S-97345A688 3/8"-16 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 long-lasting performance in harsh environments
- Precise component alignment through Class 3A thread fit and controlled shoulder diameter tolerances (-0.004" to -0.002")
- Enhanced torque transmission with knurled socket head and 1/4" hex drive preventing tool slippage
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi minimum shear strength
- Reliable positioning through 1-5/8" shoulder length with tight ±0.005" tolerance for consistent assembly
- Industry-standard compatibility meeting ASME B18.3 specifications for interchangeability and quality assurance
- Environmental compliance with RoHS 3 and REACH regulations for safe use in regulated industries
Professional Applications & Engineering Value
This 316 Stainless Steel shoulder screw delivers exceptional value in precision mechanical assemblies where alignment and corrosion resistance are critical. The 1/2" diameter shoulder with controlled tolerances provides exact bearing surfaces for rotating components in machinery, while the Class 3A UNC thread ensures secure fastening in high-vibration applications. The knurled socket head with hex drive allows for high-torque installation without cam-out, making it ideal for precision equipment, automation systems, and industrial machinery. The combination of 70,000 psi tensile strength and Rockwell B79 hardness provides reliable performance in demanding applications where fastener failure is not an option.
Specification Summary & Compliance
This precision shoulder screw features 3/8"-16 UNC coarse threads with Class 3A fit for superior thread engagement and a 1/2" shoulder diameter with tight tolerance control (-0.004" to -0.002"). Manufacturing complies with ASME B18.3 standards for dimensional accuracy and performance reliability. The fastener is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental regulations for hazardous substance restrictions.
