S-90311A167 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
- Secure vibration-resistant locking with permanent nylon patch thread locker that maintains integrity from -50° to 250°F, preventing loosening in dynamic applications
- Superior corrosion resistance through 316 stainless steel construction, ideal for harsh chemical or marine environments
- Precise component alignment with 1-1/2" shoulder length and controlled diameter tolerance for accurate positioning in assemblies
- High mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for demanding industrial applications
- Reliable thread engagement with Class 3A UNC coarse threads ensuring consistent fastening performance
- Easy installation and removal via 5/32" hex socket drive and knurled head for superior tool grip
- Industry compliance assurance meeting ASME B18.3 specifications and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
Engineered for precision industrial applications, this 316 stainless steel shoulder screw solves critical alignment and vibration challenges in machinery assembly. The 1-1/2" shoulder length provides exact component spacing in rotating equipment, while the nylon patch thread locker eliminates maintenance-intensive retightening in vibrating systems. With Class 3A UNC coarse threads, installation is accelerated in production environments without sacrificing joint integrity. The knurled socket head ensures positive tool engagement during high-torque assembly, making it ideal for precision manufacturing equipment, automotive jigs, and conveyor systems where dimensional stability and corrosion resistance are paramount.
Specification Summary & Compliance
This shoulder screw maintains Class 3A thread fit per ASME B18.3 standards with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufacturing complies with ASME B18.3 specifications and demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications.
