S-92311A319 4-40 x 1 1/4" ASME B18.3 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 18-8 Stainless Steel construction, ideal for harsh industrial environments
- Exceptional holding power with Class 3A thread fit ensuring tight, secure fastening in demanding applications
- Easy installation and removal thanks to the 0.050" hex drive design that prevents stripping
- Enhanced vibration resistance from the cup point tip that digs into surfaces for reliable, long-term positioning
- Optimized durability with Rockwell B80 hardness providing excellent wear resistance and mechanical strength
- Wide compatibility with coarse UNC threads and right-hand direction for standard industrial use
- Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH for safe, quality-assured performance
Professional Applications & Engineering Value
This 4-40 UNC set screw is engineered to deliver reliable performance in precision assembly and machinery applications. The 18-8 Stainless Steel material offers excellent resistance to rust and corrosion, making it suitable for outdoor, marine, or chemically exposed environments. The headless design with hex drive allows for flush mounting in tight spaces, while the cup point ensures maximum grip on shafts, gears, and collars by creating a permanent indentation. With a coarse thread spacing and Class 3A fit, it provides superior clamping force and reduces the risk of loosening under vibration, commonly encountered in automotive, aerospace, and manufacturing equipment. Its compliance with industry standards ensures consistent quality and interchangeability, reducing downtime and maintenance costs.
Specification Summary & Compliance
This set screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high precision and tight tolerances. The UNC coarse thread (4-40 size) and right-hand direction ensure compatibility with standard components. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances. Manufactured from 18-8 Stainless Steel with a Rockwell B80 hardness, it meets rigorous industrial demands for strength and durability.
