S-97768A418 3/8"-24 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 black oxide finish on 18-8 stainless steel, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for heavy-duty applications
- Precise thread engagement with Class 3A fit and UNF fine threading ensuring vibration resistance and reliable fastening
- Easy installation and removal with 1/4" hex drive and knurled head for secure tool grip
- Enhanced durability from Rockwell B55 hardness, maintaining performance under repeated stress
- Accurate shoulder positioning with controlled diameter and length tolerances for consistent component alignment
- Compliance with industry standards including ASME B18.3, meeting rigorous engineering specifications
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw with black oxide finish provides critical protection against corrosion in demanding settings like machinery, automotive assemblies, and precision equipment. The Class 3A thread fit and UNF fine threading deliver superior clamping force and vibration resistance, preventing loosening in high-stress applications. The knurled head and hex drive design facilitate quick, secure installation with standard tools, reducing assembly time. With a 70,000 psi tensile strength and controlled shoulder dimensions, it ensures precise alignment of moving parts in pivots, linkages, and rotating mechanisms, enhancing operational reliability and longevity.
Specification Summary & Compliance
This shoulder screw features Class 3A thread fit with UNF 3/8"-24 fine threads, ensuring tight tolerances per ASME B18.3. Shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005" for precise fit. It is manufactured from hardened 18-8 stainless steel and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, guaranteeing safety and regulatory adherence for industrial use.
