S-97345A473 1/4"-28 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
- Superior corrosion resistance with 316 stainless steel construction for extended service life in harsh environments
- Precise component alignment through Class 3A thread fit ensuring vibration-resistant, secure fastening
- Enhanced grip and torque application with knurled head and 5/32" hex drive for slip-resistant installation
- High-load bearing capability with 70,000 psi tensile strength for demanding mechanical applications
- Reduced assembly time through standardized UNF fine thread (1/4"-28) design for compatibility with existing systems
- Reliable shoulder positioning with controlled diameter tolerances for accurate component spacing
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for global industrial use
Professional Applications & Engineering Value
Engineered for precision machinery and industrial equipment, these 316 stainless steel shoulder screws provide critical alignment functions in rotating assemblies, pivoting mechanisms, and precision guides. The Class 3A thread fit eliminates play in high-vibration environments, while the UNF fine thread configuration offers superior resistance to loosening under dynamic loads. The knurled socket head ensures positive tool engagement during installation, preventing cam-out in confined spaces. With exceptional corrosion resistance, these fasteners maintain dimensional stability in chemical processing, marine, and food processing equipment where moisture and aggressive media are present. The precision-ground shoulder provides consistent bearing surfaces for gears, pulleys, and linkages, reducing wear and maintenance requirements in automated systems.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit precision tolerances. Features UNF fine thread (1/4"-28) with right-hand orientation and standard shoulder fit. Shoulder diameter maintains -0.004" to -0.002" tolerance with shoulder length tolerance of -0.005" to 0.005". Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Mechanical properties include Rockwell B79 hardness and minimum shear strength of 35,000 psi.
