S-97345A464 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, ideal for harsh environments and chemical exposure
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for demanding industrial applications
- Precision thread fit with Class 3A UNF fine threads ensuring secure, vibration-resistant fastening in critical assemblies
- Secure installation and removal featuring a knurled socket head with 5/32" hex drive for improved grip and torque application
- Accurate shoulder positioning with controlled diameter and length tolerances for precise component alignment
- High durability backed by Rockwell B79 hardness for long-term performance under repetitive loads
- Regulatory compliance meeting ASME B18.3 standards, RoHS 3, and REACH for global industrial use
Professional Applications & Engineering Value
This 1/4"-28 UNF shoulder screw is engineered to solve critical alignment and strength challenges in precision machinery. The 316 stainless steel construction provides excellent resistance to corrosion and oxidation, making it suitable for marine, chemical processing, and food equipment applications. The Class 3A thread fit and fine UNF threads ensure tight tolerances and vibration resistance in dynamic assemblies, while the knurled socket head allows for secure tool engagement during installation in confined spaces. The precisely machined shoulder maintains component alignment in rotating mechanisms, bearings, and pivoting joints, reducing wear and extending service life in industrial automation and precision engineering systems.
Specification Summary & Compliance
This shoulder screw features Class 3A thread fit with UNF fine thread specifications (1/4"-28), ensuring high precision in threaded connections. Shoulder dimensions include diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for accurate component positioning. Manufacturing and quality comply with ASME B18.3 standards, and the product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
