S-91979A313 4-40 x 3/8" Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
• Exceptional holding power provided by the cup point tip that digs into mating surfaces for secure component positioning
• Precise thread engagement with Class 3A thread fit ensuring tight tolerances and reliable fastening in critical applications
• Easy installation and removal through the hex drive design with 0.050" drive size for efficient assembly operations
• Enhanced functionality with vented feature and 0.035" vent diameter allowing for pressure equalization or fluid passage
• Optimized for industrial use with coarse UNC threads providing quick assembly and resistance to vibration loosening
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

This 4-40 UNC set screw delivers exceptional engineering value in precision assembly applications where reliable component positioning is critical. The 18-8 stainless steel construction provides excellent corrosion resistance, making it ideal for machinery, electronic enclosures, and automotive components exposed to moisture or chemicals. The hex headless design with 0.050" drive size ensures flush mounting while allowing secure tool engagement. The cup point tip creates permanent dimples in mating surfaces, preventing rotational slippage under vibration - a common challenge in industrial settings. The vented feature with 0.035" vent diameter adds versatility for applications requiring pressure relief or fluid management. With Class 3A thread fit and coarse UNC threads, this set screw maintains precise tolerances while enabling rapid assembly in production environments.

Specification Summary & Compliance

This precision fastener features 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. The 3/8" length and right-hand thread direction provide standardized installation compatibility. Manufacturing and material compliance includes full adherence to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety standards are met for industrial applications worldwide.