S-97345A628 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
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
- Exceptional mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for heavy-duty applications
- Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
- Knurled head design provides enhanced grip for manual adjustments and prevents slipping during installation
- Standard hex socket drive allows for high-torque installation with common tools while maintaining clean aesthetics
- ASME B18.3 compliance guarantees dimensional accuracy and interchangeability with industry-standard components
- Environmental regulation compliance with RoHS 3 and REACH standards for global manufacturing acceptability
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw delivers critical performance in precision machinery, automation systems, and rotating assemblies where corrosion resistance and dimensional stability are paramount. The 1/4"-20 UNC coarse thread with Class 3A fit provides secure fastening in soft materials and prevents loosening under vibration, while the knurled socket head facilitates tool-free adjustments in confined spaces. The 3/4" thread length offers sufficient engagement for thick materials, and the precision shoulder diameter acts as an axle or pivot point in mechanical linkages. Engineered to ASME B18.3 specifications, this fastener solves alignment issues in industrial equipment while withstanding corrosive chemicals and saltwater environments that would degrade ordinary fasteners.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 standards with Class 3A thread fit for superior dimensional accuracy. Features include: 1/4"-20 UNC coarse thread, 3/4" thread length, 3/8" shoulder diameter with tight tolerance control, and Rockwell B79 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for unrestricted use in global markets.
