S-91375A170 4-40 x 7/8" 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
- Maximum holding power with Class 3A thread fit ensuring precise, vibration-resistant connections in demanding applications
- Superior corrosion resistance from black-oxide coating, extending service life in harsh industrial environments
- High-strength durability with Rockwell C45 hardness, providing reliable performance under heavy mechanical stress
- Secure installation through hex drive design, allowing for high torque application without head interference
- Optimized grip with cup tip configuration, preventing component slippage and maintaining positional accuracy
- Industry-standard compatibility meeting ASME B18.3 specifications for consistent quality and interchangeability
- Environmental compliance with RoHS 3 and REACH regulations, ensuring safe use across global markets
Professional Applications & Engineering Value
This 4-40 UNC set screw delivers exceptional engineering value through its black-oxide alloy steel construction and headless design. The combination of Class 3A thread fit and Rockwell C45 hardness addresses critical industrial challenges including vibration loosening, component misalignment, and mechanical failure in high-stress assemblies. The cup tip configuration provides superior biting action into mating surfaces, while the hex drive enables precise torque control in confined spaces. Ideal for precision machinery, automotive systems, and industrial equipment where reliable fastening performance and corrosion resistance are paramount, this fastener maintains positional integrity through extended service cycles.
Specification Summary & Compliance
This 4-40 UNC set screw features precise Class 3A thread fit tolerances with coarse thread spacing and right-hand thread direction. Manufactured to ASME B18.3 specifications with ASTM F912 compliance, ensuring dimensional accuracy and mechanical reliability. The product fully meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming compliance with international standards for hazardous substance restrictions and chemical safety protocols.
