S-91375A106 4-40 x 1/4" 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 holding power with Class 3A thread fit ensuring precise, vibration-resistant fastening in demanding applications
- Exceptional durability from Rockwell C45 hardened Black-Oxide Alloy Steel resisting wear and deformation under heavy loads
- Easy installation and removal with hex drive design providing reliable torque transfer and access in confined spaces
- Enhanced corrosion resistance thanks to the black-oxide surface treatment prolonging service life in industrial environments
- Reliable positioning with cup tip design that bites into surfaces to prevent component slippage and migration
- Broad compatibility with UNC coarse threads offering quick assembly and secure fastening in various materials
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations for global supply chain integration
Professional Applications & Engineering Value
This 4-40 UNC set screw delivers critical engineering solutions for industrial applications requiring secure component positioning. The Black-Oxide Alloy Steel construction with Rockwell C45 hardness provides exceptional resistance to vibrational loosening and mechanical stress in machinery, automotive assemblies, and precision equipment. The headless design with hex drive enables flush mounting in space-constrained applications while maintaining high torque capability. With Class 3A thread fit and coarse UNC threads, this fastener ensures rapid installation and reliable performance in high-vibration environments where maintaining alignment is critical. The cup tip creates positive engagement with shafts and collars, preventing rotational slippage in power transmission systems and precision mechanisms.
Specification Summary & Compliance
This set screw features precision 4-40 UNC coarse threads with Class 3A fit for superior dimensional accuracy and thread engagement. Manufactured to ASME B18.3 specifications ensuring consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring restricted substance compliance.
