-91375A109 4-40 x 7/16" 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
- Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding environments
- Exceptional thread engagement with Class 3A fit for precise, vibration-resistant fastening in critical assemblies
- High torque transmission through 0.050" hex drive, preventing tool slippage during installation
- Enhanced material strength with Rockwell C45 hardness, maintaining dimensional stability under heavy loads
- Optimized tip design with cup shape for concentrated contact pressure and superior component retention
- Reliable coarse threading (UNC) for quick installation and reduced cross-threading risks in industrial applications
- Space-saving headless profile enabling flush mounting where clearance is limited
Professional Applications & Engineering Value
Engineered for precision locking applications, this 4-40 UNC set screw delivers exceptional performance in machinery, automotive, and aerospace components where vibration resistance is critical. The black-oxide alloy steel construction provides superior corrosion protection while maintaining Rockwell C45 hardness for lasting dimensional integrity. The cup tip design concentrates clamping force on shafts and collars, preventing axial movement without damaging secured components. Combined with Class 3A thread fit and coarse UNC threading, this hex drive set screw ensures rapid installation and reliable holding power in high-stress environments, making it ideal for permanent assemblies requiring minimal maintenance.
Specification Summary & Compliance
This set screw maintains precision Class 3A thread fit per UNC standards with 4-40 thread size and 7/16" length. Manufacturing complies with ASME B18.3 specifications where identified under ASTM F912. The product is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant regarding SVHC substances as of 01/17/2023, ensuring environmental regulatory adherence for global industrial applications.
