S-90311A169 1/4"-20 ASME B18.3 Shoulder Screws
Shoulder 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
- Vibration-resistant locking with permanent nylon patch that maintains secure fastening from -50° to 250°F
- Superior corrosion resistance through 316 stainless steel construction for harsh industrial environments
- Precision alignment capability with 2" shoulder length providing stable bearing surfaces
- High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength
- Secure hex drive engagement with 5/32" drive size and knurled head for non-slip installation
- Reliable thread integrity with Class 3A fit ensuring precise engagement and consistent performance
- Industry-standard compliance meeting ASME B18.3 specifications for guaranteed interoperability
Professional Applications & Engineering Value
This 1/4"-20 UNC shoulder screw delivers critical engineering solutions where precision alignment and vibration resistance are paramount. The 316 stainless steel construction provides exceptional corrosion resistance in demanding environments including marine, chemical processing, and food equipment applications. The integrated nylon patch thread locker eliminates the need for separate locking components while maintaining secure fastening across extreme temperature ranges (-50° to 250°F). The 2" shoulder length with tight diameter tolerance ensures precise component positioning in assemblies, while the knurled socket head facilitates secure tool engagement during installation. These features combine to solve common industrial challenges including misalignment, vibration-induced loosening, and corrosion-related failure in machinery, automation systems, and precision equipment.
Specification Summary & Compliance
This shoulder screw maintains Class 3A thread fit per UNC standards with precise shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications with Rockwell B79 hardness rating. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
